背景压强对电推进羽流场影响的数值模拟  

Numerical simulation of effect of background pressure on electric propulsion plume field

作　　者：翁惠焱 蔡国飙[1,2] 郑鸿儒[3] 刘立辉 张百一[1,2] 贺碧蛟[1,2] WENG Huiyan;CAI Guobiao;ZHENG Hongru;LIU Lihui;ZHANG Baiyi;HE Bijiao(School of Astronautics,Beihang University,Beijing 100083,China;Key Laboratory of Spacecraft Design Optimization&Dynamic Simulation Technologies,Ministry of Education,Beihang University,Beijing 100083,China;Chang Guang Satellite Technology Co.,Ltd.,Changchun 130000,China)

机构地区：[1]北京航空航天大学宇航学院,北京100083 [2]北京航空航天大学航天器设计优化与动态模拟技术教育部重点实验室,北京100083 [3]长光卫星技术股份有限公司,长春130000

出　　处：《北京航空航天大学学报》2022年第10期1854-1862,共9页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金(51977003)。

摘　　要：真空舱内背景压强是电推力器地面试验过程中影响工作性能评估和羽流场参数诊断的重要参数。针对LIPS-200型离子推力器羽流场参数的数值仿真中采用的背景压强建立方法进行了仿真分析。仿真中采用混合粒子网格(PIC)方法和直接模拟蒙特卡罗(DSMC)方法处理羽流场中等离子体运动和粒子间碰撞,分别采用虚拟粒子和计算粒子建立压强的方式,对电推进羽流场进行了数值模拟,并与绝对真空环境进行对比分析。结果表明:背景压强的存在导致中性粒子和电荷交换离子数密度较绝对真空环境高1个量级以上。虚拟粒子可大幅提高计算效率,获得的流场中电荷交换离子分布与计算粒子结果相近,但中性粒子分布相差较大,虚拟粒子无法表征壁面及真空泵的影响。The background pressure in vacuum chamber is an important parameter that affects the per-formance evaluation and plume field parameter diagnosis of electric thruster during ground tests.In this paper,a simulation analysis was made on the background pressure establishment method used in the numerical simu-lation of the plume field parameters of LIPS-200 ion thruster.The hybrid particle in cell(PIC)method and the direct simulation Monte Carlo(DSMC)method were used to deal with plasma motion and particle colli-sions in plume field.The electric propulsion plume was numerically simulated by using virtual particles and computed particles respectively,and compared with the vacuum environment.The results show that the num-ber densities of neutral particles and charge-exchange ions are more than one order of magnitude higher than those in the vacuum environment due to the existence of background pressure.The virtual particles can greatly improve the computational efficiency,and the charge-exchange ion distribution in the plume field obtained is similar to that of the computed particle.However,the neutral particle distribution is quite different,so the in-fluence of the wall and vacuum pump cannot be characterized by virtual particles.

关 键 词：电推进 羽流 背景压力 粒子网络-直接模拟蒙特卡罗(PIC-DSMC)方法 数值模拟 

分 类 号：V439[航空宇航科学与技术—航空宇航推进理论与工程]