脉冲等离子体推力器电离机制数值分析  

Numerical Analysis on the Ionization Mechanism of Pulsed Plasma Thrusters

作　　者：黄天坤[1] 武志文[1] 刘向阳[1] 谢侃[1] 王宁飞[1] 成跃[1] 

机构地区：[1]北京理工大学宇航学院,北京100081

出　　处：《高电压技术》2015年第9期2958-2964,共7页High Voltage Engineering

基　　金：高等学校博士学科点专项科研基金(20121101120004)~~

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电离情况的模拟;PPT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。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 m3（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 not always meet the ionization threshold value of neutral gas during the discharge process of PPT.

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 

分 类 号：V439.2[航空宇航科学与技术—航空宇航推进理论与工程]