MODELING OF THE FLOW AND HEAT FLUXES IN THE FLOW PATH OF A SUPERSONIC DIFFUSER OF HIGH-ALTITUDE TESTBEDS
R.D. Berdov, N.N. Volkov, L.I. Volkova, D.I. Nugumanov
State Scientific Centre "Keldysh Research Center", Moscow, Russia
Keywords: supersonic diffuser, heat flux, flow modeling, separation zone, gas-dynamic tube, combustion product flow, pseudo-shock
Abstract
A gas-dynamic calculation of the thermal loads and flux parameters of a single-phase flow in the duct of a supersonic exhaust diffuser is performed using a commercial numerical simulation code. The computational model and the challenges of calculating heat fluxes in the pseudo-shock region are described. A combined method for calculating heat fluxes is proposed, based on solving the integral relations for the boundary layer in the supersonic flow region and using the derived engineering formulas for the pseudo-shock region. The proposed approach is tested on a small profiled diffuser. Comparison of the calculated and experimental data shows a difference not exceeding 20 %.
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