| 引用本文: | 孙明明,耿海,杨俊泰,等.30cm离子推力器栅极组件寿命预估及试验验证.[J].国防科技大学学报,2023,45(6):232-240.[点击复制] |
| SUN Mingming,GENG Hai,YANG Juntai,et al.Life estimation and experimental verification for the grids assembly of 30 cm diameter ion thruster[J].Journal of National University of Defense Technology,2023,45(6):232-240[点击复制] |
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| 30cm离子推力器栅极组件寿命预估及试验验证 |
| 孙明明，耿海，杨俊泰，岳士超 |
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(兰州空间技术物理研究所 真空技术与物理重点实验室)
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| 摘要: |
| 为了预估30 cm离子推力器现有三栅极组件的整体寿命，采用有限元分析和PIC-MCC方法分别对栅极组件的热态平衡间距以及栅极不同区域的刻蚀速率进行了模拟和计算。结果显示，推力器达到热平衡状态时，减速栅整体变形呈现中心局部凹陷特征，加速栅整体变形呈均匀突起；在直径0~70 mm内的中心区域，两栅间距平均缩小0.057 mm；在直径70~140 mm内的环形区域，两栅间距平均增大0.129 mm；减速栅边缘区域小孔在1500 h内的刻蚀速率达到6.25×10-14 kg/s，而5700 h的栅孔刻蚀速率相比1500 h的降幅达到了15.4%；5700 h的加速栅中心和边缘以及减速栅中心区域小孔的刻蚀速率相比1500 h的降幅分别达到了8.0%、4.1%和3.6%。5700 h的寿命试验结果显示，减速栅中心孔、加速栅中心和边缘孔的刻蚀基本呈线性，仿真与试验结果的比对误差均在10%以内。 |
| 关键词: 离子推力器 栅极组件 寿命预估 试验验证 |
| DOI：10.11887/j.cn.202306024 |
| 投稿日期：2021-09-22 |
| 基金项目:国家自然科学基金资助项目(61901202，11702123) |
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| Life estimation and experimental verification for the grids assembly of 30 cm diameter ion thruster |
| SUN Mingming, GENG Hai, YANG Juntai, YUE Shichao |
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(Science and Technology on Vacuum Technology and Physics Laboratory， Lanzhou Institute of Physics， Lanzhou 730000 ， China)
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| Abstract: |
| In order to estimate the overall life of the existing three gate module of 30 cm diameter ion thruster, the grid gap under thermal equilibrium state and the erosion velocity of different regions of the grids were simulated and calculated by FEM (finite element method) and PIC-MCC (particle-in-cell-Monte Carlo collision) method respectively. The results show that when the thruster reaches the thermal equilibrium, the overall deformation of the decelerator grid presents central area depression characteristics, and the overall deformation of the accelerator grid presents a uniform protruding. In the center area of the grids with the diameter of 0~70 mm, the mean gap between the two grids decreases by 0.057 mm. Meanwhile, in the annular region with the diameter of 70~140 mm, the mean gap between the two grids increases by 0.129 mm. The erosion velocity of the apertures at the edge of the decelerator grid reaches 6.25×10-14 kg/s within 1500 h, and which of the aperture at 5700 h decreases 15.4% compared with 1500 h. The erosion velocity of the apertures at the center and edge of the accelerator grid, and the apertures at the center of the decelerator grid decreases 8.0%，4.1% and 3.6%, respectively. The results of 5700 h life test show that the erosion of the apertures at the center of the decelerator grid, and the apertures at the center and edge of the accelerator grid are basically linear, and the comparison error between the simulation and test is within 10%. |
| Keywords: ion thruster grids assembly life estimation experimental verification |
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