建立基于混合网格的流场求解方法模拟钝头体双轨双排火箭撬试验粘性流场,并与钝头体自由流状态进行对比结果表明:下表面由于地面效应作用压力大于自由流状态;随着马赫数增大,高压区范围变大,压力最大点位置向后移动,与自由流状态对比的增压现象越来越明显。钝头体底部受地面效应和其他试件的影响,一对尾涡出现强烈的不对称性引起压力不对称分布。因此,建议将传感器布置在远离地面的钝头体上部0.2<x/L<0.4的区域。

Blunt rocket sled experimental model with two-tracks and two ranks of vehicles was numerically simulated based on un-structured grids. The results were compared with free-stream situation of blunt. It is showed that there is a higher pressure domain at the low surface of blunt in experimental model. The pressure becomes bigger and the point of the highest pressure of low surface moves backward as the Mach number raising. Trailing vortices of blunt are unsymmetrical in experimental model because of the ground effect and the interaction effects. On the whole, it is suggested that the sensor be installed away from ground where 0.2<x/L<0.4.