Conditions of simulation of stagnation point heat transfer from a high-enthalpy flow

Abstract

The problem of local simulation of stagnation point heat transfer to a blunt body is solved within the framework of boundary layer theory on the assumption that the simulation subsonic high-enthalpy flow is in equilibrium outside the boundary layer on the model, while the parameters of the natural flow are in equilibrium at the outer edge of the boundary layer on the body. The parameters of the simulating subsonic flow are expressed in terms of the total enthalpyH 0, the stagnation point pressurep w and the velocityV 1 for the natural free-stream flow in the form of universal functions of the dimensionless modeling coefficientsξ=R m * /R b * (ξ ≤ξ.<1),ζ=V 1/√2H 0 ξ (ζ ≤ ζ.<1) whereR m * and R b * are the effective radii of the model and the body at their stagnation points. Approximate conditions for modeling the heat transfer from a high-enthalpy (including hypersonic) flow to the stagnation point on a blunt body by means of hyposonic (M≪1) flows, corresponding to the case ζ2≪1, are obtained. The possibilities of complete local simulation of hypersonic nonequilibrium heat transfer to the stagnation point on a blunt body in the hyposonic dissociated air jets of a VGU-2 100-kilowatt induction plasma generator [4, 5] are analyzed.