脉冲等离子体推力器电离机制数值分析.PDF

第 41 卷 第 9 期：2958-2964 高电压技术 Vol.41, No.9: 2958-2964 2015 年 9 月 30 日 High Voltage Engineering September 30, 2015 DOI: 10.13336/j.1003-6520.hve.2015.09.019 脉冲等离子体推力器电离机制数值分析 黄天坤，武志文，刘向阳，谢 侃，王宁飞，成 跃 100081 （北京理工大学宇航学院，北京 ） 摘 要：为了提高脉冲等离子体推力器(pulsed plasma thrusters, PPT)的推进剂利用率和总效率，深入研究推力器的 物理机理，建立了能模拟 PPT 工作时中性气体电离过程的模型，并以 LES-6 和 XPPT-1 的PPT 为对象，进行了数 值仿真。结果表明：计算得到 LES-6 和 XPPT-1 的推进剂利用率分别为 16.32%和 81.04%，电子数密度分别为 6.56×1021 m−3 和 5.83×1021 m−3 ，与实验结果相近，能反映出推进剂效率随放电能量增大而增大的趋势，可以用于 PPT PPT 电离情况的模拟； 的推进剂利用率低主要由极板电压和中性气体供给不匹配造成，极板电压无法一直满 足新烧蚀出的中性气体的电离条件。 关键词：脉冲等离子体推力器；中性气体；电离机制；质量流量；推进剂利用率 Numerical Analysis on the Ionization Mechanism of Pulsed Plasma Thrusters HUANG Tiankun, WU Zhiwen, LIU Xiangyang, XIE Kan, WANG Ningfei, CHENG Yue (School of Aerospace Engineering, Beijing Institute of Technology, Beijing100081, China) Abstract ：In order to gain great insight into the working process in pulsed plasma thrusters (PPT), an ionization model was developed in this paper. The ionization processes of LES-6 PPT and XPPT-1 PPT was simulated by use of the ioniza- tion model, and some parameters such as propellant utilization and electron density were obtained. The propellant utilization ratios were 16.32%(LES-6) and 81.04%(XPPT-1), and the electron densities were 6.56×1021 m−3(LES-6) and 5.83×1021 m−3(XPPT-1). The results show that the model can correctly reveal the ionization process of PPT, and the si- mulated values of the propellant utilization and electron density fit well with the experimental values. It is also shown that the electrode voltage can no