喷流制冷的高超声速后台阶流场气动光学效应研究

近年来,临近空间的军事应用价值受到了越来越多的关注。为了研究高超声速飞行器典型后台阶结构的气动光学问题，采用研究稀薄气体动力学的直接模拟蒙特卡洛算法(DSMC)研究了临近空间不同喷流控制下的后台阶流动特性，并采用光线追踪方法研究了不同流动控制下流场的气动光学效应。计算结果表明，随着飞行高度增加，壁面热流将增加，同时气动光效应将变弱。在四种喷流冷却方式中，喷流方式A的冷却效果最好，同时没有增加气动光学效应，B、D方式具有一定的冷却效应，但使得气动光学效应更加严重。

Aero-Optical Effects of Hypersonic Backward Facing Step with Film Cooling

In recent years, the military application value of near space has received more and more attention. In order to study the aero-optical problems of the typical backward step structure of hypersonic aircraft, the direct simulation monte carlo(DSMC) method, which is a simulation method of rarefied gas dynamics, is used to study the flow characteristics of the backward step under different jet control in near space, and the ray-tracing method is used to study the aero-optical effect of flow field under different flow control. The calculation results show that as the flying height increases, the temperature of wall increases, and the aero-optical effect becomes weak. Among the four jet cooling methods, jet method A has the best cooling effect without increasing the aero-optical effect. Method B and D have certain cooling effects but make the aero-optical effect more serious.