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为研究地外天体起飞真空羽流对探测器分离产生的力热扰动,使用计算流体力学-直接模拟蒙特卡洛(CFD-DSMC)耦合计算模型对锥面导流的真空羽流场进行了计算。采用组分输运模型计算三维连续流场,并获取当地的克努森数作为判断连续流和离散流的依据。使用基于分子动力学的直接模拟蒙特卡洛方法(DSMC)计算离散流场,采用可变软球(VSS)碰撞模型和Larsen and Borgnakke传能模型计算离散流分子间的能量传递,将计算结果与试验进行了对比,验证了计算方法的可靠性。研究结果表明,A器受到的侧向干扰力矩为62N·m,底部受到的最大压力为100Pa,最大热流密度为100k W/m2;B器受到的侧向干扰力矩为558 N·m,表面最大压力为8k Pa,最大热流密度为600k W/m2,喷口与导流装置顶面距离为400mm时,激波已移出喷管内部。
In order to study the force-heat disturbance caused by extraterrestrial astronomical vacuum plume on the detector separation, the cone-surface-induced vacuum plume field was calculated by using CFD-DSMC coupled computational model . The component transport model is used to calculate the three-dimensional continuous flow field, and the Knudsen number is obtained as the basis for judging continuous flow and discrete flow. Discrete flow fields were calculated using DSMC (direct simulation Monte Carlo method) based on molecular dynamics, and the energy transfer between discrete flow molecules was calculated using the variable collision of soft-bulb (VSS) model and the Larsen and Borgnakke energy transfer model. The test is compared to verify the reliability of the calculation method. The results show that the lateral interference moment A is 62 N · m, the maximum pressure 100 MPa and the maximum heat flux 100 k W / m2 at the bottom, and the lateral disturbance moment B is 558 N · m with the largest surface The pressure was 8kPa and the maximum heat flux was 600kW / m2. The shock wave had moved out of the nozzle when the distance between the nozzle and the top of the flow guider was 400mm.