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