A THERMALLY NONEQUILIBRIUM VISCOUS SHOCK LAYER PAST SLENDER BLUNTED CONES

Physical-chemical processes in a shock layer past a slender sphericall y blunted body at high supersonic velocities are investigated. Using a gas-dynamic model, defined by the complete viscous shock-layer equati ons [1], the steady laminar axisymmetric flow of viscous, hear-conduct ing, partially dissociated and ionized air under chemical and thermal non-equilibrium is considered throughout the region between the body a nd the required thin shock wave. Attention is concentrated on the non- equilibrium chemical, ionization, and relaxation kinetics at large dis tances from the leading stagnation point. Multicomponent diffusion and the reverse influence of dissociation-recombination on the relaxation of vibrational quantum states, i.e, coupling vibration-dissociation-v ibration (CVDV), are taken into account. A new model is used to descri be dissociation-relaxation process [2]. The model includes the effect of non-equilibrium excitation of vibrations and the equilibrium excita tion of rotational molecular modes on the dissociation rate constants. Comparisons with experimentally verified calculations and calculation s within the scope of the chemically equilibrium full viscous shock-la yer model indicate that the model is physically adequate. The calculat ions highlighted physical effects in the non-equilibrium viscous shock layer past a slender spherically blunted cone at various distances fr om the stagnation point.