Ion thruster accelerator grid erosion mechanism under extreme conditions of cylindrical erosion and chamfer erosion  

作　　者：Guangqing XIA Jiahui LI Chang LU Hai GENG Vladimir A.SAETCHNIKOV Juan LI Yanlong WANG 

机构地区：[1]State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,Dalian University of Technology,Dalian 116024,China [2]Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province,Dalian University of Technology,Dalian 116024,China [3]Collaborative Innovation Center of Micro&Nano Satellites of Hebei Province,North China Institute of Aerospace Engineering,Langfang 065000,China [4]Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 73000,China [5]Physics and Aerospace Technology Department,Belarusian State University,Minsk 220030,Belarus

出　　处：《Chinese Journal of Aeronautics》2023年第6期128-139,共12页中国航空学报（英文版）

基　　金：supported by the National Key R & D Program of China (No. 2020YFC2201100);the National Key R & D Program for Intergovernmental International Scientific and Technological Innovation Cooperation, China (No. 2021YFE0116000);the National Natural Science Foundation of China (Nos. 12175032, 12102082, 12275044, 12211530449);the Fundamental Research Funds for the Central Universities of China (Nos. DUT21GJ206 and DUT22QN232);the S & T Program of Hebei, China (Nos. YCYZ202201, 216Z1901G and 206Z1902G);the S & T Innovation Program of Hebei, China (Nos. SJMYF2022X18 and SJMYF2022X06);the Advanced Space Propulsion Laboratory of BICE and Beijing Engineering Research Center of Efficient and Green Aerospace Propulsion Technology, China (No. Lab ASP-2020-06);the Funded by Science and Technology Project of Hebei Education Department, China (No. ZC2023144)

摘　　要：In this paper,the abnormal experimental phenomenon on barrel erosion under extreme working conditions in the ultra-long life experiment(>10000 h)of ion thruster ion optics is studied by the Immersed-Finite-Element Particle-In-Cell Monte-Carlo-Collision(IFE-PIC-MCC)method and the grid erosion evaluation model.The transport process of beam ions and Charge Exchange(CEX)ions in the grid system,and the characteristics and mechanisms of the aperture barrel erosion under extreme erosion conditions(i.e.the cylindrical erosion and chamfer erosion)were systematically studied.Thanks to the advantage of the IFE method for dealing with complex boundaries in structured mesh,the aperture barrel erosion morphology of the accelerator grid is reconstructed accurately based on the experimental results.The results show that,with the evolution of working conditions,the mechanism of the aperture barrel erosion changes significantly,which relies heavily on the accelerator grid morphology.The change of the accelerator grid aperture barrel morphology has a significant effect on the behavior of CEX ions,and only affects the local electric field distribution,but has no effect on the upstream plasma sheath.As the erosion progresses,the erosion position moves downstream along the grid aperture axis direction,and the erosion range becomes narrower.Regardless of the erosion phase,the erosion rate of the CEX ions located downstream of the decelerator grid is the largest.The erosion rate is related to the mean incident energy and angle,and their variation is closely related to the position and trajectory of CEXions.

关 键 词：Accelerator grid Charge Exchange(CEX)ions EROSION IFE-PIC-MCC Ion propulsion 

分 类 号：V439.1[航空宇航科学与技术—航空宇航推进理论与工程]