钝体化学非平衡粘性流数值模拟

NUMERICAL SIMULATION OF NON EQUILIBRIUM FLOW AROUND A BLUNT BODY

用有限差分法求解ＮＳ方程，数值模拟了二维钝楔头部和近尾迹非平衡化学反应流场。模拟条件为Ｍａ∞＝２５，飞行高度ｈ＝７０ｋｍ，半楔角θ＝２０°，钝度比为０６０；气体组分为７个组元，共１１个化学反应式。头部流场结果与已有计算结果符合较好。在Ｍａ∞＝２５条件下，底部近尾迹较大区域内具有较高的温度和较大的电子密度，且下降趋势缓慢。

Non equilibrium flow at Ma ∞=25,h =70km around a whole two dimensional blunt wedge is numerically simulated by finite difference method with sloving N S equations.The half wedge angle is 20°,and bluntness is 0 60. The gas model consists of seven species,with eleven chemical reactions considered. Firstly,the results on the nose are compared with existing calculations,and good agreement is obtained.Then the results in the near wake are given. At Ma ∞ =25,the temperature is still high and the electron number is still very large in the near wake flow.