霍尔推力器不同壁面侵蚀对低频振荡特性影响研究

基于霍尔推力器一维准中性流体模型,对放电壁面侵蚀对低频振荡特性的影响进行了数值模拟研究。通过改变霍尔推力器放电通道的横截面积,研究了霍尔推力器寿命期内通道受离子溅射后,放电电流振荡特性变化。研究结果显示,横截面积从25cm2增大到37cm2时,放电电流振荡幅值增加,振荡频率基本不变;继续增加横截面积,放电电流振荡幅值减小,振荡频率增加。理论分析表明:通道侵蚀面积增大,导致离子碰撞频率变化,进而引起振荡特性变化。

Effects of Different Wall Erosion on Low Frequency Oscillation Characteristics of Hall Thruster

A Hall thruster is a widely used space platform power device, and its discharge current includes low-frequency oscillation with large values. Based on a one-dimensional quasi-neutral fluid model, this paper studies the oscillation characteristics of discharge current in a Hall thruster after ion sputtering in the channel during its lifetime by changing the cross-sectional area of the discharge channel. The results show that when the cross-sectional area increases from 0.0025 m2 to 0.0037 m2, the oscillation amplitude of discharge current increases and the oscillation frequency almost remains unchanged. If the cross-sectional area continues to increase, the oscillation amplitude of discharge current decreases and the oscillation frequency increases. Theoretical analysis shows that the channel erosion will lead to the change of ion collision frequency, which will further lead to the change of oscillation characteristics.