Cathode erosion site distributions in an applied-field magnetoplasmadynamic thruster  

作　　者：Peng WU Yibai WANG Yong LI Baojun WANG Kaiyu ZHANG Haibin TANG Jinbin CAO 吴鹏;王一白;李永;王宝军;张凯宇;汤海滨;曹晋滨(School of Astronautics,Beihang University,Beijing 100191,People's Republic of China;Beijng Institute of Control Engineering,Beijing 100190,People’s Republic of China;School of Space and Environment,Beihang University,Beijing 100191,People's Republic of China;Key Laboratory of Spacecraft Design Optimization&Dynamic Simulation Technologies,Ministry of Education,Beijing 100083,People’s Republic of China;Laboratory of Space Environment Monitoring and Information Processing,Ministry of Industry and Information Technology,Beijing 100083,People's Republic of China)

机构地区：[1]School of Astronautics,Beihang University,Beijing 100191,People's Republic of China [2]Beijng Institute of Control Engineering,Beijing 100190,People’s Republic of China [3]School of Space and Environment,Beihang University,Beijing 100191,People's Republic of China [4]Key Laboratory of Spacecraft Design Optimization&Dynamic Simulation Technologies,Ministry of Education,Beijing 100083,People’s Republic of China [5]Laboratory of Space Environment Monitoring and Information Processing,Ministry of Industry and Information Technology,Beijing 100083,People's Republic of China

出　　处：《Plasma Science and Technology》2020年第9期59-65,共7页等离子体科学和技术（英文版）

基　　金：supported by the Fundamental Research Program(No.11872093)。

摘　　要：Erosion can influence cathode life,and is thus considered to be one of the main factors limiting the application of applied-field magnetoplasmadynamic thrusters.In this paper,erosion sites on graphite cathodes are studied so as to identify the influence of applied magnetic field and the ratio of propellant mass flow rate supplied from cathode and anode.The experiment results show that the application of applied magnetic field can significantly reduce the erosion rate of the cathode compared to that without magnetic field.The erosion sites on the cathode vary with the relative position of the convergent-divergent magnetic field,and are mainly distributed in the divergent part of the field.The erosion sites on the cathodes are found to be related to the propellant supply.The decreasing anode mass flow rate enlarges the range of erosion.These results are much helpful for the analysis of cathode erosion site location since they provide evidences of erosion mechanisms and point out the directions for further research.

关 键 词：electric propulsion applied-field magnetoplasmadynamic thruster cathode erosion magnetic field propellant mass flow rate 

分 类 号：V439.2[航空宇航科学与技术—航空宇航推进理论与工程]