Effects of Different Ambient Temperature on Ion Erosion Rate for Triple Grid of 30cm Diameter Ion Thruster

被引：0
|
作者：
Sun M.-M. [1 ]
Geng H. [1 ]
Long J.-F. [2 ]
Yang J.-T. [1 ]
机构：
[1] Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou
[2] School of Nuclear Science and Technology, University of South China, Hengyang
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2020年 / 41卷 / 01期
关键词：
Ambient temperature; Ion erosion rate; Ion thruster; Triple grid;
D O I：
10.13675/j.cnki.tjjs.180759
中图分类号：
学科分类号：
摘要：
In order to obtain the effects of different ambient temperature on the ion erosion rate for the triple grid of a 30cm diameter ion thruster, FEM (finite element method) simulation and test verification are used to obtain the temperature distribution and thermal deformation under thermal equilibrium. Meanwhile, fluid simulation method is used to simulate erosion of the triple grid in different ambient temperature (20℃, -70℃, -120℃, -170℃) and verified by short life time test. The results show that the time for the screen grid to reach temperature equilibrium is almost unchanged. However, it increases significantly for the accelerator grid as the ambient temperature decreases. The comparison error between the thermal simulation results of the screen grid and the accelerator grid with thermal equilibrium test at room temperature results of the thruster is 7% and 5%, respectively. The decrease in ambient temperature causes the hot gap constantly narrowing in the central area and the edge area between the screen grid and the accelerator grid. However, the hot gap in the edge area between the accelerator and the decelerator grid increases as the decreasing of ambient temperature, and the simulation results agree well with test results by video-metrics measurement method. According to the calculation results of aperture radius erosion rate in different ambient temperature, the central area of the accelerator grid and the edge area of the decelerator grid are the main ion bombardment locations. The velocity of the ions bombarding the central area of the accelerator grid is 3 times as that of the ions bombarding the edge, and the velocity of ions bombarding the edge area of the decelerator grid is about 2.5 times as that of the ions bombarding the central area. The impact of decreased ambient temperature on the ion erosion of the central region of the accelerator grid is more intense. According to verification of a 2100h short time life test, the simulation results are coincident approximately, and the errors are mainly attributed to the parameters setting of fluid simulation method and the assumption of uniform ion sputtering on the wall of grid holes. © 2020, Editorial Department of Journal of Propulsion Technology. All right reserved.
引用
收藏
页码：121 / 131
页数：10
相关论文
共 16 条
  • [1] Sun M.-M., Zhang T.-P., Wang L., Et al., Thermal Stress and Thermal Deformation Analysis of Grids Assembly for 30cm Diameter Ion Thruster, Journal of Propulsion Technology, 37, 7, pp. 1393-1400, (2016)
  • [2] MacRae G., Zavesky R., Gooder, Structural and Thermal Response of 30cm Diamter Ion Thruster Optics
  • [3] Haag T., Mechanical Design of Carbon Ion Optics
  • [4] Chien K.R., Tighe W., An Overview of Electric Propulsion at L-3 Communications Electron Technologies Inc
  • [5] Hayashi M., Determination of Electron-Xenon Total Excitation Cross-Section, Journal of Physics D: Applied Physics, 16, 1, pp. 581-589, (1983)
  • [6] Sun M.-M., Zhang T.-P., Chen J.-J., Et al., Thermal Model of LIPS-200 Ring-Cusp Magnet Field Ion Thruster, Journal of Propulsion Technology, 36, 8, pp. 1274-1280, (2015)
  • [7] Anderson J., Katz I., Goebel D., Numerical Simulation of Two-Grid Ion Optics Using a 3D Cede
  • [8] Brophy J., Katz I., Polk J., Et al., Numerical Simulations of Ion Thruster Accelerator Grid Erosion
  • [9] Wirz R., Katz I., XIPS Ion Thruster Grid Erosion Predictions for Deep Space Missions
  • [10] Sun M.M., Jia Y.H., Huang Y.J., Et al., Study on the Influence of Three-Grid Assembly Thermal Deformation on Breakdown Times and an Ion Extraction Process, Plasma Science and Technology, 20, (2018)
12