不同再入高度下高超飞行器流场数值仿真

基于轴对称N-S方程和7组分18化学反应对20~90 km再入高度下RAMC-Ⅱ飞行器周围流场进行数值模拟,并对算法进行验证。计算了电子密度分布,同时给出了不同再入高度下的碰撞频率、平均温度及总压强分布。通过分析得出电子密度随再入高度的增加先增加后减小,同一再入高度下电子密度沿轴向方向减小,沿着垂直于飞行器表面方向符合高斯分布。最大碰撞频率随着再入高度增加而减小,同一再入高度下沿轴向方向减小。同一再入高度下最大平均温度沿着轴向距离逐渐减小。最大总压强随着再入高度的增加而减小,同一再入高度下最大总压强沿着轴向距离逐渐减小。 

Numerical simulation of flow field around hypersonic vehicle at different reentry heights

Based on the axisymmetric N-S equation and the 7-component 18 chemical reaction, the flow fields around the RAMC-Ⅱ vehicle at the reentry height between 20 km to 90 km were numerically simulated and the algorithm was verified. Not only was the electron number density distribution calculated, but also the collision frequency, average temperature and total pressure distribution at different reentry heights were given. The analysis showed that the electron number density inecreased first and then decreased with the increasing reentry height. When the reentry height was constant, the electron number density decreased with the axial direction, and the Gaussian distribution was consistent along the direction perpendicular to the surface of the vehicle. The maximum value of collision frequency decreased with the increase of the reentry height. When the reentry height was constant, the collision frequency decreased in the axial direction. The maximum average temperature at the same reentry height gradually decreased with the axial distance. The maximum total pressure decreased with the increase of reentry height, and the maximum total pressure decreased with the axial distance at the same reentry height.