Control of Triple-Shock Configurations and Vortex Structures Forming in High Speed Flows of Gaseous Media past an AD Body under the Action of External Energy Sources

Abstract

Abstract:The problem of supersonic streamlining of an aerodynamic (AD) body, "a plate blunted by a cylinder", by a flow with the freestream Mach number M = 4 containing an external energy source has been studied, taking into account physicochemical transformations. The results of the effect of the ratio of specific heats γ changing in the range from 1.1 to 1.4 on the dynamics of triple-shock configurations and vortex-contact structures are presented for the interaction of an energy source with the bow shock wave. The energy source is modeled via the heated rarefied layer (filament). The angles in the triple-shock configurations, the stagnation pressure, together with the frontal drag force, have been studied dependent on the specific heats ratio γ, the characteristics of the energy source, and also on the angle of the incident shock. Vortex-contact structures have been researched for the Mach numbers 7, 8, 9, as well as the generation of the Richtmyer-Meshkov instability accompanying the formation of a triple-shock configuration. The results show a strong influence of the specific heats ratio of the gas medium and the parameters of the energy source on the triple-shock configuration and aerodynamic characteristics of the body. This conclusion can be useful for aerospace applications in the area of the design of nozzles, intakes, and high speed flying vehicles. Additionally, the results show the possibility of flow control in the atmospheres of other planets using external energy deposition.

Dynamics of Shock Structure and Frontal Drag Force in a Supersonic Flow Past a Blunt Cone under the Action of Plasma Formation

“…This discontinuity (see image for t = 0.7174) can be the nearest shock to the body in the experimental image in Figure 3c. Multiple bow shock diffractions are observed during this stage of the interaction (t = 0.62-0.68), with the formation of a triple configuration in the upper part of the flow (t = 0.66-0.7) [27,28].…”

“…In experiments, the possibility of using plasma formations (plasmoids) to change the supersonic flow near the model has been investigated in [26]. Complicated shock structures are formed in the processes of the energy sources-shock layers interaction including formation of triple-shock configurations [27,28]. The essential impact on the dynamics of the frontal drag force and the bow shock wave behaviour due to the presence of a heated area produced by energy release was obtained in all of these studies.…”

Control of triple-shock configurations in high-speed flows over a cylindrically blunted plate in gases for different Mach numbers

“…Controlling triple-shock configurations together with accompanying vortex structures via an energy deposition has been suggested. 7…”

Short Review of Modeling, Analysis and Prediction of Shock Structures with Multiple Reflections of Simple Waves. Experimental and Numerical Studies

“…FSMR have been obtained numerically in problems of interaction of a flat stationary shock wave with a boundary of heated and cold gases for M=7-9 [6] (Figure 3). These structures arise in an area between two contact discontinuities (shear layers) together with triple-shock configurations and accompany a vortex generation.…”

“…Flow structures with multiple reflection of simple waves (compression waves and rarefaction waves) were obtained experimentally and numerically in different cases when a primary wave is dislocated inside the flow area between a flat parallel tangential shock and a hard wall [3,4] or between two contact discontinuities (shear layers) [5,6]. Such type of shock structures was discovered in different problems: problems of streamlining a body by a supersonic flow containing an external energy source or in problem of interaction of plane shock wave with the boundary of heated and cold gases or in the situation of Edney IV shock/ shock interaction.…”