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以机械展开式再入飞行器为研究对象,采用DSMC(直接蒙特卡洛模拟)方法计算分析了其在稀薄大气环境下的气动特性。讨论了飞行器在不同高度下的流场特性和升阻及配平特性,结果表明飞行器流场及受力特性对大气稀薄程度显示出较强的敏感性;进一步分析了连续流过渡至稀薄大气下飞行器的阻力系数,得出了随着来流Knudsen数增加,大气稀薄效应逐渐显现,传统的CFD方法已不再适用于描述流动特征的结论,同时给出了依据来流Knudsen数大小采取CFD和DSMC方法分别进行计算分析的建议。
Taking the reentry vehicle with mechanical deployment as the research object, the aerodynamic characteristics of the aircraft under lean and atmospheric conditions were calculated and analyzed by the DSMC (direct Monte Carlo simulation) method. The characteristics of the flow field and drag-and-drop and trim at different altitudes are discussed. The results show that the flow field and the force characteristics of the aircraft show a strong sensitivity to the atmospheric leanness. The further analysis of the continuous flow transition to a lean atmosphere The results show that with the increase of Knudsen number, the levitation effect of atmosphere appears gradually, and the traditional CFD method is no longer suitable for describing the flow characteristics. At the same time, it is given that CFD and DSMC Methods were calculated and analyzed separately.