scholarly journals SPECIFIC FEATURES OF A PLANE SUPERSONIC FLOW

2020 ◽  
Vol 2 (7(76)) ◽  
pp. 11-17
Author(s):  
Yu.I. Cybizov
Keyword(s):  
Supersonic Flow ◽  
Experimental Studies ◽  
Physical Plane ◽  
Supersonic Speed ◽  
Input Parameters ◽  
Zone Of Influence ◽  
One To One

The purpose of this work is to study the characteristics of the flow with supersonic speed when using the tangential and radial components of convective acceleration and associated elements of the characteristic grid as parameters. Using input parameters allows to expand understanding of the zone of influence of disturbances and the nature of the forces contributing to isentropic acceleration (deceleration) of flow and one-to-one mapping between the physical plane and the hodograph of the velocity. The obtained results are proposed to be used in solving applied problems and analyzing experimental studies.

Surface pressures on a wing moving with supersonic speed

1974 ◽  
Vol 341 (1625) ◽  
pp. 177-193 ◽  
Keyword(s):  
Supersonic Flow ◽  
Delta Wing ◽  
Leading Edge ◽  
Ideal Gas ◽  
Numerical Results ◽  
Coordinate Surface ◽  
Supersonic Speed ◽  
Extrapolation Procedure ◽  
Specific Heats ◽  
Limiting Values

Estimates for pressures on the surface of a given delta wing at zero incidence in a steady uniform stream of air are obtained by numerically integrating two semi-characteristic forms of equations which govern the inviscid supersonic flow of an ideal gas with constant specific heats. In one form of the equations coordinate surfaces are fixed in space so that the surface of the wing, which has round sonic leading edges, is a coordinate surface. In the other, two families of coordinates are chosen to be stream-surfaces. For each form of the equations, a finite difference method has been used to compute the supersonic flow around the wing. Convergence of the numerical results, as the mesh is refined, is slow near the leading edge of the wing and an extrapolation procedure is used to predict limiting values for the pressures on the surface of the wing at two stations where theoretical and experimental results have been given earlier by another worker. At one station differences between the results given here and the results given earlier are significant. The two methods used here produce consistent values for the pressures on the surface of the wing and, on the basis of this numerical evidence together with other cited numerical results, it is concluded that the pressures given here are close to the true theoretical values.

scholarly journals Problems of operative prediction of seismic events. The suggested way to solution

2021 ◽  
pp. 120-132
Author(s):  
В.А. Паровышный ◽  
Л.М. Богомолов ◽  
Ю.В. Сохатюк ◽  
Д.В. Паровышный
Keyword(s):  
Experimental Studies ◽  
Seismic Events ◽  
Preparation Process ◽  
Geophysical Fields ◽  
Zone Of Influence

Рассматриваются результаты экспериментальных исследований, направленных на изучение характера временных изменений естественных геофизических полей (ЕГП) над залежью газа, расположенной в зоне влияния активного регионального разлома, а также выявление связи этих изменений с сейсмичностью. В результате эксперимента установлено, что процесс подготовки сейсмических событий сопровождается резким нарушением стабильности ЕГП над продуктивными блоками залежи. The results of experimental studies aimed at studying the nature of the temporary changes in natural geophysical fields (NGF) above the gas deposit located in the zone of influence of the active regional fault, as well as revealing the connection of these changes with seismicity are found. The experiment established that the seismic events preparation process is accompanied by a sharp instability NGF above productive reservoirs of the deposit.

Influence of Thermal Protection Material Composition on Heat and Mass Exchange of Body in Spatial Supersonic Flow

2016 ◽  
Vol 683 ◽  
pp. 142-149
Author(s):  
Victor D. Goldin ◽  
Vyacheslav A. Ovchiinikov ◽  
Ivan A. Kotov
Keyword(s):  
Supersonic Flow ◽  
Surface Temperature ◽  
Mass Exchange ◽  
Thermal Protection ◽  
Conjugate Problem ◽  
Material Composition ◽  
Aerodynamic Heating ◽  
Carbon Cloth ◽  
Supersonic Speed ◽  
Heat And Mass Exchange

The conjugate problem of aerodynamic heating of a blunted cone moving in the atmosphere at angle of attack at supersonic speed is considered. Three modifications of a thermal protection material based on coal-plastic with different proportions of a phenol-formalhyde binder and a carbon cloth are investigated. The effect of the material composition on the surface temperature and the mass loss characteristics is analyzed.

E-Design Tool for Friction Stir Welding

2008 ◽  
Author(s):  
Harish Bagaitkar ◽  
Venkat Allada
Keyword(s):  
Friction Stir Welding ◽  
Experimental Studies ◽  
Lap Joints ◽  
Design Tool ◽  
Tool Geometry ◽  
Butt Joints ◽  
Web Based ◽  
Plunge Depth ◽  
Friction Stir ◽  
Input Parameters

This paper describes efforts to develop a web-based E-Design tool for the Friction Stir Welding (FSW) technique. The input parameters to the E-Design tool are the joint specifications. The output parameters of the E-Design tool are process parameters such as tool geometry details, tool rpm, and plunge depth. The heart of the E-Design tool is the FSW database. The FSW database contains mappings of various input parameters and output parameters that are captured by referring to various experimental studies cited in the literature. The proposed E-Design tool deals with lap joints and butt joints between similar aluminum alloys.

scholarly journals Optimization of Metal Inert Gas Welding Process during Joining of Structural Steels- An Overview

2020 ◽  
Vol 184 ◽  
pp. 01028
Author(s):  
Ravindra Kumar Misra ◽  
Rajesh Kumar Porwal
Keyword(s):  
Heat Treatment ◽  
Welded Joints ◽  
Experimental Studies ◽  
Welding Process ◽  
Inert Gas ◽  
Fatigue Properties ◽  
Input Parameters ◽  
Metal Inert Gas Welding ◽  
Weld Heat

Metal Inert Gas welding is a fast, reliable and cost effective technique for joining of different ferrous materials and steels used in the construction of large structures like Fe410WA, IS2062, SS304, AISI1040 and AISI316 etc. To obtain better quality and performance of the steel welded joints, parameter optimisation of metal inert gas welding procedure and weld heat treatment process is carried out. In optimization work and studies, variables of GMAW process like welding voltage and current, speed of welding, WFR (rate of wire feed), GFR (rate of gas flow), type of gas used and effect of heat treatments are kept changing to get best combinations of input parameters for best quality of welded parts. The quality of welds is evaluated in terms of mechanical properties of welded joints like ultimate tensile and yield strength, elongation, microstructure, heat affected zone and defect free weld joints etc. Model and experimental studies are done in different combinations to get best combination of input parameters for steels. Studies by authors have identified the significance of input parameters in ascending order and some of them also quantified the optimal values of the input parameters. Pre and post weld heat treatment of structures is beneficial in improvement of mechanical and fatigue properties.

scholarly journals Air Round Microjet Interaction with Coaxial Hydrogen Jet at It Combustion for Supersonic Speed Jets Efflux

2019 ◽  
Vol 14 (3) ◽  
pp. 53-63
Author(s):  
V. V. Kozlov ◽  
G. R. Grek ◽  
M. V. Litvinenko ◽  
Yu. A. Litvinenko ◽  
A. S. Tambovzev ◽  
...  
Keyword(s):  
Nozzle Exit ◽  
Acoustic Noise ◽  
Turbulent Flame ◽  
Experimental Studies ◽  
Supersonic Combustion ◽  
Small Scale ◽  
Diffusion Combustion ◽  
Supersonic Speed ◽  
Combustion Region ◽  
Flame Region

Results of experimental studies of the round air microjet interaction with a coaxial hydrogen jet at its combustion for supersonic speed jets efflux are presented in this work. It is revealed that combustion of the coaxial hydrogen jet with growth of its speed efflux is accompanied by all scenarios, observed at study of the round and plane hydrogen microjets diffusion combustion. However, “bottleneck flame region” undergoes considerable geometrical deformations because of specifics of a flame of a coaxial jet. It is shown that “bottleneck flame region” is transformed from Y-shaped to spherical shape in the activity of growth of a coaxial jet speed efflux. It is found that a round air microjet interaction with a coaxial hydrogen jet at its combustion is accompanied by several new phenomena: existence of cone-shaped area a coaxial jet combustion near a nozzle exit; existence of small-scale supersonic cells on a resultant flame; absence of the hydrogen combustion efflux from combustion region of a coaxial jet near nozzle exit; flame-out from combustion region of a coaxial jet near nozzle exit that leads to hydrogen ignition downstream, its intensive combustion and sharp acoustic noise occurrence; existence of a turbulent flame, to its separation from a nozzle exit and transition to supersonic combustion of a resultant jet.

scholarly journals Theoretical and Experimental of Evaluation of Flow Field Over a Double Delta Wing at Supersonic Speeds

2019 ◽  
Vol 8 (2S11) ◽  
pp. 2939-2943
Keyword(s):  
Stainless Steel ◽  
Flow Field ◽  
Numerical Simulations ◽  
Delta Wing ◽  
Angle Of Attack ◽  
Experimental Studies ◽  
The Body ◽  
Experimental Investigations ◽  
Supersonic Speed ◽  
Double Delta Wing

Numerical and experimental investigations of flay over double delta wing at supersonic speed are investigated . For numerical simulations , the body geometry is generated using SolidWorks software , mesh is created using Gambit and solution is obtained using Fluent sofivvare . For the experimental studies , stainless steel model is fabricated and tested in the supersonic Mind tunnel at Mach 2.5 at 0 and 5 angle of attack . The results are presented in the present paper

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