Then,the flowfield of nozzle exit vicinity and backflow region are calculated by using DSMC method,The results show that with this method,the flow property of this region can be accurately described.

• 本文分析了高空羽流流场的特性，论述了DSMC方法的原理以及涉及到的关键技术，应用DSMC方法数值求解了喷管出口附近及倒流区流场。