水工质MPT参数设计与性能预估

摘要

In this paper, the basic components and operating principles of water fed microwave plasma thruster （MPT） were introduced, the key MPT parameters were also analyzed, and the performances of MPT were estimated. The results shown that MPT was in the range 350 mN ~ 450 mN with a maximum specific impulse of 3 674 N · s/kg under the design conditions; the rate of mass flow had a obvious influence on the thrust of MPT and a slight on the specific impulse, whose optimum operation point in the experiment was in corresponding to the rate of mass flow of 120 mg/s ; the Mach number along the axis was not affected by the temperature of inlet flow, but the gas velocity in the domain of expansion section of nozzle was affected obviously; the thrust efficiency of MPT could be improved with the increasing of temperature of inlet gas.%介绍了水工质微波等离子体推力器（MPT）的基本组成和工作原理，分析了水工质MPT的重要参数，并对水工质MPT进行了性能预估。结果表明：设计状态下，水工质MPT的推力在350mN-450mN，比冲达3674N·s／kg；流量对MPT比冲的影响较小，对推力的影响比较明显，最佳工作点流量约为120mg／s；沿喷管轴向在喷管的前半部分喷气速度受温度影响较小，但是在喷管的后半部分喷气速度受温度影响明显，且温度越高喷气速度越大、比冲也越高。