Coupling simulation of convective heat transfer characteristics and new idea for hot-wall correction considering non-equilibrium effects

The interaction between high-enthalpy/chemical-nonequilibrium flow and surface materials brings complex coupling convective heat transfer characteristics, leading to weak applicability of hot-wall correction method (HWC) for rapid evaluation of aerodynamic thermal environment. In view of the above problems, this paper deals with HWC improvement via coupling numerical simulation of catalytic heating on carbon-based materials in carbon-oxygen dissociation environment. On the basis of the numerical simulation of hypersonic aerodynamic heating/structural heat transfer interaction, the chemical non-equilibrium effect and the interface high-temperature chemical effect were deeply analyzed. The coupling results show that the linearity of wall chemical heatflux and temperature is weakened due to interface thermochemistry, while the temperature-gradient part maintains high linearity. Accordingly, a new idea to improve HWC was proposed by decomposing the contribution of heatflux into two physical processes: one obeying the conventional HWC, and the other independent of boundary layer profiles. In-depth analysis shows that the latter can be simply dealt with by computing reaction rates from chemistry mechanism, eliminating the need for full CFD/CHT coupling computation. © 2020, Editorial Board of CIESC Journal. All right reserved.