背景压强对电推进羽流场影响的数值模拟

翁惠焱; 蔡国飙; 郑鸿儒; 刘立辉; 张百一; 贺碧蛟

doi:10.13700/j.bh.1001-5965.2021.0039

背景压强对电推进羽流场影响的数值模拟

doi: 10.13700/j.bh.1001-5965.2021.0039

翁惠焱^{1, 2},
蔡国飙^{1, 2},
郑鸿儒³,
刘立辉^{1, 2},
张百一^{1, 2},
贺碧蛟^{1, 2, ,}

1.
北京航空航天大学宇航学院, 北京 100083
2.
北京航空航天大学航天器设计优化与动态模拟技术教育部重点实验室, 北京 100083
3.
长光卫星技术股份有限公司, 长春 130000

基金项目:

国家自然科学基金 51977003

详细信息

通讯作者:
贺碧蛟, E-mail: hbj@buaa.edu.cn

中图分类号: V439
计量
- 文章访问数: 432
- HTML全文浏览量: 107
- PDF下载量: 47
- 被引次数: 0
出版历程
- 收稿日期: 2021-01-21
- 录用日期: 2021-04-04
- 网络出版日期: 2021-04-09
- 整期出版日期: 2022-10-20

Numerical simulation of effect of background pressure on electric propulsion plume field

WENG Huiyan^{1, 2},
CAI Guobiao^{1, 2},
ZHENG Hongru³,
LIU Lihui^{1, 2},
ZHANG Baiyi^{1, 2},
HE Bijiao^{1, 2
, ,}

1.
School of Astronautics, Beihang University, Beijing 100083, China
2.
Key Laboratory of Spacecraft Design Optimization & Dynamic Simulation Technologies, Ministry of Education, Beihang University, Beijing 100083, China
3.
Chang Guang Satellite Technology Co., Ltd., Changchun 130000, China

Funds:

National Natural Science Foundation of China 51977003

More Information

Corresponding author: HE Bijiao, E-mail: hbj@buaa.edu.cn

摘要

摘要:
真空舱内背景压强是电推力器地面试验过程中影响工作性能评估和羽流场参数诊断的重要参数。针对LIPS-200型离子推力器羽流场参数的数值仿真中采用的背景压强建立方法进行了仿真分析。仿真中采用混合粒子网格(PIC)方法和直接模拟蒙特卡罗(DSMC)方法处理羽流场中等离子体运动和粒子间碰撞，分别采用虚拟粒子和计算粒子建立压强的方式，对电推进羽流场进行了数值模拟，并与绝对真空环境进行对比分析。结果表明：背景压强的存在导致中性粒子和电荷交换离子数密度较绝对真空环境高1个量级以上。虚拟粒子可大幅提高计算效率，获得的流场中电荷交换离子分布与计算粒子结果相近，但中性粒子分布相差较大，虚拟粒子无法表征壁面及真空泵的影响。
- 电推进 /
- 羽流 /
- 背景压力 /
- 粒子网络-直接模拟蒙特卡罗(PIC-DSMC)方法 /
- 数值模拟
Abstract:
The background pressure in vacuum chamber is an important parameter that affects the performance evaluation and plume field parameter diagnosis of electric thruster during ground tests. In this paper, a simulation analysis was made on the background pressure establishment method used in the numerical simulation of the plume field parameters of LIPS-200 ion thruster. The hybrid particle in cell (PIC) method and the direct simulation Monte Carlo (DSMC) method were used to deal with plasma motion and particle collisions in plume field. The electric propulsion plume was numerically simulated by using virtual particles and computed particles respectively, and compared with the vacuum environment. The results show that the number densities of neutral particles and charge-exchange ions are more than one order of magnitude higher than those in the vacuum environment due to the existence of background pressure. The virtual particles can greatly improve the computational efficiency, and the charge-exchange ion distribution in the plume field obtained is similar to that of the computed particle. However, the neutral particle distribution is quite different, so the influence of the wall and vacuum pump cannot be characterized by virtual particles.
- electric propulsion /
- plume /
- background pressure /
- particle in cell-direct simulation Monte Carlo (PIC-DSMC) method /
- numerical simulation

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图 1 网格中电荷分配示意图

Figure 1. Schematic diagram of charge distribution in the grid

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图 2 蛙跳算法示意图

Figure 2. Schematic diagram of leapfrog algorithm

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图 3 背景压强算例计算域示意图

Figure 3. Simulation domain for background pressure cases

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图 4 计算粒子建立的中性气体分布

Figure 4. Neutral gas distribution created by computed particles

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图 5 计算粒子建立的背景压强中性气体分布

Figure 5. Neutral gas distribution of background pressure created by computed particles

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图 6 虚拟粒子建立的背景压强中性气体分布

Figure 6. Neutral gas distribution of background pressure created by virtual particles

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图 7 绝对真空环境下的中性气体分布

Figure 7. Neutral gas distribution in absolute vacuum case

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图 8 推力器出口轴线上不同模拟情况下中性粒子数密度对比

Figure 8. Comparison of neutral particle number density at thruster outlet axis in different simulation cases

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图 9 推力器出口0.5 m径向中性粒子数密度对比

Figure 9. Comparison of radial neutral particle number density at thruster outlet of 0.5 m

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图 10 推力器出口轴线上不同模拟情况下电荷交换离子数密度对比

Figure 10. Comparison of CEX ion number density at thruster outlet axis in different simulation cases

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图 11 推力器出口0.5 m径向电荷交换离子数密度对比

Figure 11. Comparison of radial CEX ion number density at thruster outlet of 0.5 m

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图 12 计算粒子算例中的电势分布

Figure 12. Potential distribution in computed particle case

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图 13 绝对真空环境下的电势分布

Figure 13. Potential distribution in absolute vacuum case

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图 14 计算粒子算例中的电荷交换离子分布

Figure 14. Distribution of CEX ions in computed particle case

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图 15 绝对真空环境下的电荷交换离子分布

Figure 15. Distribution of CEX ions in absolute vacuum case

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表 1 LIPS-200型离子推力器工作参数^[21]

Table 1. Parameters of LIPS-200 ion thruster^[21]

工作参数	数值
屏栅电压/V	1 000
束电流/A	0.8
阴极氙气流率/(mg·s^-1)	0.14
放电室氙气流率/(mg·s^-1)	1.1
中和器阴极流率/(mg·s^-1)	0.14

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表 2 LIPS-200型离子推力器仿真基本参数^[22]

Table 2. Basic simulation parameters of LIPS-200 ion thruster^[22]

粒子种类	流率/s^-1	温度/K	速度/(m·s^-1)
Xe	5.69×10¹⁷	300	325
Xe⁺	4.61×10¹⁸	46 400	38 313
Xe²⁺	5.12×10¹⁷	46 400	54 183

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表 3 背景压强处理方式对比的算例安排

Table 3. Case arrangement for comparison of background pressure simulation methods

算例	初始压强/mPa	边界处理
计算粒子	0	反射
虚拟粒子	0.25	自由边界
绝对真空环境	0	自由边界

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