AUTHORS: Olga Azarova, Ludmila Gvozdeva, Oleg Kravchenko

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ABSTRACT: The paper is devoted to the control of supersonic flows past aerodynamic bodies under the action of external energy deposition. Mechanism of the interaction of a bow shock over a body with the oblique shock resulting from the refraction of the bow shock at the external energy source surface is revealed. Different types of shock waves intersection might appear in this process, among them are triple shocks configurations. Here unsteady triple-shock configurations in the vicinity of the surface of combined cylinder bodies “hemispherecylinder” and “hemisphere-cone-cylinder” are investigated under the action of external energy deposition at M=4 for gaseous media with ratio of specific heats 1.4 and 1.2. The investigations have been conducted numerically using inviscid approach on a base of the Euler equations. Complex conservative difference schemes are used in the simulations. An effect of a triple-shock configuration on the body surface pressure has been studied. Generation of local space-time areas with increasing boundary pressure has been established. Mechanism of boundary pressure growth together with local front drag force increase is shown to be connected with a vortex action as well as the action of the arising shock segments in the vicinity of triple-shock configuration. Dependences of the angles of triple-shock configuration on the rarefaction degree in the energy source and on the incident shock angle have been obtained. Also, the comparison with the plane case has been conducted. The results can be used for organization of flow control via external energy deposition by means of laser, microwave or electrical discharge.

KEYWORDS: - Supersonic flow, gas media, external energy deposition, triple-shock configuration, complex conservative difference scheme

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