10微克级液体脉冲等离子体推力器供给系统研究

10 Micrograms Supply System for Liquid Propellant Pulsed Plasma Thruster

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%。

Using water as propellant,which could effectively increase the specific impulse,prevent latetime ablation and reduce pollution,was a new technology to improve the performance of pulsed plasma thruster（PPT）. As the prerequisite of pushing the liquid propellant pulsed plasma thruster（LP-PPT） into engineering application,the trace propellant supply system was difficult to satisfy the needs of LP-PPT. Therefore,first of all,the existing LP-PPT supply systems were introduced. And their strengths and weaknesses were analyzed.Secondly,the cork,organic material,was used as osmotic media. Subsequently a multi-section infiltration water supply system was developed. Thirdly,based on the theoretical analysis of the supply principle,two sets of measurement plans were designed. And the related experiments were carried out. Finally,combined with the PPT,the performances of LP-PPT were tested. It is found that the mass flow rate of three-section supply system is 21.76μg/s,which is able to meet the requirement of LP-PPT prototype. The performances of LP-PPT is acquired. The impulse bit,specific impulse and efficiency are 82.998μN·s,194.6s and 2.47%,respectively.