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空心阴极作为电推力器的核心部件之一,其放电等离子体特性对空心阴极的性能和可靠性具有决定性的作用。采用实验的方法,使用朗谬尔静电探针置于钡钨空心阴极放电出口处,诊断和分析了钡钨空心阴极出口处的放电等离子体特性随阴极推进剂流量和放电电流的变化规律,结果表明:阴极推进剂流量和放电电流对空心阴极放电等离子体特性具有比较明显的影响,各等离子体参量随阴极推进剂流量和放电电流均有明显的变化,其中,电子数密度随阴极推进剂流量和放电电流的增大而上升,等离子体电势随阴极推进剂流量和放电电流的增大而下降,电子温度随阴极推进剂流量的增加而下降,随放电电流的增大有略微升高,而且,放电电流对放电等离子体特性具有更显著的影响。
Hollow cathode, as one of the core components of electric thrusters, has its discharge plasma characteristics decisive for the performance and reliability of hollow cathode. An experiment was conducted using Langmuir electrostatic probe placed at the outlet of barium-tungsten hollow cathode discharge. The discharge plasma characteristics at the outlet of barium-tungsten hollow cathode were diagnosed and analyzed with the variation of cathode propellant flux and discharge current. The results The results show that the cathode propellant flow rate and discharge current have a significant effect on the characteristics of the hollow cathode discharge plasma. The plasma parameters vary significantly with the cathode propellant flow rate and discharge current. The electron density varies with the cathode propellant flow rate And the discharge current increases. The plasma potential decreases with the increase of the cathode propellant flux and discharge current. The electron temperature decreases with the increase of the cathode propellant flux, slightly increases with the increase of the discharge current, and , The discharge current has a more significant effect on the discharge plasma characteristics.