 Subjects -> AERONAUTICS AND SPACE FLIGHT (Total: 124 journals)
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- Inter-Caliber Sector-Type Air Intake Device
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Abstract: The paper considers a design scheme of a circular sector-type air intake, which, unlike the known ones, provides the maximum possible values of throttling characteristics at small angles of attack as well as stability in off-design modes of operation.
PubDate: 2023-04-01
- Spectral Characteristics of Three-Dimensional Flow around a Circular
Cylinder-
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Abstract: An unsteady three-dimensional flow of incompressible fluid around a circular cylinder is numerically investigated using the Navier–Stokes equations at a Reynolds number of 3900. The integral and distributed characteristics of the flow around the cylinder are analyzed. To analyze the spectrum of a transversal component of the velocity vector in the time domain, the power spectral density and the energy spectrum of the signal are studied. The resulting spectral properties are compared with the scaling laws “–5/3” and “–2” for a sampled in the time domain signal.
PubDate: 2023-04-01
- On Optimum Coolant Injection into a Laminar Boundary Layer in Supersonic
Gas Flows-
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Abstract: The paper considers the variational problem on minimization of convective heat flux transferred from a heated laminar boundary layer in a supersonic flow to a streamlined surface.
PubDate: 2023-04-01
- Research of Ducted Propellers. Comparison of Ducted Propellers with
Conventional Single-Row and X-Shaped Double-Row Propellers-
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Abstract: An optimal two-row six-blade X-propeller is compared with a conventional three-blade and six-blade propeller mounted in the same rings.
PubDate: 2023-04-01
- Heat Transfer in Diffuser-Type Dimples Streamlined by Pulsating Flow
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Abstract: Experimental data on average heat transfer from the surface of a single-cavity diffuser-type dimple streamlined by a pulsating air flow were obtained in the study. It was found out that when the dimple is installed at 0 and 60 deg to the flow, different mechanisms of large-scale vortex formation are implemented. As a consequence, reasons for heat transfer enhancement in the dimple are also different.
PubDate: 2023-04-01
- The Concept of a Force-Measuring Device for Ground Testing of Propulsion
System Demonstrators-
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Abstract: The paper investigates the proposed concept of a force-measuring device for ground testing of propulsion system demonstrators and its mathematical model as well as the effect of scaling the large flange of the device on the displayed data at a constant load.
PubDate: 2023-04-01
- Tools for Researching Some Aspects of Reliability and Service Life of
Semiconductor Spark Plugs-
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Abstract: The paper proposes a universal experimental bench for developing a method for tolerance control of parameters of capacitive ignition systems with semiconductor spark plugs as well as for carrying out endurance tests of spark plugs.
PubDate: 2023-04-01
- Film Cooling Forming Features of the Turbine Nozzle Vanes Leading Edge
Neighborhood Taking into Account Entry Flow Irregularity-
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Abstract: The paper gives the results of investigation of the inlet flow irregularity influence on the film cooling formation. It is shown that the total pressure diagram irregularity in the set of nozzles inlet changes the structure of the film cooling in the initial region of the nozzle vane pressure side. Cooler flow displacement is registered in the regions of the total pressure gradient, interference of the perforation rows is broken, and overheat regions appear.
PubDate: 2023-04-01
- Modernization of the Shape Control System for the Radio-Reflecting Surface
of a Transformable Space Antenna-
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Abstract: A new approach is considered to building a control system for the radio-reflecting surface geometry of large transformable space antennas. A design of a device is described, which allows reducing weight and dimensions of the entire system by using a switchable reducer, and advantages of power supply and control using current-conductive parts and structural elements of the antenna are considered.
PubDate: 2023-04-01
- Influence of Dimensions of Rectangular Cutouts and Modulus of Elasticity
of Reinforcing Embedded Elements on the Stress-Strain State of Sandwich
Compartments-
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Abstract: A model of layer-by-layer finite element stress-strain analysis of sandwich shells is presented. The influence of the dimensions of rectangular cutouts and the modulus of elasticity of reinforcing embedded elements on the stress-strain state of sandwich compartments is studied.
PubDate: 2023-04-01
- Analysis of Effectiveness of the External Expansion Nozzle with a
Perforated Central Body-
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Abstract: The paper substantiates the application of an external expansion (“aerospike”) nozzle with a profiled central body to a wedge-air rocket engine operating in a wide range of flight altitudes and external pressures. A numerical simulation of the flow of hydrocarbon fuel combustion products along the aerospike nozzle at different flight altitudes is performed. We consider a flow around a smooth profiled central body and a central body with a perforated insert, which supposedly reduces the aerodynamic drag and improves the thrust characteristics. The parameters of the gas entering the nozzle correspond to the conditions at the outlet of the combustion chamber of the well-tested scheme of the power plant. The calculation of the thrust characteristics of a wide-range jet engine shows a noticeable increase in the thrust force of an external expansion nozzle made with perforated inserts comparing with thrust of the traditional dual-bell nozzle.
PubDate: 2023-04-01
- Energy Concept of the Surface of Metal Aircraft Parts
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Abstract: An energy approach to the consideration of the state of the surface of metal aircraft parts is proposed. The energy aspects of the processes occurring in parts during manufacture, operation, and repair are analyzed. The possibility of estimating the energy state of the surface of metal parts by the contact potential difference method is shown.
PubDate: 2023-04-01
- Conjugate Heat Transfer Validation of Gas Turbine Engine Cooling Turbine
Vanes-
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Abstract: The paper considers the processes of design and validation of gas turbine engine cooling elements of the high pressure turbine that apply the prediction methodology of conjugate heat transfer and validation of the experimental measurements correspondence. To get the blade body temperatures corresponding to the measured ones, the correctable film cooling temperatures as well as gas and air parameters are set. The predicted temperatures of metal are compared with ones measured during the gas turbine engine test in order to substantiate the presented procedure and adjust the gas temperature at the inlet to the gas domain.
PubDate: 2023-04-01
- Mathematical Modeling of Operation of the Electrically Driven Propeller
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Abstract: The paper presents a mathematical model of operation of the power plant of an electrically driven unmanned aerial vehicle with propellers. This model is designed to calculate the UAV aerodynamic and flight performance. To correctly account for changes in the efficiency of the propeller and the electric motor by speed, it is proposed to jointly solve a system of equations describing their operation. An algorithm is given for solving the system of transcendent equations determining the voltage and current values that provide a required propeller thrust. It is shown that the proposed algorithm gives a reliable result that corresponds to the available experimental data.
PubDate: 2023-04-01
- Nonequilibrium Homogeneous Condensation in Supersonic Multiphase Flows
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Abstract: A mathematical model for numerical simulation of high-velocity flows is presented. The methodology makes it possible to study complex physical phenomena in a multiphase dispersed flow including high pressure gas dynamics, shock waves, and other effects of compressible flow, phase transition and multiphase flow, formation, convection, and viscous transport. The numerical finite volume method on unstructured meshes is used. A parametric study of the flow of a mixture of water vapor and air in a supersonic underexpanded jet has been carried out.
PubDate: 2023-04-01
- Research of Ducted Propellers. Comparison of Coaxial, Four Bladed, and
Eight-Bladed Counter-Rotating Propeller-
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Abstract: The paper considers single-row ducted fans with four-blade and eight-blade propellers, as well as a two-row ducted fan with four-bladed counter-rotating propellers. The effect of ring length on thrust and propulsion efficiency is investigated.
PubDate: 2023-04-01
- Outflow of Supersonic Gas Jets from Axisymmetric Nozzle into a Space with
a High Nozzle Pressure Ratios-
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Abstract: The results of computational studies of the gas-dynamic and geometric parameters of supersonic gas jets outflowing from axisymmetric nozzles into a submerged space with strong underexpansion are presented based on the finite volume method and the marching method.
PubDate: 2023-04-01
- A Technique of Hydraulic System Optimization at the Preliminary Design
Stage by the NSGA-II Genetic Algorithm-
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Abstract: The paper describes a technique of optimization of a hydraulic system at the stage of preliminary design by the NSGA-II genetic algorithm. Optimization criteria are the minimization of the structure mass and minimization of the system volume. A modification of the method of main contours for the matrix representation of the system is described, as well as functions for determining the flow and the pressure for each branch of the hydraulic system, to implement the principle of efficient flow distribution. The description and the flow-chart of the optimization technique for the hydraulic system with the use of the NSGA-II genetic algorithm is included as well as the method of choosing the suitable solution from the set of Pareto optimal solutions accounting the weight coefficients.
PubDate: 2023-04-01
- Influence of Incidence on Streamlines and Profile Losses of Turbine
Cascades-
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Abstract: Analysis of results of experimental investigation of turbine cascades is carried out. It is showed that the nature of the influence of negative incidences on profile losses can be determined by the streamline of the inlet part of the airfoil at design mode. The conditions are revealed, under which, at moderate incidences, incidence losses are negative, zero, and positive. Geometric parameters of cascades with favorable and unfavorable streamline are defined, and recommendations for choosing the optimal inlet metal angle in the designed cascades are refined.
PubDate: 2023-04-01
- Specific Features of Transient Processes in Stationary Plasma Thrusters
and a Device for Their Simulation-
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Abstract: The paper demonstrates the advisability of studying characteristics of transient processes in every component of a new high-pulse dual-mode correction unit based on the stationary plasma thruster during its firing, steady-state operation in all main modes, and cutoff for the purpose of considering the influence of gas-discharge processes on performance of the high-pulse dual-mode correction unit components.
PubDate: 2023-04-01
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