真空室氢组分背压对霍尔推力器等离子体束聚焦特性的影响研究

StudyonInfluenceofHydrogenPartialPressure onHallThrusterPlasmaFocusingCharacteristics inGroundVacuumSystem

关键词:  霍尔推力器  地面真空系统  氢气分压  光谱  等离子体束聚焦

Key words:  Hall effect thruster  Ground vacuum system  Hydrogen pressure  Spectrum  Plasma focusing characteristics

摘要:

基于光谱方法和羽流探针诊断方法，研究分析了氢组分压力对霍尔推力器束流聚焦特性和振荡特性的影响。研究结果表明，随着罐内氢组分压力的提高，通道内氢的特征谱线强度增强，相比 pH =0Pa， pH =0.04Pa下最大 HI =652.6nm相对谱线强度增加了 8~9倍。氢组分向通道内的返流影响通道内的工质电离和离子加速过程，进而导致推力器束流特性变差，且伴随着低频振荡增大。当 pH =0.04Pa时，羽流发散半角为41.5°，相比 pH =0Pa条件下增加了24.5°。

Abstract:

The effects of the hydrogen component pressure on the beam focusing characteristic and oscillat.ing characteristic of the thrusters are studied and analyzed based on the methods of spectrum diagnosis and probediagnosis. The analysis indicates that with the increasing of the hydrogen partial pressure in the vacuum tank，the strength of the characteristic spectral line of hydrogen in the channel increased. The relative radiation intensity of HI =652.6nm with the condition of pH =0.04Pa has been raised 8~9 times as compared with the condition of pH= 0Pa. The backflow of the hydrogen component towards the inside of the channel affects the ionization and ion ac.celeration progresses，and thus causing the deviation of the beam focusing characteristic and increased low fre.quency oscillation. In the condition of pH =0.04Pa，the plume divergence half-angle is 41.5°，which increases by 24.5° compared with the condition of pH =0Pa.