Two-phase mass injection from the stagnation zone of a blunt body in a hypersonic flow

Abstract

A mathematical model of the hypersonic steady gas flow over the stagnation zone of an axisymmetric blunt body ~Mth given twophase injection from the surface is proposed. The two-continuum model of a dusty gas [3] is used for describing the flow in the region of the walt. The problem is solved in the boundary layer and thin viscous shock layer approximations. On the basis of the numerical calculations the distribution of the parameters of the carrier and dispersed phases near the axis of symmetry is obtained. The similarity parameters determining the convective heat transfer are found. The stagnation point heat fluxes w~th and without particles are compared. The range of parameters on which particles can significantly reduce the heat transfer is determined. Research into the thermal erosion behavior of various materials in high-enthalpy gas flows and, moreover, the development of new active thermal protection techniques [1--3] make it necessary to investigate the effect on the thermal load of dispersed particles introduced into the flow from the body surface. In the above-mentioned applications a mixture of gas and disperse particles, which then move in a narrow region near the wall, is injected from the surface. Two-phase injection into a supersonic flow without allowance for the viscosity and thermal conductivity of the carder phase was previously considered in [4]. The influence of particles on the flow in the boundary layer without injection effects was investigated in [5, 6].