再入飞行器等离子体预测与气体组分相关性

对一类大钝头再入飞行器,理论分析电子密度预测与气体组分的相关性,使用经验证的数值模拟方法研究化学反应模型对等离子体预测的影响.研究发现:马赫数是影响等离子体预测与气体组分相关性的重要参数,马赫数越高,不同气体组分模型所得电子密度差异越大.气体组分模型对等离子体预测的影响在驻点强压缩区域和身部位置基本一致.对于大钝头再入飞行器,高度H=60 km,马赫数大于23时应该采用11组分化学反应模型.

Plasma Prediction of Reentry Vehicle and Gas Components

Hypersonic flows around a blunt body are studied with numerical simulation and theoretical analysis.Correlations between plasma prediction and gas components are obtained.It shows that it is Mach number which affects the peak number density of electrons.Numerical simulation agrees with theoretical analysis well.Differences between two gas models get greater as Mach number increases.The differences follow same trend at back taper with stagnation region.A 11-species chemical model should be applied to increase accuracy when reentry capsule flight at height of 60 km and Mach number is over 23.