针对卫星变轨发动机工作时高空羽流污染问题 ,从分子运动论出发 ,采用直接模拟MonteCarlo(DSMC)方法对轴对称羽流场进行模拟 ,发动机喷管出口参数采用内流计算的给定值。首先对计算方法进行了验证 ,然后通过计算给出羽流场压力、密度等参数 ,给出计算位于回流区内的卫星表面敏感部件的羽流污染量的方法 ,并进行了计算。 Aiming at the problem of high altitude plume pollution in satellite orbit operation, starting from the molecular motion theory, direct simulation MonteCarlo (DSMC) method was used to simulate the axial symmetry plume field. The engine nozzle outlet parameters were given by the inflow calculation. Firstly, the calculation method is verified. Then the parameters of plume pressure and density are given, and the method to calculate the plume pollution of the satellite surface sensitive components in the recirculation zone is given and calculated.