Numerical analysis of the effect of local energy supply on the aerodynamic drag and heat transfer of a spherically blunted body in a supersonic air flow

Abstract

Introduction. Recently, there has been growing interest in various methods for controlled change in the flow structure and aerodynamic characteristics of flying vehicles by means of the remote action of a focused electromagnetic field (gas discharge). This problem was first formulated in Russia and has been studied in other countries. By now, the possibility of implementation of this idea into practice has been supported by laboratory experiments [1][2][3][4]. Chernyi [5,6] studied numerically the interaction between a gas and an electromagnetic field and determined the gas-dynamic parameters of this process. Most gasdynamic results were obtained with the use of the heat-source model according to which the absorption of electromagnetic energy is modeled by heat release with a specified intensity distributed over a finite region of the flow. Georgievskii and. Levin [7] considered the linear formulation of the problem and showed that the energy supply at the segment in front of a narrow axisymmetric body is highly efficient for wave-drag reduction. These researches also showed [8] that the flow field can be drastically changed and the wave drag can be decreased by supplying a small amount of energy in a local zone upstream of the blunted body. The effect of local energy supply on the wave drag of axisymmetric sharp and blunt bodies of various configurations was studied in [9][10][11][12]. The occurrence of separation zones and considerable reduction (up to 50%) in the wave drag were observed. The energy saved was found to exceed manyfold the energy consumed.Inviscid spatial flows with energy supply upstream of simple-shaped bodies were studied in [13][14][15]. The results obtained support the fact that the lift force and stalling torque can be changed by the energy supplied to the incoming flow. Levin et al. [15,16] calculated a supersonic flow of a viscous heat-conducting gas around a spherically blunted body. An analysis of these data shows that the drag can be significantly reduced even for rather low values of heat-supply intensity; in this case, the thermal load increases insignificantly.In this paper, we give results of a numerical analysis of a supersonic axisymmetric air flow near the front part of a sphere in the presence of a heat source in the incoming flow. The calculations are performed

Review of wave drag reduction techniques: Advances in active, passive, and hybrid flow control

“…However, the blunt body has a larger effective time as compared to the sharp one because the recirculation regions exist for a longer time in the vicinity of the forebody. 263 Levin et al 264 did a parametric study of the spherical blunt body in supersonic flow by depositing energy source. Reduction in drag is maximum by increasing energy power until a threshold value.…”

“…Levin et al 264 did a parametric study of the spherical blunt body in supersonic flow by depositing energy source. Reduction in drag is maximum by increasing energy power until a threshold value.…”

Flows of real gas in nozzles with unsteady local energy supply

“…Its properties are described by three constants, which allows for ja generalized analysis of the influence of dissociation. In the model developed in [18], air is considered as an ideal mixture of oxygen and nitrogen (it is assumed that there are no nitrogen compounds with oxygen) with constant molar concentrations, taking into account the excitation of vibrational and rotational degrees of freedom of molecules. The average molar mass of the mixture remains constant, and the equation of state retains the form corresponding to the equation of state of an ideal gas.…”

Reduction of drag and energy consumption during energy release preceding a blunt body in supersonic flow

“…A number of numerical calculations have been performed recently of supersonic flow past the region of energy release [4][5][6][7] and of flow past bodies of different shapes in the presence of a source of energy preceding these bodies and of drag reduction [8][9][10][11][12][13]. Experiments were also performed with laser [14] and microwave pulses and discharges for initiating energy release, as a rule, at low values of Mach number and average power.…”