【摘要】 火星探测器在高超声速进入飞行段处于高温碳氧环境中,CO₂及其离解产物在近壁面发生扩散、吸/解附和结合等复杂的壁面热化学行为和催化放热过程。这些壁面现象与地球大气氮氧环境有显著差异,且对高超声速气动热的精确预测有重要的影响。考虑壁面有限速率催化作用下近壁面原子/分子结合为CO₂和O₂的反应过程,基于Eley-Rideal催化反应机理,建立描述近壁面热化学行为和催化效应的壁面有限速率反应模型。基于该壁面模型,开展了高超声速化学非平衡气动加热数值模拟,获得的有限速率催化加热量更接近于风洞实验数据。通过多种吸附和催化反应共同作用下的参数化分析,获得了各吸附和催化反应对非平衡气动加热的影响规律。更多还原

【Abstract】 The Mars probe enters into the high-temperature carbon and oxygen gas environment in its hypersonic entry stage. The complex wall thermochemical behaviors and catalytic exothermic processes of CO₂ dissociating products occur on the surface, which has an important impact on the accurate prediction of hypersonic aerodynamic heating. Considering the recombination of near-wall particles into carbon dioxide and oxygen molecules, a finite-rate reaction model was established based on the Eley-Rideal catalytic mechanism, describing the near-wall thermochemical behavior and catalytic effect. The obtained finite-rate catalytic aerodynamic heating based on this model was closer to wind tunnel data. Parametric analysis under various adsorption and catalysis reactions indicates the significant impacts of surface adsorption and catalysis on the non-equilibrium aerodynamic heating.更多还原