| 摘要: |
| 针对基于最优导流工况设计的双阶四栅栅极系统在多工况下的引出性能，采用浸入式有限元和粒子云算法（IFE-PIC）对其聚焦和引出过程进行了研究。研究结果表明，相较于相同聚焦电压下的传统栅极系统，基于最优导流工况设计的双阶四栅栅极系统由过聚焦进入正常聚焦的拐点右移，栅极系统的引出性能变差。因此建议双阶栅极离子推力器在设计时使用小口径放电腔体，以提高栅极上游等离子体密度，从而使得双阶四栅栅极系统处于正常聚焦状态，并注意重点设计双阶加速栅极参数，如增大其孔径，以规避或减少束流离子的直接冲击。 |
| 关键词: 电推进 离子推力器 等离子体 引出性能 粒子云算法 |
| DOI：10.13675/j.cnki.tjjs.200836 |
| 分类号:V439.4 |
| 基金项目:国家重点研发计划（2020YFC2201104；2020YFC2201103）；国家自然科学基金（11675040；11702319）；中央高校基本科研业务费专项资金（DUT19LAB46；DUT20LAB203）；辽宁省重点研发计划（2020JH2/10500003）；天琴计划教育部重点实验室（筹）开放基金（TQRF-2020-2.5）。 |
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| Extraction Performance of Dual-Stage Grid of Ion Thruster |
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LU Chang1,2, CAO Yong3, XIA Guang-qing1,2
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1.State Key Laboratory of Structural Analysis for Industrial Equipment，School of Aeronautics and Astronautics， Dalian University of Technology，Dalian 116024，China;2.Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province，School of Aeronautics and Astronautics，Dalian University of Technology，Dalian 116024，China;3.School of Mechanical Engineering and Automation，Harbin Institute of Technology（Shenzhen）， Shenzhen 518055，China
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| Abstract: |
| Aiming at the extraction performance of the dual-stage 4-grid under multiple operating conditions， the focusing and extraction process based on the immersed finite element and particle-in-cell method （IFE-PIC） are studied. The results show that， compared with the conventional grid under the same focusing voltage， the inflection point of over-focus to normal-focus of the dual-stage 4-grid based on the optimal diversion condition moves right， which means its extraction performance becomes worse. Therefore， it is suggested that a small diameter discharge chamber should be used in the design of the dual-stage grid ion thruster to improve the plasma density upstream of the grid， so as to make the dual-stage 4-grid system in normal focusing state. Furthermore， more attention should be paid to the design of dual-stage accelerator grid， such as increasing its aperture diameter， so as to avoid or reduce the direct impact of beam ions. |
| Key words: Electric propulsion Ion thruster Plasma Extraction performance Particle-in-cell method |
