高超声速三维热化学非平衡流场的数值计算对比研究

选取国内外典型的高超声速绕流实验,对比研究了不同化学反应模型(Dunn-Kang模型、Park85模型、Park93模型、Park2001模型、Gupta模型)对高超流动计算结果的影响。重点采用Park双温度模型开展热化学非平衡效应的模拟研究,并同时与5组元单温度模型的计算结果进行了对比。研究表明:Park85-7组元双温度模型与实验结果吻合最好,结果最为可靠;而Park85-5组元单温度模型更适用于工程计算。

A comparative study of the computation of 3-D hypersonic flow in thermochemical nonequilibrium state

The influence of the chemical kinetic model selection on the computation of the hypersonic flow in the thermochemical nonequilibrium state is examined, with consideration of several different chemical reaction models (the Dunn-Kang model, the Park85 model, the Park93 model, the Park2001 model, and the Gupta model). Typical experimental results at home and aboard are used to identify the reliable model. The thermal nonequilibrium processes in the gas are accounted in the Park''s two temperature model. Cases are computed using five species, and one temperature model is used for comparison. It is shown that the Park85-7 species-two temperature model gives the best results, as compared to experiment data. On the other hand, the Park85-5 species-one temperature model is more suitable for engineering applications.