THERMOCHEMICAL BEHAVIOR AND HEAT TRANSFER IN HYPERSONIC THERMAL BOUNDARY LAYER WITH HIGH-ENTHALPY DISSOCIATED CARBON-OXYGEN GAS MIXTURE
A finite-rate surface thermochemical model involving the surface catalysis and ablation was developed for high-enthalpy dissociated gas flow and implemented into the three-dimensional compressible Navier-Stokes solver for multi-species chemical reaction system. Numerical simulation for high-enthalpy dissociated carbon-oxygen gas mixture was performed to investigate the thermochemical behavior and heat transfer in hypersonic thermal boundary layer. The thermochemistry analysis found that the thermal boundary layer is dominated by surface reactions and near-wall diffusion, generally depending on the balance of the levels of the reaction rate and diffusive transport speed. The reactions in thermal boundary layer and their interaction have significant influences on the aerodynamic heating, which rely largely on the thermal protection materials and should be seriously considered.