1 mN射频离子推力器参数与性能分析

射频离子推力器是空间电推进的一种,其推力性能是系统设计的核心问题。为获得推力特性随设计参数的变化规律,采用数值计算方法进行了研究,开展了1 mN射频离子推力器设计计算,对不同放电室尺寸、流量、射频功率、屏栅电压下的推力性能进行了分析并进行了工况优化。结果表明,模型能够正确地描述射频离子推力器性能变化规律,放电室内径25 mm的推力器即可以实现1 mN推力指标,在最优工况下,推力器推力1.176 mN,比冲2503 s,效率53.13%,满足设计要求。根据该模型研制的推力器样机成功点火,验证了数值模型的有效性,可以利用该模型为射频离子推力器研制工作提供指导。

Parameters and performance analysis of 1 mN RF ion thruster

RF ion thruster(RIT)is a kind of electric propulsion,and the thrust performance is the core issuse of propulsion system design.Numerical calculation method was used to obtain the thrust characteristic with design parameters.The design of a 1 mN RIT was carried out,thrust performance of different discharge chambers,mass flowrates,rf power and screen voltage were analyzed and the working condition was optimized.The results show that the model can correctly describe the performance variation law of RIT,and thrust of the RIT with a discharge chamber of 25 mm inner diameter can reach 1 mN.Under the optimal working condition,thrust 1.176 mN,specific impulse 2503 s and efficiency 53.13%can be achieved,which meets the design requirements.The thruster prototype developed according to the model was ignited successfully,which fully verified the effectiveness of the numerical model,the numerical model can be used to guide further research.