Subjects -> ENERGY (Total: 414 journals)
    - ELECTRICAL ENERGY (12 journals)
    - ENERGY (252 journals)
    - ENERGY: GENERAL (7 journals)
    - NUCLEAR ENERGY (40 journals)
    - PETROLEUM AND GAS (58 journals)
    - RENEWABLE ENERGY (45 journals)

ENERGY (252 journals)                  1 2 | Last

Showing 1 - 200 of 406 Journals sorted by number of followers
IET Power Electronics     Open Access   (Followers: 76)
Energy Policy     Partially Free   (Followers: 74)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 50)
IEEE Transactions on Power Systems     Hybrid Journal   (Followers: 45)
Energy     Partially Free   (Followers: 40)
IEEE Power and Energy     Full-text available via subscription   (Followers: 36)
Journal of Physical Chemistry C     Hybrid Journal   (Followers: 36)
Solar Energy Materials and Solar Cells     Hybrid Journal   (Followers: 29)
Energy & Fuels     Hybrid Journal   (Followers: 28)
Advances in Natural Sciences : Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Nature Energy     Hybrid Journal   (Followers: 27)
Applied Energy     Partially Free   (Followers: 26)
Energy & Environment     Hybrid Journal   (Followers: 25)
Energy and Power Engineering     Open Access   (Followers: 23)
International Journal of Turbomachinery, Propulsion and Power     Open Access   (Followers: 23)
Advances in High Energy Physics     Open Access   (Followers: 23)
International Journal of Alternative Propulsion     Hybrid Journal   (Followers: 23)
International Journal of Hydrogen Energy     Partially Free   (Followers: 23)
Applied Solar Energy     Hybrid Journal   (Followers: 20)
Water International     Hybrid Journal   (Followers: 19)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 19)
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 19)
Solar Energy     Hybrid Journal   (Followers: 19)
Energy and Power     Open Access   (Followers: 18)
Journal of Solar Energy Engineering     Full-text available via subscription   (Followers: 18)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 18)
Nuclear Engineering and Design     Hybrid Journal   (Followers: 16)
Advances in Energy and Power     Open Access   (Followers: 16)
IEEE Transactions on Energy Conversion     Hybrid Journal   (Followers: 16)
Energy, Sustainability and Society     Open Access   (Followers: 15)
Progress in Energy and Combustion Science     Hybrid Journal   (Followers: 15)
Energy Conversion and Management     Hybrid Journal   (Followers: 15)
International Journal of Thermodynamics     Open Access   (Followers: 15)
Energy Journal The     Hybrid Journal   (Followers: 14)
Energy and Environment Research     Open Access   (Followers: 13)
Surface Science Reports     Full-text available via subscription   (Followers: 13)
Waste Management     Hybrid Journal   (Followers: 13)
Economics and Policy of Energy and the Environment     Full-text available via subscription   (Followers: 13)
Energy and Buildings     Hybrid Journal   (Followers: 12)
International Journal of Sustainable Energy     Hybrid Journal   (Followers: 12)
Biofuels     Hybrid Journal   (Followers: 11)
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 11)
Journal of Solar Energy     Open Access   (Followers: 11)
Advances in Building Energy Research     Hybrid Journal   (Followers: 11)
Energy Research & Social Science     Full-text available via subscription   (Followers: 11)
Oil and Gas Journal     Full-text available via subscription   (Followers: 11)
Energy Systems     Hybrid Journal   (Followers: 11)
Energy Science and Technology     Open Access   (Followers: 10)
Innovations : Technology, Governance, Globalization     Hybrid Journal   (Followers: 10)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Energy Efficiency     Hybrid Journal   (Followers: 10)
IEEE Transactions on Nuclear Science     Hybrid Journal   (Followers: 10)
Archives of Thermodynamics     Open Access   (Followers: 10)
Journal of Ocean and Climate     Open Access   (Followers: 9)
Journal of Modern Power Systems and Clean Energy     Open Access   (Followers: 9)
CERN courier. International journal of high energy physics     Free   (Followers: 8)
Journal of Renewable Energy     Open Access   (Followers: 8)
International Journal of Green Energy     Hybrid Journal   (Followers: 8)
Energy Strategy Reviews     Open Access   (Followers: 8)
International Journal of Electric and Hybrid Vehicles     Hybrid Journal   (Followers: 8)
International Journal of Energy Research     Hybrid Journal   (Followers: 8)
Batteries     Open Access   (Followers: 8)
International Journal of Global Energy Issues     Hybrid Journal   (Followers: 8)
Wiley Interdisciplinary Reviews : Energy and Environment     Hybrid Journal   (Followers: 8)
International Journal of Energy and Power     Open Access   (Followers: 8)
Environmental Progress & Sustainable Energy     Hybrid Journal   (Followers: 7)
Energy and Environment Focus     Free   (Followers: 7)
Applied Nanoscience     Open Access   (Followers: 7)
American Journal of Energy Research     Open Access   (Followers: 7)
Annals of Nuclear Energy     Hybrid Journal   (Followers: 7)
Fuel and Energy Abstracts     Full-text available via subscription   (Followers: 7)
Materials for Renewable and Sustainable Energy     Open Access   (Followers: 6)
Structural Control and Health Monitoring     Hybrid Journal   (Followers: 6)
Energy Prices and Taxes     Full-text available via subscription   (Followers: 6)
Energy Science & Engineering     Open Access   (Followers: 6)
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 5)
Joule     Hybrid Journal   (Followers: 5)
Computational Water, Energy, and Environmental Engineering     Open Access   (Followers: 5)
Energy Studies Review     Open Access   (Followers: 5)
Energy and Environmental Engineering     Open Access   (Followers: 5)
Energy Technology     Partially Free   (Followers: 5)
Journal of Energy & Natural Resources Law     Hybrid Journal   (Followers: 5)
Geothermal Energy     Open Access   (Followers: 5)
Frontiers in Energy Research     Open Access   (Followers: 5)
International Journal of Sustainable Energy Planning and Management     Open Access   (Followers: 5)
Batteries & Supercaps     Hybrid Journal   (Followers: 5)
Atomic Energy     Hybrid Journal   (Followers: 5)
Energy Reports     Open Access   (Followers: 5)
ACS Applied Energy Materials     Hybrid Journal   (Followers: 5)
Journal of Energy Technologies and Policy     Open Access   (Followers: 5)
Energy Storage Materials     Full-text available via subscription   (Followers: 5)
Carbon Management     Hybrid Journal   (Followers: 5)
Journal of Nano Energy and Power Research     Full-text available via subscription   (Followers: 4)
International Journal of Nuclear Energy Science and Technology     Hybrid Journal   (Followers: 4)
International Journal of Applied Power Engineering     Open Access   (Followers: 4)
Journal of International Energy Policy     Open Access   (Followers: 4)
Journal of Energy Storage     Full-text available via subscription   (Followers: 4)
Journal of Photochemistry and Photobiology B: Biology     Hybrid Journal   (Followers: 4)
ACS Energy Letters     Hybrid Journal   (Followers: 4)
Journal of Energy, Environment & Carbon Credits     Full-text available via subscription   (Followers: 4)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 4)
Development of Energy Science     Open Access   (Followers: 4)
Foundations and Trends® in Renewable Energy     Full-text available via subscription   (Followers: 4)
Strategic Planning for Energy and the Environment     Hybrid Journal   (Followers: 4)
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 4)
Frontiers in Energy     Hybrid Journal   (Followers: 4)
Sustainable Energy, Grids and Networks     Hybrid Journal   (Followers: 4)
American Journal of Energy and Environment     Open Access   (Followers: 4)
Journal of Ocean Engineering and Marine Energy     Hybrid Journal   (Followers: 3)
Dams and Reservoirs     Hybrid Journal   (Followers: 3)
Functional Materials Letters     Hybrid Journal   (Followers: 3)
Journal of Energy, Mechanical, Material and Manufacturing Engineering     Open Access   (Followers: 3)
Protection and Control of Modern Power Systems     Open Access   (Followers: 3)
International Journal of Energy and Statistics     Hybrid Journal   (Followers: 3)
Journal of Photochemistry and Photobiology C: Photochemistry Reviews     Full-text available via subscription   (Followers: 3)
Distributed Generation & Alternative Energy Journal     Hybrid Journal   (Followers: 3)
Wind Energy     Hybrid Journal   (Followers: 3)
Science and Technology of Nuclear Installations     Open Access   (Followers: 3)
Energy and Emission Control Technologies     Open Access   (Followers: 3)
Power Technology and Engineering     Hybrid Journal   (Followers: 3)
International Journal of Energy and Environmental Engineering     Open Access   (Followers: 3)
Journal of Energy Chemistry     Full-text available via subscription   (Followers: 3)
Science and Technology for Energy Transition     Open Access   (Followers: 3)
Journal of Photochemistry and Photobiology A: Chemistry     Hybrid Journal   (Followers: 3)
International Journal of Smart Grid and Green Communications     Hybrid Journal   (Followers: 2)
IET Smart Grid     Open Access   (Followers: 2)
International Journal of Coal Science & Technology     Open Access   (Followers: 2)
Energy Technology & Policy     Open Access   (Followers: 2)
Journal of Technology Innovations in Renewable Energy     Hybrid Journal   (Followers: 2)
Clean Energy     Open Access   (Followers: 2)
Materials Today Energy     Hybrid Journal   (Followers: 2)
Green Energy & Environment     Open Access   (Followers: 2)
Journal of Power and Energy Engineering     Open Access   (Followers: 2)
Sustainable Energy     Open Access   (Followers: 2)
Carbon Resources Conversion     Open Access   (Followers: 2)
Energy Storage     Hybrid Journal   (Followers: 2)
Advanced Materials Technologies     Hybrid Journal   (Followers: 2)
Proceedings of the Institution of Civil Engineers - Energy     Hybrid Journal   (Followers: 2)
Journal of Energy in Southern Africa     Open Access   (Followers: 2)
Journal of Energy     Open Access   (Followers: 2)
EPJ Photovoltaics     Open Access   (Followers: 2)
International Journal of Clean Coal and Energy     Open Access   (Followers: 2)
Progress in Nuclear Energy     Hybrid Journal   (Followers: 2)
Journal of Alternate Energy Sources & Technologies     Full-text available via subscription   (Followers: 2)
Journal of Nuclear Energy Science & Power Generation Technology     Hybrid Journal   (Followers: 2)
Journal of Fusion Energy     Hybrid Journal   (Followers: 2)
International Journal of Nuclear Knowledge Management     Hybrid Journal   (Followers: 2)
Gcb Bioenergy     Open Access   (Followers: 2)
International Journal of Nuclear Hydrogen Production and Applications     Hybrid Journal   (Followers: 1)
Clean Technologies     Open Access   (Followers: 1)
Sustainable Energy & Fuels     Hybrid Journal   (Followers: 1)
Radioprotection     Hybrid Journal   (Followers: 1)
Electricity Journal     Hybrid Journal   (Followers: 1)
Energy Conversion and Management : X     Open Access   (Followers: 1)
International Journal of Energy and Smart Grid     Open Access   (Followers: 1)
International Journal of Power and Energy Conversion     Hybrid Journal   (Followers: 1)
Clefs CEA     Full-text available via subscription   (Followers: 1)
Journal of Computational Multiphase Flows     Open Access   (Followers: 1)
IET Energy Systems Integration     Open Access   (Followers: 1)
Nigerian Journal of Technological Research     Full-text available via subscription   (Followers: 1)
Biofuel Research Journal     Open Access   (Followers: 1)
International Journal of Nuclear Desalination     Hybrid Journal   (Followers: 1)
Technology Audit and Production Reserves     Open Access   (Followers: 1)
Michigan Journal of Sustainability     Open Access   (Followers: 1)
Open Journal of Energy Efficiency     Open Access   (Followers: 1)
Asian Bulletin of Energy Economics and Technology     Open Access   (Followers: 1)
International Journal of Energy and Water Resources     Hybrid Journal  
BioPhysical Economics and Resource Quality     Hybrid Journal  
Geomechanics and Geophysics for Geo-Energy and Geo-Resources     Hybrid Journal  
Energy, Ecology and Environment     Hybrid Journal  
Technology and Economics of Smart Grids and Sustainable Energy     Hybrid Journal  
BMC Energy     Open Access  
Journal of Energy and Environment Technology of Graduate School Siam Technology College     Open Access  
Global Energy Interconnection     Open Access  
Journal of Energy Systems     Open Access  
International Journal of Energy & Engineering Sciences     Open Access  
Turkish Journal of Energy Policy     Open Access  
Energy Informatics     Open Access  
Global Challenges     Open Access  
High Voltage     Open Access  
Geomechanics for Energy and the Environment     Full-text available via subscription  
ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations     Open Access  
Sustainable Energy Technologies and Assessments     Full-text available via subscription  
Journal of China Coal Society     Open Access  
Facta Universitatis, Series : Electronics and Energetics     Open Access  
Universal Journal of Applied Science     Open Access  
Ingeniería Energética     Open Access  
E3S Web of Conferences     Open Access  
Washington and Lee Journal of Energy, Climate, and the Environment     Open Access  
Journal of Sustainable Bioenergy Systems     Full-text available via subscription  
International Journal of Ambient Energy     Hybrid Journal  
CT&F - Ciencia, Tecnología y Futuro     Open Access  
Multequina     Open Access  
Natural Resources     Open Access  
South Pacific Journal of Natural and Applied Sciences     Hybrid Journal  
Chain Reaction     Full-text available via subscription  
Wind Engineering     Hybrid Journal  
Nuclear Data Sheets     Full-text available via subscription  
Global Energy Law and Sustainability     Hybrid Journal  
International Journal of Nuclear Governance, Economy and Ecology     Hybrid Journal  

        1 2 | Last

Similar Journals
Journal Cover
International Journal of Turbomachinery, Propulsion and Power
Number of Followers: 23  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2504-186X
Published by MDPI Homepage  [84 journals]
  • IJTPP, Vol. 7, Pages 12: Flow in Pillow-Plate Channels for High-Speed
           Turbomachinery Heat Exchangers

    • Authors: Stephan Sundermeier, Maximilian Passmann, Stefan aus der Wiesche, Eugeny Y. Kenig
      First page: 12
      Abstract: In numerous turbomachinery applications, e.g., in aero-engines with regenerators for improving specific fuel consumption (SFC), heat exchangers with low-pressure loss are required. Pil low-plate heat exchangers (PPHE) are a novel exchanger type and promising candidates for high-speed flow applications due to their smooth profiles avoiding blunt obstacles in the flow path. This work deals with the overall system behavior and gas dynamics of pillow-plate channels. A pillow-plate channel was placed in the test section of a blow-down wind tunnel working with dry air, and compressible flow phenomena were investigated utilizing conventional and focusing schlieren optics; furthermore, static and total pressure measurements were performed. The experiments supported the assumption that the system behavior can be described through a Fanno–Rayleigh flow model. Since only wavy walls with smooth profiles were involved, linearized gas dynamics was able to cover important flow features within the channel. The effects of the wavy wall structures on pressure drop and Mach number distribution within the flow path were investigated, and a good qualitative agreement with theoretical and numerical predictions was found. The present analysis demonstrates that pressure losses in pillow-plate heat exchangers are rather low, although their strong turbulent mixing enables high convective heat transfer coefficients.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-03-22
      DOI: 10.3390/ijtpp7020012
      Issue No: Vol. 7, No. 2 (2022)
       
  • IJTPP, Vol. 7, Pages 13: Two-Dimensional Investigation of the Fundamentals
           of OGV Buffeting

    • Authors: Jonah Harris, Bharat Lad, Sina Stapelfeldt
      First page: 13
      Abstract: The increased demands of compact modern aero engine architectures have highlighted the problem of outlet guide vane (OGV) buffeting in off-design conditions. This structural response to aerodynamic excitations is characterised by increased vibration, risking structural fatigue. Investigations focused on understanding, mitigation and avoidance are therefore of high priority. OGV buffet is a type of transonic buffet caused by unsteady shock movement, but the exact parameters driving it are not fully understood. To try and understand them, this paper examines the buffet of a quasi-2D OGV geometry. Parametric studies of the incidence angle and inlet Mach number were performed. Forcing frequencies for both studies were found to be close to the experimentally detected frequency of vibration in the first bow mode, which demonstrates that buffet is driven by quasi-2D flow features. Increasing the inlet Mach number increased the dominant forcing frequency, whereas increasing the incidence yielded little change. Profiles of unsteady pressure amplitudes were shown to smoothly increase in magnitude with an increasing incidence and inlet Mach number.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-04-02
      DOI: 10.3390/ijtpp7020013
      Issue No: Vol. 7, No. 2 (2022)
       
  • IJTPP, Vol. 7, Pages 14: A Reliable Update of the Ainley and Mathieson
           Profile and Secondary Correlations

    • Authors: Yumin Liu, Patrick Hendrick, Zhengping Zou, Frank Buysschaert
      First page: 14
      Abstract: Empirical correlations are still fundamental in the modern design paradigm of axial turbines. Among these, the prominent Ainley and Mathieson correlation (Ainley D. and Mathieson G., 1951, “A Method of Performance Estimation for Axial-Flow Turbines,” ARC Reports and Memoranda No. 2974) and its derivatives, plays a crucial role. In this paper, the underlying assumptions of the aforementioned models are discussed by means of a descriptive review, whilst an attempt is made to enhance their reliability and, potentially, accuracy in performance estimations. Closer investigation reveals an intriguing misuse of the lift coefficient in the secondary loss. In light of this, an enhanced model that, notably, builds upon the Zweifel criterion and the vortex penetration depth concept is developed and discussed. The obtained accuracy is subsequently assessed through CFD computations, employing a database comprising 109 cascades. The results indicate a 50% probability of achieving the ±15% error interval, which is twice as good as the most recent Aungier model (Aungier R., 2006, “Turbine Aerodynamics: Axial-Flow and Radial-Inflow Turbine Design and Analysis”, ASME Press, New York). Furthermore, the reliability of the proposed model is demonstrated by a reconstruction of the Smith chart, on the one hand, and a performance analysis, on the other. The reconstruction exhibits contours that conform to the original. The results of the performance study are compared with the CFD solutions of eight cascades working in off design conditions and confirm the need of the additionally included turbine design parameters, such as the axial velocity and the meanline radius ratios.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-04-21
      DOI: 10.3390/ijtpp7020014
      Issue No: Vol. 7, No. 2 (2022)
       
  • IJTPP, Vol. 7, Pages 15: Acoustoelastic Modes in Rotor-Cavity Systems: An
           Overview on Frequency Shift Effects Supported with Measurements

    • Authors: Unglaube, Brillert
      First page: 15
      Abstract: With an increase in fluid densities in centrifugal compressors, fluid-structure interaction and coupled acoustoelastic modes receive growing attention to avoid machine failure. Besides the vibrational behavior of the impeller, acoustic modes building up in the side cavities need to be understood to ensure safe and reliable operation. In a coupled system, these structure and acoustic dominant modes influence each other. Therefore, a comprehensive overview of frequency shift effects in rotor-cavity systems is established based on findings in the literature. Additionally, experimental results on coupled mode pairs in a rotor-cavity test rig with a rotating disk under varying operating conditions are presented. Measurement results for structure dominant modes agree well with theoretical predictions. The development of a forward and a backward traveling wave is demonstrated for each mode in case of disk rotation. Conducted experiments reveal the occurrence of weakly and strongly coupled mode pairs as frequency shifts are observed that cannot solely be explained by “uncoupled mode effects”, such as the added mass, speed of sound, and stiffening effect, but indicate an additional coupling effect. However, the hypothesis of a bigger frequency shift for stronger coupled modes cannot be corroborated consistently. Only for the strongly coupled four nodal diameter mode pair in the “wide cavity” setup, a coupling effect is clearly visible in the form of mode veering.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-05-06
      DOI: 10.3390/ijtpp7020015
      Issue No: Vol. 7, No. 2 (2022)
       
  • IJTPP, Vol. 7, Pages 16: Machine Learning Methods in CFD for
           Turbomachinery: A Review

    • Authors: James Hammond, Nick Pepper, Francesco Montomoli, Vittorio Michelassi
      First page: 16
      Abstract: Computational Fluid Dynamics is one of the most relied upon tools in the design and analysis of components in turbomachines. From the propulsion fan at the inlet, through the compressor and combustion sections, to the turbines at the outlet, CFD is used to perform fluid flow and heat transfer analyses to help designers extract the highest performance out of each component. In some cases, such as the design point performance of the axial compressor, current methods are capable of delivering good predictive accuracy. However, many areas require improved methods to give reliable predictions in order for the relevant design spaces to be further explored with confidence. This paper illustrates recent developments in CFD for turbomachinery which make use of machine learning techniques to augment prediction accuracy, speed up prediction times, analyse and manage uncertainty and reconcile simulations with available data. Such techniques facilitate faster and more robust searches of the design space, with or without the help of optimization methods, and enable innovative designs which keep pace with the demand for improved efficiency and sustainability as well as parts and asset operation cost reduction.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-05-13
      DOI: 10.3390/ijtpp7020016
      Issue No: Vol. 7, No. 2 (2022)
       
  • IJTPP, Vol. 7, Pages 17: UHBR Open-Test-Case Fan ECL5/CATANA

    • Authors: Valdo Pagès, Pierre Duquesne, Stéphane Aubert, Laurent Blanc, Pascal Ferrand, Xavier Ottavy, Christoph Brandstetter
      First page: 17
      Abstract: The application of composite fans enables disruptive design possibilities but increases sensitivity to multi-physical resonance between aerodynamic, structure dynamic and acoustic phenomena. As a result, aeroelastic problems increasingly set the stability limit. Test cases of representative geometries without industrial restrictions are a key element of an open scientific culture but are currently non-existent in the turbomachinery community. In order to provide a multi-physical validation benchmark representative of near-future UHBR fan concepts, the open-test-case fan stage ECL5 was developed at Ecole Centrale de Lyon. The design intention was to develop a geometry with high efficiency and a wide stability range that can be realized using carbon fibre composites. This publication aims to introduce the final test case, which is currently fabricated and will be experimentally tested. The fan blades are composed of a laminate made of unidirectional carbon fibres and epoxy composite plies. Their structural properties and the ply orientations are presented. To characterize the test case, details are given on the aerodynamic design of the whole stage, structure dynamics of the fan and aeroelastic stability of the fan. These are obtained with a state-of-art industrial design process: static and modal FEM, RANS and LRANS simulations. Aerodynamic analysis focuses on performance and shows critical flow structures such as tip leakage flow, radial flow migration and flow separations. Mechanical modes of the fan are described and discussed in the context of aeroelastic interactions. Their frequency distribution is validated in terms of resonance risk with respect to synchronous vibration. The aeroelastic stability of the fan is evaluated at representative operating points with a systematic approach. Potential instabilities are observed far from the operating line and do not compromise experimental campaigns.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-05-31
      DOI: 10.3390/ijtpp7020017
      Issue No: Vol. 7, No. 2 (2022)
       
  • IJTPP, Vol. 7, Pages 18: Turbomachine Operation with Magnetic Bearings in
           Supercritical Carbon Dioxide Environment

    • Authors: Alexander Johannes Hacks, Dieter Brillert
      First page: 18
      Abstract: In the sCO2-HeRo project, the Chair of Turbomachinery at the University of Duisburg-Essen developed, built and tested a turbomachine with an integral design in which the compressor, generator and turbine are housed in a single hermetic casing. However, ball bearings limited operation because their lubricants were incompatible with supercritical CO2 (sCO2) and they had to operate in gaseous CO2 instead. To overcome this problem, the turbomachine was redesigned built and tested in the sCO2-4-NPP project. Instead of ball bearings, magnetic bearings are now used to operate the turbomachine with the entire rotor in sCO2. This paper presents the revised design, focusing on the usage of magnetic bearings. It also investigates whether the sCO2 limits the operating range. Test runs show that increasing the density and rotational speed results in greater deflection of the rotor and greater forces on the bearings. Measurements are also analyzed with respect to influence of the density increase on the destabilizing forces in the rotor–stator cavities. The conclusion is that for the operation of the turbomachine, the control parameters of the magnetic bearings must be adjusted not only to the rotor speed, but also to the fluid density. This enabled successful operation of the turbomachine, which reached a speed of about 40,000 rpm during initial tests in CO2.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-06-14
      DOI: 10.3390/ijtpp7020018
      Issue No: Vol. 7, No. 2 (2022)
       
  • IJTPP, Vol. 7, Pages 1: Design and Parametric Analysis of a Supersonic
           Turbine for Rotating Detonation Engine Applications

    • Authors: Noraiz Mushtaq, Gabriele Colella, Paolo Gaetani
      First page: 1
      Abstract: Pressure gain combustion is a promising alternative to conventional gas turbine technologies and within this class the Rotating Detonation Engine has the greatest potential. The Fickett–Jacobs cycle can theoretically increase the efficiency by 15% for medium pressure ratios, but the combustion chamber delivers a strongly non-uniform flow; in these conditions, conventionally designed turbines are inadequate with an efficiency below 30%. In this paper, an original mean-line code was developed to perform an advanced preliminary design of a supersonic turbine; self-starting capability of the supersonic channel has been verified through Kantrowitz and Donaldson theory; the design of the supersonic profile was carried out employing the Method of Characteristics; an accurate evaluation of the aerodynamic losses has been achieved by considering shock waves, profile, and mixing losses. Afterwards, an automated Computational Fluid Dynamics (CFD) based optimization process was developed to find the optimal loading condition that minimizes losses while delivering a sufficiently uniform flow at outlet. Finally, a novel parametric analysis was performed considering the effect of inlet angle, Mach number, reaction degree, peripheral velocity, and blade height ratio on the turbine stage performance. This analysis has revealed for the first time, in authors knowledge, that this type of machines can achieve efficiencies over 70%.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-01-04
      DOI: 10.3390/ijtpp7010001
      Issue No: Vol. 7, No. 1 (2022)
       
  • IJTPP, Vol. 7, Pages 2: Preliminary Design Guidelines for Considering the
           Vibration and Noise of Low-Speed Axial Fans Due to Profile Vortex Shedding
           

    • Authors: Gábor Daku, János Vad
      First page: 2
      Abstract: This paper presents a critical overview on worst-case design scenarios for which low-speed axial flow fans may exhibit an increased risk of blade resonance due to profile vortex shedding. To set up a design example, a circular-arc-cambered plate of 8% relative curvature is investigated in twofold approaches of blade mechanics and aerodynamics. For these purposes, the frequency of the first bending mode of a plate of arbitrary circular camber is expressed by modeling the fan blade as a cantilever beam. Furthermore, an iterative blade design method is developed for checking the risky scenarios for which spanwise and spatially coherent shed vortices, stimulating pronounced vibration and noise, may occur. Coupling these two approaches, cases for vortex-induced blade resonance are set up. Opposing this basis, design guidelines are elaborated upon for avoiding such resonance. Based on the approach presented herein, guidelines are also developed for moderating the annoyance due to the vortex shedding noise.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-01-07
      DOI: 10.3390/ijtpp7010002
      Issue No: Vol. 7, No. 1 (2022)
       
  • IJTPP, Vol. 7, Pages 3: Retrofittable Solutions Capability for Gas Turbine
           Compressors

    • Authors: Martina Ricci, Stefano Gino Mosele, Marcello Benvenuto, Pio Astrua, Roberto Pacciani, Michele Marconcini
      First page: 3
      Abstract: The increasing introduction of renewable energy capacity has changed the perspective on the operation of conventional power plants, introducing the necessity of reaching extreme off-design conditions. There is a strong interest in the development and optimization of technologies that can be retrofitted to an existing power plant to enhance flexibility as well as increase performance and lower emissions. Under the framework of the European project TURBO-REFLEX, a typical F-class gas turbine compressor designed and manufactured by Ansaldo Energia has been studied. Numerical analyses were performed using the TRAF code, which is a state-of-the-art 3D CFD RANS/URANS flow solver. In order to assess the feasibility of lower minimum environmental load operation, by utilizing a reduction in the compressor outlet mass-flow rate, with a safe stability margin, two different solutions have been analyzed: blow-off extractions and extra-closure of Variable Inlet Guide Vanes. The numerical steady-state results are compared and discussed in relation to an experimental campaign, which was performed by Ansaldo Energia. The purpose is to identify the feasibility of the technologies and implementation opportunity in the existing thermal power plant fleet.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-01-11
      DOI: 10.3390/ijtpp7010003
      Issue No: Vol. 7, No. 1 (2022)
       
  • IJTPP, Vol. 7, Pages 4: Acknowledgment to Reviewers of IJTPP in 2021

    • Authors: IJTPP Editorial Office IJTPP Editorial Office
      First page: 4
      Abstract: Rigorous peer-reviews are the basis of high-quality academic publishing [...]
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-01-31
      DOI: 10.3390/ijtpp7010004
      Issue No: Vol. 7, No. 1 (2022)
       
  • IJTPP, Vol. 7, Pages 5: A Low Order Flow Network Model for Double-Wall
           Effusion Cooling Systems

    • Authors: van de Noort, Ireland
      First page: 5
      Abstract: The high pressure turbine nozzle guide vane of a modern aeroengine experiences large heat loads and thus requires both highly effective internal and external cooling. This can be accomplished with double-wall effusion cooling, which combines impingement, pin-fin and effusion cooling. The combination of three cooling mechanisms causes high pressure losses, increasing potential for the migration of coolant towards low pressure regions, subsequently starving effusion holes on the leading edge of coolant supply. This paper presents a low order flow network model to rapidly assess the pressure and mass flow distributions through such cooling schemes for a flexible set of geometric and flow conditions. The model is subsequently validated by a series of experiments with varying mainstream pressure gradients. Results from the model are used to indicate design parameters to reduce the effect of coolant migration, and to minimise the risk of destructive hot gas ingestion.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-02-02
      DOI: 10.3390/ijtpp7010005
      Issue No: Vol. 7, No. 1 (2022)
       
  • IJTPP, Vol. 7, Pages 6: Trapped Acoustic Modes in an Axial Multi-Stage
           Compressor Leading to Non-Synchronous Blade Vibrations

    • Authors: Anne-Lise Fiquet, Stéphane Aubert, Nicolas Buffaz, Agathe Vercoutter, Christoph Brandstetter
      First page: 6
      Abstract: Non-synchronous blade vibrations have been observed in an experimental multi-stage high-speed compressor setup at part-speed conditions. A detailed numerical study has been carried out to understand the observed phenomenon by performing unsteady full-annulus Reynolds-Averaged Navier–Stokes (RANS) simulations of the whole setup using the solver elsA. Several operating conditions have been simulated to observe this kind of phenomena along a speedline of interest. Based on the simulation results, the physical source of the non-synchronous blade vibration is identified: An aerodynamic disturbance appears in a highly loaded downstream rotor and excites a spinning acoustic mode. A “lock-in” phenomenon occurs between the blade boundary layer oscillations and the spinning acoustic mode. The establishment of axially propagating acoustic waves can lead to a complex coupling mechanism and this phenomenon is highly relevant in understanding the multi-physical interactions appearing in modern compressors. It is shown that aerodynamic disturbances occurring downstream can lead to critical excitation of rotor blades in upstream stages due to an axially propagating acoustic wave. The paper includes the analysis of a relevant transient test and a detailed analysis of the numerical results. The study shows the capability and necessity of a full-annulus multistage simulation to understand the phenomenon.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-02-04
      DOI: 10.3390/ijtpp7010006
      Issue No: Vol. 7, No. 1 (2022)
       
  • IJTPP, Vol. 7, Pages 7: Aeroelastic Stability of Combined Plunge-Pitch
           Mode Shapes in a Linear Compressor Cascade

    • Authors: George Hill, Julian Gambel, Sabine Schneider, Dieter Peitsch, Sina Stapelfeldt
      First page: 7
      Abstract: Modern aeroengine designs strive for peak specific fuel and thermal efficiency. To achieve these goals, engines have more highly loaded compressor stages, thinner aerofoils, and blended titanium integrated disks (blisks) to reduce weight. These configurations promote the occurrence of aeroelastic phenomena such as flutter. Two important parameters known to influence flutter stability are the reduced frequency and the ratio of plunge and pitch components in a combined flap mode shape. These are used as design criteria in the engine development process. However, the limit of these criteria is not fully understood. The following research aims to bridge the gap between semi-analytical models and modern compressors by systematically investigating the flutter stability of a linear compressor cascade. This paper introduces the plunge-to-pitch incidence ratio, which is defined as a function of reduced frequency and pitch axis setback for a first flap (1F) mode shape. Using numerical simulations, in addition to experimental validation, aerodynamic damping is computed for many modes to build stability maps. The results confirm the importance of these two parameters in compressor aeroelastic stability as well as demonstrate the significance of the plunge-to-pitch incidence ratio for predicting the flutter limit.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-02-14
      DOI: 10.3390/ijtpp7010007
      Issue No: Vol. 7, No. 1 (2022)
       
  • IJTPP, Vol. 7, Pages 8: Reynolds Sensitivity of the Wake Passing Effect on
           a LPT Cascade Using Spectral/hp Element Methods†

    • Authors: Andrea Cassinelli, Andrés Mateo Mateo Gabín, Francesco Montomoli, Paolo Adami, Raul Vázquez Vázquez Díaz, Spencer J. Sherwin
      First page: 8
      Abstract: Reynolds-Averaged Navier–Stokes (RANS) methods continue to be the backbone of CFD-based design; however, the recent development of high-order unstructured solvers and meshing algorithms, combined with the lowering cost of HPC infrastructures, has the potential to allow for the introduction of high-fidelity simulations in the design loop, taking the role of a virtual wind tunnel. Extensive validation and verification is required over a broad design space. This is challenging for a number of reasons, including the range of operating conditions, the complexity of industrial geometries and their relative motion. A representative industrial low pressure turbine (LPT) cascade subject to wake passing interactions is analysed, adopting the incompressible Navier–Stokes solver implemented in the spectral/hp element framework Nektar++. The bar passing effect is modelled by leveraging a spectral-element/Fourier Smoothed Profile Method. The Reynolds sensitivity is analysed, focusing in detail on the dynamics of the separation bubble on the suction surface as well as the mean flow properties, wake profiles and loss estimations. The main findings are compared with experimental data, showing agreement in the prediction of wake traverses and losses across the entire range of flow regimes, the latter within 5% of the experimental measurements.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-02-22
      DOI: 10.3390/ijtpp7010008
      Issue No: Vol. 7, No. 1 (2022)
       
  • IJTPP, Vol. 7, Pages 9: Experimental Validation of an Analytical
           Condensation Model for Application in Steam Turbine Design

    • Authors: Lapp, Schuster, Hecker, Brillert
      First page: 9
      Abstract: This paper presents experimental data on shear-stress-driven liquid water films on a horizontal plate formed by the condensation of superheated steam. The experimental results were obtained in the Experimental Multi-phase Measurement Application (EMMA) at the University of Duisburg-Essen. The liquid film thickness was spatially and temporally investigated with an optical measurement system. Furthermore, the resulting local heat transfer coefficient in the case of film condensation was determined for a variety of steam velocities and temperatures. Subsequently, the presented data are compared to the results of an analytical condensation model for shear-stress-driven liquid films developed by Cess and Koh. Thus, the model is qualitatively validated, with explicable remaining disparities between the model and experiment that are further discussed. The presented results are an important contribution to the contemporary research into steady-state, single-component multiphase flow considering phase-change phenomena including heat transfer.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-03-03
      DOI: 10.3390/ijtpp7010009
      Issue No: Vol. 7, No. 1 (2022)
       
  • IJTPP, Vol. 7, Pages 10: Stall Margin Improvement in an Axial Compressor
           by Continuous and Pulsed Tip Injection

    • Authors: Joseph Moubogha Moubogha, Gabriel Margalida, Pierric Joseph, Olivier Roussette, Antoine Dazin
      First page: 10
      Abstract: Stall and surge are strong limitations in the operating range of compressors and thus one of the major limits of jet engine performance. A promising way to push the stability limit of compression machines is to inject a small amount of flow at the blade tip to alter the physical mechanism responsible for stall onset. This study focuses on the experimental performance of such a system. To do so, an axial compressor test bench was equipped with 40 actuators connected to an auxiliary pressurised air supply system. They were able to generate high-speed jet blowing just at the tip of the rotor blades. The opening of each actuator was controlled by an electromagnetic valve. This allowed generating continuous or pulsed jets with frequencies up to 500 Hz at different duty cycles. The performance of the control system was investigated for various control strategies, where the injected flow rate, the injection angle, the number of injectors, the jet frequency and the duty cycle were systematically varied. This paper is concluded by a study of the energy balance of the system for various configurations. To the best of the authors’ knowledge, this constitutes a rarely seen analysis in the literature.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-03-16
      DOI: 10.3390/ijtpp7010010
      Issue No: Vol. 7, No. 1 (2022)
       
  • IJTPP, Vol. 7, Pages 11: The Profile Loss of Additive Manufactured Blades
           for Organic Rankine Cycle Turbines

    • Authors: Leander Hake, Felix Reinker, Robert Wagner, Stefan aus der Wiesche, Markus Schatz
      First page: 11
      Abstract: Results from an experimental profile loss study are presented of an additive manufactured linear turbine cascade placed in the test section of a closed-loop organic vapor wind tunnel. This test facility at Muenster University of Applied Sciences allows the investigation of high subsonic and transonic organic vapor flows under ORC turbine flow conditions at elevated pressure and temperature levels. An airfoil from the open literature was chosen for the cascade, and the organic vapor was Novec 649TM. Pitot probes measured the flow field upstream and downstream of the cascade. The inflow turbulence level was 0.5%. The roughness parameters of the metal-printed blades were determined, and the first set of flow measurements was performed. Then, the blade surfaces were further finished, and the impact of roughness on profile losses was assessed in the second flow measurement set. Although the Reynolds number level was relatively high, further surface treatment reduces the profile loss noticeably in organic vapor flows through the printed cascade.
      Citation: International Journal of Turbomachinery, Propulsion and Power
      PubDate: 2022-03-21
      DOI: 10.3390/ijtpp7010011
      Issue No: Vol. 7, No. 1 (2022)
       
 
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