脉冲等离子体推力器的性能分析

脉冲等离子体推力器(PPT)的性能受多方面因素的影响,包括放电参数以及推力器本体结构等。通过对脉冲等离子体推力器的工作原理和物理学模型的分析,研究了PPT的效率、比冲、推力、元冲量、推功比等性能参数与电极结构、电气参数的关系,并设计了实验,对效率、比冲、元冲量等与放电能量、电极间距的关系进行了验证。结果表明,效率、比冲、元冲量均随放电能量的提高而增大,元冲量在电极间距为50 mm时大于间距为30 mm、40 mm时的值。根据实验结果,提出了设计高性能PPT的一些优化条件,对PPT的设计有参考意义。

Performance analysis of pulsed plasma thruster

The performance of pulsed plasma thruster(PPT) is impacted by many factors,including discharge parameters and the thruster structure.This fundamentals of PPT and its physical model were analyzed,relation between the parameters and the performances were provided.An experiment was designed to validate the relations among thrust efficiency,specific and impulse bit and discharge energy,electrode gap.The results showed that the thrust efficiency,specific impulse and impulse bit were all improved when the discharge energy increased.The impulse bit was larger when the electrode gap was 50 mm than that when the electrode gap was 30 mm,40 mm.Based on the experiment,some optimized condition was proposed as for the referrence in PPT designing.