Numerical Simulation of Hypersonic Reentry Flow Field with Gas-phase and Surface Chemistry Models

For the chemistry reactions of hypersonic reentry flow field, this paper focuses on combinations of the gas-phase chemistry models and the surface models. Two chemistry models named 20-species,40-reaction and 19-species,44-reaction were used to simulate the gas-phase chemistry process of hypersonic flow field in this paper; And two popular finite-rate reaction models, the Park model and the Zhluktov & Abe (ZA) model, were applied to characterize surface reactions at the wall of aircraft. In order to investigate the differences between the two gas-phase models with surface models for predicting the species distribution, six combinations were designed to characterize the chemistry reactions of reentry flow field. Results indicate that the combination of 44-reaction and Park surface chemistry model is most stable and efficient for simulation. There are two methods used to calculate the mass loss rates of ablating materials in the fluid-solid interaction. The differences of mass loss rates between the two methods were obtained by embedding the two methods into the finite element thermodynamic analysis. According to the results, the numerical differences range from 14.3% to 35.2%.