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用水作为脉冲等离子体推力器(PPT)的推进剂是改进其性能的新思路,可以有效提高比冲、防止滞后烧蚀以及降低污染。但微量推进剂供给系统是实现液体脉冲等离子体推力器(LP-PPT)的前提条件,也是LP-PPT的难点。为此,先介绍了现有的LP-PPT供给方式,并分析各种供给方式的优缺点;以有机材料软木为渗透介质,研制了多段渗透式水推进剂供给系统;在理论分析供给原理的基础上,设计了两套供给量测量方案,并开展了相应的测量实验;将供给系统安装于PPT样机本体,开展了性能测试实验。结果表明三段结构供给系统供给量为21.76μg/s,满足LP-PPT样机的供给量需求。最终获得LP-PPT实验样机元冲量82.998μN·s,比冲194.6s,效率2.47%。
Water as a propellant for pulsed plasma thrusters (PPT) is a new way to improve its performance, which can effectively improve specific impulse, prevent lag ablation and reduce pollution. However, the micro-propellant supply system is a prerequisite for the realization of liquid pulse plasma thruster (LP-PPT), which is also the difficulty of LP-PPT. For this reason, the existing supply ways of LP-PPT are introduced firstly, and the advantages and disadvantages of various supply modes are analyzed. The multi-stage infiltration water propellant supply system is developed by using the organic material cork as the permeating medium. Based on the theoretical analysis of the supply principle On the basis of this, two sets of measurement schemes of supply were designed and the corresponding measurement experiments were carried out. The supply system was installed on the prototype of PPT and the performance test was carried out. The results showed that the supply of three-stage structure supply system was 21.76μg / s, which satisfied the supply demand of LP-PPT prototype. Finally, LP-PPT experimental prototype element impulse 82.998μN · s, specific impact 194.6s, efficiency 2.47%.