Triple-Shock Configurations in High-Speed Flows Over Plane and Cylinder Bodies in Different Gases | Chapter 8 | Physical Science: New Insights and Developments Vol. 2

 

Flow control is crucial for refining the quality of high-speed flows and improving the performance and safety of fast aircraft. Unsteady flow control through external energy deposition has been widely discussed in the literature. Such processes often involve complex shock wave interactions, including the occurrence of triple shock configurations. This сhapter considers the issues of controlling supersonic flow past aerodynamic bodies under the action of external energy supply. The mechanism of interaction of the bow shock wave with an oblique shock wave formed by the refraction of the bow shock wave on the outer surface of the energy source is revealed. Unsteady triple-shock configurations near the surface of compound cylindrical bodies "hemisphere-cylinder" and "hemisphere-cone-cylinder" under the action of external energy supply for gaseous media with an adiabatic index of 1.4 and 1.2 are investigated at freestream Mach number M = 4. The studies are carried out numerically based on the Euler equations. Complex-conservative difference schemes are used in the simulations. The influence of the triple-shock configuration on the surface pressure is investigated and the formation of local spatio-temporal regions of the increased pressure is established. It is shown that the mechanism of pressure growth at the boundary, together with the local increase in the drag force, is associated with the action of the vortex flow, as well as with the action of the resulting shock wave structures. The dependences of the angles of the three-shock configuration on the rarefaction coefficient in the energy input region and on the angle of the incident shock wave are obtained. A comparison with the plane case is made. Obtained results can be used for organization of flow control with the use of external energy deposition by means of laser, microwave or electrical discharge.

 

 

Author(s) Details

OLGA AZAROVA
Department of Mathematical Modeling of Computer-Aided Design Systems, Federal Research Center “Computer Science and Control” of RAS, Vavilova St. 40, 119333, Moscow, Russia.

 

LUDMILA GVOZDEVA
Department of Physical Gas Dynamics, Joint Institute for High Temperatures RAS, Izhorskaya Str. 13/2, 125412, Moscow, Russia.

 

OLEG KRAVCHENKO
Department of Mathematical Modeling of Computer-Aided Design Systems, Federal Research Center“Computer Science and Control” of RAS, Vavilova St. 40, 119333, Moscow, Russia.

 

Please see the book here :- https://doi.org/10.9734/bpi/psniad/v2/6358

Study on Unsteady Triple-Shock Configurations in Supersonic Flows Past Combined Cylinder AD Bodies in Different Gas Media | Chapter 09 | New Approaches in Engineering Research Vol. 12

 The regulation of supersonic flows past aerodynamic bodies under the influence of external energy deposition is the subject of this research. The mechanism of a bow shock's interaction with an oblique shock coming from the bow shock's refraction at the external energy source surface is revealed. In this process, many types of shock waves may collide, including triple-shock configurations. The analysis of unsteady triple-shock configurations near the surface of combined cylinder bodies "hemisphere-cylinder" and "hemisphere-cone-cylinder" under the operation of external energy deposition and their effect on the body surface pressure are the goals of this paper. The calculations were carried out numerically using an inviscid technique based on the Euler equations at M=4 for gaseous mediums with specific heat ratios of 1.4 and 1.2. In the simulations, complex conservative difference techniques are applied. The angles of triple-shock arrangement have been shown to be dependent on the rarefaction degree in an energy source and the incidence shock angle. With rising boundary pressure, the generation of local space-time areas has been established. The activity of a vortex as well as the action of the originating shock segments in the region of a triple-shock configuration are shown to be linked in the mechanism of boundary pressure rise and local front drag force increase. A comparison with the symmetry of plane flow has also been made. The findings can be used to plan flow control using external energy deposition such as laser, microwave, or electrical discharge.

Author(S) Details

Olga Azarova
Department of Mathematical Modeling of Computer-Aided Design Systems, Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences, Vavilova st. 40, 119333, Moscow, Russia.

Ludmila Gvozdeva
Department of Physical Gas Dynamics, Joint Institute for High Temperatures of the Russian Academy of Sciences Izhorskaya str. 13/2, 125412, Moscow, Russia.

Oleg Kravchenko
Department of Mathematical Modeling of Computer-Aided Design Systems, Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences, Vavilova st. 40, 119333, Moscow, Russia.

View Book:- https://stm.bookpi.org/NAER-V12/article/view/3843

Study on Unsteady Triple-Shock Configurations in Supersonic Flows Past Combined Cylinder AD Bodies in Different Gas Media | Chapter 9 | New Approaches in Engineering Research Vol. 12

The regulation of supersonic flows past aerodynamic bodies under the influence of external energy deposition is the focus of this research. The interplay of a bow shock over a body with the oblique shock caused by the bow shock's refraction at the external energy source surface is revealed. Triple-shock configurations, for example, are one sort of shock wave intersection that could occur during this operation. The analysis of unsteady triple-shock configurations near the surface of combined cylinder bodies "hemisphere-cylinder" and "hemisphere-cone-cylinder" under the action of external energy deposition, as well as their effect on the body surface pressure, are the goals of this article. The calculations were carried out numerically using an inviscid approach based on the Euler equations at M=4 for gaseous media with 1.4 and 1.2 ratios of specific heats. The simulations employ sophisticated conservative difference techniques. The angles of a triple-shock arrangement have been shown to be dependent on the degree of rarefaction in an energy source as well as the incidence shock angle. With increased boundary pressure, local space-time areas can be generated. The activity of a vortex as well as the action of the originating shock segments in the region of a triple-shock configuration are shown to be linked to the mechanism of boundary pressure rise and local front drag force increase. A comparison with the symmetry of the plane flow has also been made. The findings can be utilised to plan flow control using external energy deposition techniques such as laser, microwave, or electrical discharge.

Author (S) Details

Olga Azarova
Department of Mathematical Modeling of Computer-Aided Design Systems, Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences, Vavilova st. 40, 119333, Moscow, Russia.

Ludmila Gvozdeva
Department of Physical Gas Dynamics, Joint Institute for High Temperatures of the Russian Academy of Sciences Izhorskaya str. 13/2, 125412, Moscow, Russia.

Oleg Kravchenko
Department of Mathematical Modeling of Computer-Aided Design Systems, Federal Research Center “Computer Science and Control” of the Russian Academy of Sciences, Vavilova st. 40, 119333, Moscow, Russia.

View Book :- https://stm.bookpi.org/NAER-V12/article/view/3843