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Publisher: Springer-Verlag   (Total: 2341 journals)

 Arabian Journal for Science and Engineering   [SJR: 0.345]   [H-I: 20]   [5 followers]  Follow         Hybrid journal (It can contain Open Access articles)    ISSN (Print) 1319-8025    Published by Springer-Verlag  [2341 journals]
• Destruction of Static $$\hbox {CO}_{2}$$ CO 2 -Flooded Crude Oil Foams by
Ultrasonic Vibration
• Authors: Lili Zuo; Xiaokai Xing; Yue Zhang; Chunbo Feng
Pages: 1679 - 1685
Abstract: Abstract Destruction of crude oil foams is a key step in efficient crude oil separation, accurate measurement and safe delivery (especially of gas-flooded crude oil, such as $$\hbox {CO}_{2}$$ flooding crude oil). In this study, a patented experimental ultrasonic de-foaming device was used. Using $$\hbox {CO}_{2}$$ -flooded crude oil from the Jilin Oilfield of China, the influence of ultrasonic frequency, ultrasonic power and initial oil pressure and temperature on the destruction of crude oil foams was examined. Ultrasound was shown to accelerate de-foaming of $$\hbox {CO}_{2}$$ -flooded crude oil foams. Under the experimental conditions, as the ultrasonic power increased, oil de-foaming time decreased, and 400 W was determined to be an optimum power for rapid and complete de-foaming. Within an ultrasonic frequency range of 20–80 kHz, 40 kHz was determined to be an optimal de-foaming frequency that minimized de-foaming time. As the initial crude oil pressure and temperature increased, the de-foaming time of $$\hbox {CO}_{2}$$ -flooded crude oil foams decreased.
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2277-1
Issue No: Vol. 42, No. 5 (2017)

• Dynamic Parameter-Integrated Identification of Cabin System for Heavy
Truck
• Authors: Leilei Zhao; Changcheng Zhou; Yuewei Yu; Fuxing Yang
Pages: 1699 - 1706
Abstract: Abstract The main aim of this work was to provide a convenient method to gain the dynamic parameters of a type of cabin system with an acceptable accuracy quickly and efficiently. To start this research, the vibration equations of a 3-DOF cabin model for a heavy truck were built. To retrieve the values of the dynamic parameters, a quadratic error vector function was presented, and the multi-island genetic algorithm was adopted to solve this problem. With a practical example, based on the collected signals, the dynamic parameter-integrated identification was carried out, and the results show that the stability of the solving algorithm for the integrated identification is very well, and the identified values of the model parameters are reliable. In the end, the experimental research was conducted, and the identified values were compared with the tested and those obtained by other methods. The results further prove that the integrated identification method of the dynamic parameters is feasible. This method is particularly suitable for the condition that the dynamic parameters are all unknown.
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2267-3
Issue No: Vol. 42, No. 5 (2017)

• Numerical Study of Laminar Flame Velocity of Hydrogen-Enriched Methane
Flames Using Several Detailed Reaction Mechanisms
• Authors: Ridha Ennetta; Meryem Alaya; Rachid Said
Pages: 1707 - 1713
Abstract: Abstract The focus of this research work is to investigate the effect of adding hydrogen on the laminar speed of hydrogen-enriched methane flame. The laminar velocities of methane–hydrogen–air mixtures are very important in designing and predicting the progress of combustion and performance of $$\hbox {H}_{2}$$ -fueled combustion devices. In this study, laminar flame velocities of various compositions of $$\hbox {CH}_{4}{-}\hbox {H}_{2}$$ –air mixtures (from 0 to 100 % hydrogen) have been calculated for different equivalence ratios (ranging from 0.6 to 1.4) and using several detailed reaction mechanisms. Simulations were carried out using the flame speed calculation (FSC) model of the chemical kinetics code Chemkin 4.02. The results of this study were compared with many measurements data of laminar flame speed from the literature, and good agreements were obtained for the whole range of hydrogen blends and equivalence ratios, especially with the detailed reaction mechanism GRIMech 3.0. This research demonstrates that the laminar burning velocity of methane flame was enhanced by the addition of hydrogen.
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2275-3
Issue No: Vol. 42, No. 5 (2017)

• Aerodynamic Multi-Parameter Optimization of NACA0012 Airfoil Using
Suction/Blowing Jet Technique
Pages: 1727 - 1735
Abstract: Abstract In this research, three-parameter numerical optimization of aerodynamic characteristics of an airfoil at high angle of attack is carried out. The separation region is reduced with two types of suction/blowing usage: single blowing function jet and combined suction and blowing jets. Genetic algorithm is used to optimize the three parameters of the suction/blowing jet strength, jet angle and jet location. The objective of this investigation was to reduce the high separation region over the NACA0012 airfoil to enhance its aerodynamic characteristics. The time-averaged compressible Navier–Stokes equations with Spalart–Allmaras turbulence model are solved along with optimization algorithm. The lift-to-drag ratio is increased up to 80 % with respect to the uncontrolled flow field.
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2259-3
Issue No: Vol. 42, No. 5 (2017)

• Fabrication of NanoSiC-Reinforced Al2024 Matrix Composites by a Novel
Production Method
• Authors: Temel Varol; Aykut Canakci; Emre Deniz Yalcin
Pages: 1751 - 1764
Abstract: Abstract In this paper, flake powder metallurgy technique is described for fabricating near-net-shape SiC nanoparticle-reinforced Al2024 matrix composites. The effect of the particle size on the flake Al2024 matrix powders and the amount of SiC nanoparticles in the particle distribution, microstructure, relative density, and hardness of SiC nanoparticle-reinforced Al2024 matrix composites were investigated. The flake Al2024 matrix powders were mixed with three different as-received Al2024 powders particle sizes by ball milling. Microstructural characterization revealed a flake-like microstructure and dispersed SiC nanoparticles between the Al2024 matrix powders with grain boundaries containing sufficient area for the reinforcement particles. The hot pressed density increased as the matrix size decreased due to the small frictional forces observed between the fine flake particles. The hardness of Al2024/SiC nanocomposites increased as the size of the Al2024 matrix powders decreased.
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2295-z
Issue No: Vol. 42, No. 5 (2017)

• Fiber Laser Welding of Thin Nickel Sheets in Air and Water Medium
• Authors: Vikash Kumar; Manowar Hussain; Mohammad Shahid Raza; Alok Kumar Das; N. K. Singh
Pages: 1765 - 1773
Abstract: Abstract In the present research, fiber laser beam welding (FLBW) of thin nickel sheets in two different mediums, i.e., air and water, has been investigated. In air medium, the fiber laser welding operations are performed at different laser powers (60, 80 and 100 W) and scanning speeds (40, 60 and 80 mm/min). Underwater welding operations have also been investigated at three different laser powers (330, 350 and 370 W) and two different scanning speeds (20 and 40 mm/min). The results show that welding of Ni sheet with higher laser power results in prominent heat-affected zone, increase in both microhardness and wt% of oxide formation in the weldment in both air and water medium. It is found that the increase in microhardness of weldment leads to the reduction in grain size. The heat-affected zone is reduced when scanning speed is increased. The wt% of oxygen increases with an increase in power during FLBW operation at constant scanning speed, and the oxide formation can be controlled by varying the laser power and scanning speed. The welding medium has significant influences on the properties of the weldments.
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2305-1
Issue No: Vol. 42, No. 5 (2017)

• Interfacial Mechanical Performance of Composite Honeycomb Sandwich Panels
for Aerospace Applications
• Authors: U. Farooq; M. S. Ahmad; S. A. Rakha; N. Ali; A. A. Khurram; T. Subhani
Pages: 1775 - 1782
Abstract: Abstract A simple and cost-effective manufacturing process was employed to prepare composite honeycomb sandwich panels for aerospace applications. Carbon fiber–epoxy matrix composite facesheets were first prepared by vacuum-assisted resin transfer molding, and later these facesheets were bonded with the Nomex $$^{\textregistered }$$ honeycomb core by compression technique wherein the whole sandwich assembly containing facesheets, epoxy- based adhesive film and honeycomb core was clamped between two parallel metallic plates followed by curing in oven. Different curing temperatures, i.e., 100, 110, 120 and 130 $${^{\circ }}$$ C, and curing times, i.e., 2 and 3 h, were employed to optimize the curing parameters of the adhesive film to join CF–epoxy facesheets with the honeycomb core. The optimization of the curing parameters was related to the maximum load-bearing capability of composite honeycomb sandwich panels under three-point bend test and associated mechanical properties. It was shown that the composite honeycomb sandwich panels cured at 130 $${^{\circ }}$$ C for 3 h demonstrated maximum mechanical performance.
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2307-z
Issue No: Vol. 42, No. 5 (2017)

• Shear Waves in an Initially Stressed Elastic Plate with Periodic
Corrugations
Pages: 1831 - 1840
Abstract: Abstract The influence of the combined effect of initial stress and periodic surface corrugation on ultrasonic SH wave propagation in an elastic plate is investigated. Considering weak surface corrugations, a small parameter is defined using the ratio between the corrugation amplitude and the average thickness of the plate and the perturbation method of strained parameters is used up to the second order. An equation for evaluating the wave phase velocity in the periodically corrugated plate is realized. Numerical examples are provided to graphically illustrate the variations of the phase velocity in periodic plates, with various corrugation amplitudes and wavelengths, under compressive and tensile initial stresses over a frequency spectrum. The study reveals the dispersive nature of SH waves in corrugated plates. It is found that the wave phase velocities are slightly higher (lower) in plates under initial tension (compression) than initially stress-free plates. The influence of initial stresses on SH phase speed decreases as the frequency increases. It is shown that periodic surface roughness has a stronger effect on reducing wave phase speeds than a shallow surface waviness.
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2332-y
Issue No: Vol. 42, No. 5 (2017)

• Dynamics and Control of a Robotic Arm Having Four Links
• Authors: H. M. Al-Qahtani; Amin A. Mohammed; M. Sunar
Pages: 1841 - 1852
Abstract: Abstract The manipulator control is an important problem in robotics. To work out this problem, a correct dynamic model for the robot manipulator must be in hand. Hence, this work first presents the dynamic model of an existing 4-DOF robot manipulator based on the Euler–Lagrange principle, utilizing the body Jacobian of each link and the generalized inertia matrix. Furthermore, essential properties of the dynamic model are analyzed for the purpose of control. Then, a PID controller is designed to control the position of the robot by decoupling the dynamic model. To achieve a good performance, the differential evolution algorithm is used for the selection of parameters of the PID controller. Feedback linearization scheme is also utilized for the position and trajectory tracking control of the manipulator. The obtained results reveal that the PID control coupled with the differential evolution algorithm and the feedback linearization control enhance the performance of the robotic manipulator. It is also found out that increasing masses of manipulator links do not affect the performance of the PID position control, but higher control torques are required in these cases.
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2324-y
Issue No: Vol. 42, No. 5 (2017)

• The Experimental Investigation of Springback in V-Bending Using the
Flexforming Process
• Authors: İbrahim Karaağaç
Pages: 1853 - 1864
Abstract: Abstract The flexforming process is a sheet metal forming method that uses hydraulic fluid pressure and a rubber diagram to form sheet metal with a die. This study, for the first time, experimentally investigates the factors affecting the springback resulting from the bending of copper and brass sheet metal materials in V-bending dies using the flexforming process. Additionally, the formability during the V-bending method was experimentally investigated by using thin, high-pressure-resistant rubber membranes instead of the thick ones commonly used in the flexforming processes. The process parameters in the experimental studies were determined to be: holding time (0, 5 and 10 s), bending angle ( $$15^{\circ }, 30^{\circ }, 45^{\circ }, 60^{\circ }, 75^{\circ }$$ and $$90^{\circ })$$ and fluid pressure (10, 12 and 14.4 MPa). Sheet metals were formed in V-bending dies by both flexforming and conventional bending processes to compare the performance of the flexforming process against the conventional bending process. Springback values in the parts formed using the flexforming process for copper and brass sheet metals were determined to be 39.06 and 41.42% less, respectively, than those formed by the conventional bending method. Surface flaws occurring in the parts formed by the conventional bending method were not observed in the parts formed using the flexforming process. The springback was also estimated by using fuzzy logic based on unexecuted break-test parameters. When the outputs of the fuzzy logic system were compared with the experimental results, it was observed that the results were substantially similar.
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2329-6
Issue No: Vol. 42, No. 5 (2017)

• Electromechanical Response of Dip-Coated Silver Films on Micro-Bumpy
Polymer Surface
• Authors: Syed Murtuza Mehdi; Maaz Akhtar; Ahmad Hussain; Dheya Shuja Alothmany; Kyung-Hyun Choi
Pages: 1903 - 1908
Abstract: Abstract Mechanical performance of nanoparticle-based thin films depends on the method of fabrication and the properties of the underlying substrate. This study presents experimental results of electromechanical response of micrometer-thick dip-coated silver nanoparticle-based films on rough and highly compliant (Young’s modulus between 120 and 130 kPa) polydimethylsiloxane substrate having random micro-bumpy surface. The experimental results demonstrate stretchability of 13% and flexibility of 3.43% for the as-fabricated metal–polymer laminate. The entire process being amenable to mass production suggests a cost-effective and high-throughput route toward the fabrication of stretchable/flexible electronic devices and thin film sensors.
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2358-1
Issue No: Vol. 42, No. 5 (2017)

• Solar Pond Window Technology for Energy-Efficient Retrofitting of
Buildings: An Experimental and Numerical Investigation
• Authors: Erdem Cuce; Pinar Mert Cuce
Pages: 1909 - 1916
Abstract: Abstract Windows are responsible for an important proportion of heat loss from building envelope due to inadequate insulative characteristics of traditional glazing products. In this respect, advanced glazing solutions are of vital importance to mitigate energy demand of buildings, thus to reduce carbon emissions. Therefore, in this research, a novel glazing technology called solar pond window is introduced, and it is numerically and experimentally investigated for different design configurations. The optimum design of this novel glazing covers four 5-mm-thick glass panes, two 20-mm-thick water layers, and one 20-mm-thick Krypton layer in the middle. The average heat transfer coefficient (U-value) of the optimum case is found to be about 0.40 W/ $$\hbox {m}^{2}$$  K. If air is used as insulative gas in the interlayer, the U-value of the glazing is determined to be around 0.90 W/ $$\hbox {m}^{2}$$  K, which is still competitive with the U-value range of argon-filled triple-glazed windows with low-e coatings. The fabrication cost of the optimum design of solar pond window is around €120/ $$\hbox {m}^{2}$$ . Overall, solar pond window technology is a cost-effective and energy-efficient glazing, which has a great potential to be the future of fenestration products as well as being capable of meeting the latest building fabric standards.
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2375-0
Issue No: Vol. 42, No. 5 (2017)

• Numerical Approach for Steady State Analysis of Hydrogen–Natural Gas
Mixtures Flows in Looped Network
• Authors: Zahreddine Hafsi; Sami Elaoud; Mohsen Akrout; Ezzeddine Hadj-Taïeb
Pages: 1941 - 1950
Abstract: Abstract This paper presents a mathematical formulation for analyzing the steady state behavior of a binary mixture of hydrogen–natural gas in pipelines networks. Throughout the paper, natural gas flow is assumed to be pure methane (CH4) flow as the latter is the main component of natural gas. The model development is based on a new correlation for compressibility factor of gas mixture. The built correlation is reposed on the resolution of Soave–Redlich–Kwong (SRK) Equation Of State (EOS). The compressibility factor, numerical solution of real gas EOS, is validated through a comparison with experimental values issued from gas compressibility charts as well as empirical results inspired by analytical expressions. Basing on the established expression for the compressibility factor, continuity and motions equations are integrated in steady state. Thus, a pressure drop expression is given. The latter is used to balance a looped network of hydrogen–natural gas mixture. The implemented algorithm of looped network balancing is reposed on resolution of nodes and loops equations using Newton–Raphson method. Pressure and velocity evolutions along the network ducts are followed up, and thus, the effect of hydrogen injection in natural gas network is analyzed.
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2393-y
Issue No: Vol. 42, No. 5 (2017)

• Fault Diagnosis of Bearing Based on Wavelet Packet Transform-Phase Space
Reconstruction-Singular Value Decomposition and SVM Classifier
• Authors: Sheng-wei Fei
Pages: 1967 - 1975
Abstract: Abstract The excellent features of bearing vibration signal are helpful to obtain accurate diagnosis results for the failure of bearing. In this study, the feature extraction method of bearing vibration signal based on wavelet packet transform-phase space reconstruction-singular value decomposition (WPS) is presented to improve the traditional feature extraction method of bearing vibration signal based on wavelet packet transform-singular value decomposition (WS). In the proposed feature extraction method, singular value decomposition is performed for phase space reconstruction signal of each wavelet packet coefficient’s reconstructed signal of bearing vibration signal. The dynamic characteristics of a certain frequency range can be reflected by phase space reconstruction for wavelet packet coefficients’ reconstructed signals of bearing vibration signal. Support vector machine (SVM) is a machine learning method based on structural risk minimization principle, and SVM classifier can solve the classification problems with small training samples, high dimensions, and nonlinearity. Thus, the SVM model of bearing is established by the features of bearing vibration signal based on wavelet packet transform-phase space reconstruction-singular value decomposition in this study. The experimental results show that the feature extraction method of bearing vibration signal based on wavelet packet transform-phase space reconstruction-singular value decomposition is better than the feature extraction method of bearing vibration signal based on wavelet packet transform-singular value decomposition, and SVM established by the features of bearing vibration signal based on wavelet packet transform-phase space reconstruction-singular value decomposition (WPS-SVM) has a stronger fault diagnosis ability of bearing than SVM established by the features of bearing vibration signal based on wavelet packet transform-singular value decomposition (WS-SVM).
PubDate: 2017-05-01
DOI: 10.1007/s13369-016-2406-x
Issue No: Vol. 42, No. 5 (2017)

• Dynamic Modeling of Magneto-electrically Actuated Compositionally Graded
Nanosize Plates Lying on Elastic Foundation
Pages: 1977 - 1997
Abstract: Abstract The vibration problem of a nonlocal magneto-electro-elastic functionally graded (MEE-FG) nanoplate lying on two-parameter elastic foundation under different boundary conditions is examined through a trigonometric plate formulation. Based on power-law model, graded material properties of the nanoplate are described. Employing Hamilton’s principle, the formulation of shear deformable MEE-FG nanoplates lying on elastic substrate is presented. Admissible functions are provided to satisfy various boundary conditions and analytically solving the governing equations. Effects of elastic substrate, axial magneto-electrical load, various edge conditions, nonlocality parameter and material gradation on vibration frequencies of a MEE-FG nanoscale plate are studied. It is observed that vibration response of MEE-FG nanoplates is prominently influenced by these parameters.
PubDate: 2017-05-01
DOI: 10.1007/s13369-017-2413-6
Issue No: Vol. 42, No. 5 (2017)

• Accurate Position and Posture Control of a Redundant Hexapod Robot
• Authors: Gang Chen; Bo Jin; Ying Chen
Pages: 2031 - 2042
Abstract: Abstract The position and posture of multilegged robots are often readjusted to achieve optimum stability and movement space in rough terrains. The accurate position and posture control method are adopted to improve its control accuracy. The D–H model and direct kinematics on the robot’s velocity is analyzed, upon which an inverse redundant kinematics model on the hexapod robot’s velocity is presented. The relationship between rotation and posture angular velocities is investigated, and an inverse redundant position and posture kinematics model on the hexapod robot’s velocity is proposed. The accurate position and posture control model of the redundant hexapod robot are constructed and implemented using the inverse redundant position and posture kinematics on velocity. Simulations and experiments on the accurate position and posture control method test the model’s correctness and availability. This method is also applied in the walking movement of a redundant hexapod robot and verifies its effectiveness.
PubDate: 2017-05-01
DOI: 10.1007/s13369-017-2421-6
Issue No: Vol. 42, No. 5 (2017)

• Metallurgical Study of Stellite 6 Cladding on 309-16L Stainless Steel
• Authors: Mohammed Mohaideen Ferozhkhan; Kottaimathan Ganesh Kumar; Rajanbabu Ravibharath
Pages: 2067 - 2074
Abstract: Abstract 309-16L stainless steel was deposited over base metal Grade 91 steel (9Cr–1Mo) as buffer layer by shielded metal arc welding (SMAW), gas tungsten arc welding (GTAW) and flux cored arc welding processes, and then, Stellite 6 (Co–Cr alloy) was coated on stainless steel buffer by SMAW, GTAW and plasma transferred arc welding processes. Stellite 6 coatings were characterized using optical microscope, Vickers hardness tester and optical emission spectrometer, respectively. The FCA deposit has less heat-affected zone and uniform hardness than SMA and GTA deposits. The buffer layer has reduced the formation of any surface cracks and delamination near the fusion zones. The microstructure of Stellite 6 consists of dendrites of Co solid solution and carbides secretion in the interdendrites of Co and Cr matrix. Electron-dispersive spectroscopy line scan has been conducted to analyse the impact of alloying elements in the fusion line and Stellite 6 deposits. It was observed that dilution of Fe in PTA-deposited Stellite 6 was lesser than SMA and GTA deposits and uniform hardness of 600–650  $$\hbox {HV}_{0.3}$$ was obtained from PTA deposit. The chemical analysis resulted in alloy composition of PTA deposit has nominal percentage in comparison with consumable composition while GTA and SMA deposits has high dilution of Fe and Ni.
PubDate: 2017-05-01
DOI: 10.1007/s13369-017-2457-7
Issue No: Vol. 42, No. 5 (2017)

• The Effect of Freestream Flow Velocities on the Flexible Printed Circuit
Board with Different BGA Package Arrangements
• Authors: C. H. Lim; M. Z. Abdullah; I. A. Azid; C. Y. Khor
Pages: 2075 - 2086
Abstract: Abstract The desire of flexibility, light weight and low cost in current electronic device has increased the application of flexible printed circuit board (FPCB). This paper aims to investigate the effect of different Reynolds number (Re) toward FPCB attached with ball grid array (BGA) package in different arrangements. Actual BGA package with 100 solder joints incorporating FPCB was attached to a fixture in wind tunnel test section to perform FPCB’s deflection analysis with different flow velocities and package’s configurations. Furthermore, numerical simulation was also performed to obtain numerical deflection and stress value. The findings show that the Reynolds numbers have a substantial effect to the FPCB’s deflection and stress. However, the BGA package’s positions on the FPCB were found to be insignificant to the responses. The actual BGA package on FPCB as presented in this paper will represent more realistic values of determined FPCB’s deflection and stress.
PubDate: 2017-05-01
DOI: 10.1007/s13369-017-2491-5
Issue No: Vol. 42, No. 5 (2017)

• Experimental Set-Up for 2D Cargo Release Test in Subsonic Wind Tunnel
• Authors: M. D. Manshadi; A. R. Mostofizade; M. A. J. Vaziri
Pages: 2157 - 2166
Abstract: Abstract The objective of this research is to design a 2D inexpensive mechanism for testing the cargo separation in a wind tunnel. Our designed mechanism simulates the separation of a NACA-0012 airfoil from the upper wall of a wind tunnel. To perform the test, we have used a low-speed (0–100 m/s) wind tunnel with a $$160\times 80\times 100$$  cm test chamber. First, 2 electromagnets fix the model in its initial position so that the wind tunnel reaches the required speed. Then, the power is cut off, the model releases and the test begins. Finally, the movements are stopped by the spring and other limiters, and the test finishes. The process is filmed during the test by special cameras and, using image processing. The x, y, and $$\theta$$ diagrams with respect to the time are presented as the test results. There are also two accelerometers which are installed on the mechanism along x and y directions; they store acceleration with respect to the time and make it possible to calculate the velocity and position of the body at any moment. Such limitations as costs, availability in the market, aerodynamic, and structure were also studied during the design process. To create 2D aerodynamic conditions, 2 circular plates were fixed at the beginning and end of the wing. To provide appropriate structural strength (safety factor of 2), the diameter of the horizontal and vertical steel rails are considered 1 and 2 cm, respectively.
PubDate: 2017-05-01
DOI: 10.1007/s13369-017-2450-1
Issue No: Vol. 42, No. 5 (2017)

• Numerical Investigation of a Vertical Axis Tidal Turbine with Deforming
• Authors: Mohamed Taher Bouzaher; Mohamed Hadid
Pages: 2167 - 2178
Abstract: Abstract The vertical axis tidal turbines are initially constructed by using simple rigid blades. As an alternative to the conventional rigid blades, the proposition of the present work is to deform the blade leading edge via a sinusoidal smoothed curve. A deforming mesh involving both sliding and remeshing techniques is used to control and update the mesh throughout the system motion. Examinations of the shed vortices interactions and the accompanying pressure contours indicate that the correction of the leading edge shape gives rise to a vortex with large size at an advanced stage than the conventional blade. This vortex promotes in turn, the blades suction zone which alters the pressure distribution along the blade’s surfaces. The turbine efficiency is boosted by 35% relative to the uncontrolled case.
PubDate: 2017-05-01
DOI: 10.1007/s13369-017-2511-5
Issue No: Vol. 42, No. 5 (2017)

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