物理学报Issue(9)：1-8,8.DOI:10.7498/aps.64.094104
栅极热变形对离子推力器工作过程影响分析∗
Analysis on the effects of optics thermal deformation on the ion thruster op eration
摘要
Abstract
Optics thermal deformation is an important factor that impacts the performance and lifetime of ion thrusters. Al-though some theoretical research concerned with this problem was reported, its mechanism has not been fully understood. In this study, numerical investigations are performed to explain the effect of thermal deformation on the performance and lifetime of ion thrusters. The transient behavior of charged particles is calculated using a particle-in-cell simulation, while the momentum transfer collision and the charge exchange collision are calculated by means of the Monte Carlo method. Electron backstreaming restriction, perveance restriction, ions through rate, and divergence angle losses are compared and analyzed for optics deformed and undeformed. And the influence of these factors on thruster’s performance and lifetime is discussed. Results show that the ion through rate of the screen grid increases when optics begin deformed, and the thrust is slightly higher than the theoretical values predicted;the perveance threshold of the accelerator grid increases with optics haveing thermal deformation, while the crossover limit threshold is little changed, namely the thruster can be operated in conditions of a larger beam current;the electron backstreaming restriction threshold is significantly lower under a high beam current condition with optics deformed, which means that a lower accelerating gate bias is necessary to ensure thruster work. For the less obvious change of acceleratng grid current when the beam is focused, there is no more erosion and change of lifetime. Results provide a reference for the optimization design of optics and evaluation of thruster performance and lifetime.关键词
离子推力器/栅极系统/热变形/等离子体模拟Key words
ion thruster/optic/thermal deformation/plasma simulation引用本文复制引用
陈茂林,夏广庆,徐宗琦,毛根旺..栅极热变形对离子推力器工作过程影响分析∗[J].物理学报,2015,(9):1-8,8.基金项目
国家自然科学基金(批准号:51276147,11105023,11275034)、中央高校基本科研业务费专项资金(批准号:3102014KYJD005,3132014328)和西北工业大学基础研究基金(批准号：NPU-FFR-JC20120201)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant Nos.51276147,11105023,11275034), the Fundamental Research Funds for the Central Universities, China (Grant Nos.3102014KYJD005,3132014328), and the NPU Foundation for Fundamental Research, China (Grant No. NPU-FFR-JC20120201) （批准号:51276147,11105023,11275034）
