Effects of Mass Transfer and Chemical Nonequilibrium on Slender Blunted Cone Pressure and Heat-Transfer Distributions at M = 13.2

摘要

The effects on the pressure and heat-transfer distributions of injecting helium and argon into an air laminar boundary layer over a spherically blunted 7.5-deg half-angle cone at M = 13.2 and Re/in. = 1520 were considered. Calculations are presented for a binary perfect gas boundary layer including transverse curvature and displacement effects, an ionizing air nonequilibrium boundary layer without higher-order effects, and a nonequilibrium stagnation point thin viscous shock layer model. The effects of inviscid chemical equilibrium and nonequilibrium external conditions and wall catalyticity were investigated. Neglecting all higher-order effects, comparison of binary gas and ionizing air boundary-layer results showed reasonable agreement. Strong effects of inviscid chemical nonequilibrium on stagnation point heat transfer were found. Arguments are given for using inviscid nonequilibrium stagnation conditions rather than the usual chemical equilibrium conditions for nonequilibrium boundary-layer calculations. (Author)