霍尔推力器预电离对低频振荡及壁面腐蚀影响的研究

ATON型霍尔推力器提出后，基于缓冲区的预电离现象的系列研究随之展开。但是迄今为止，预电离率的选择仍然未有定论。文章基于SPT-100型霍尔推力器的真实工作尺寸，建立了二维轴对称全粒子网格质点法（PIC）模型对推力器放电室内的放电过程进行模拟，并通过施加不同的缓冲区预电离率着重研究了预电离率与放电通道低频振荡和推力器壁面腐蚀之间的关系。研究结果显示，缓冲区预电离率的提高可以有效抑制放电通道内的低频振荡，使推力器工作性能提高。但与此同时，由于撞击通道壁面的离子能量增加导致通道壁面腐蚀加剧。

Effect of pre-ionization on low frequency oscillation and wall corrosion in Hall thrusters

With the proposed of ATON-Hall thrusters,a series of studies were carried out based on pre-ionization phenomenon in buffer. However, the selection of pre-ionization rate is still inconclusive.Therefore, two-dimensional axisymmetric full particle PIC (Fully-kinetic Particle-In-Cell) simulations were carried out based on the real size of SPT-100 Hall thruster to simulate the discharge process in the discharge chamber. The relations between and among pre Ionization rate, low frequency oscillation in the discharge channel and wall corrosion of Hall thruster were mainly studied. The simulation results show that increasing the pre-ionization rate in the buffer chamber can effectively suppress low frequency oscillation, and improve the performance of the propeller. But at the same time, the increase of the energy of ion impacting on the channel surface aggrevates the corrosion of the surface, and shorten the propeller′s shorten service life.