NON-STATIONARY EFFECTS IN HYPERSONIC NONUNIFORM DUSTY-GAS FLOW PAST A BLUNT BODY

In the framework of the two-fluid model,a hypersonic flow of anonuniform dusty gas with low inertial(non-depositing)particles around a bluntbody is considered.The particle mass concentration is assumed to be small,so thatthe effect of particles on the carrier phase is significant only inside the boundarylayer where the particles accumulate.Stepshaped and harmonic nonuniformities ofthe particle concentration ahead of the bow shock wave are considered and the corre-sponding nonstationary distributions of the particle concentration in the shock layerare studied.On the basis of numerical study of nonstationary two-phase boundarylayer equations derived by the matched asymptotic expansion method,the effects offree-stream particle concentration nonuniformities on the thermal flux and the frictioncoefficient in the neighborhood of stagnation point are investigated,in particular,themost"dangerous"nonuniformity periods are found.