磁屏尺寸对霍尔推力器性能影响的仿真研究

Simulation study on the influence of magnetic screen size on Hall thruster performance

磁屏作为霍尔推力器磁路系统的重要组成部分,其尺寸对磁感应强度分布具有重要影响。为探究其中的影响规律,以一台低功率霍尔推力器为研究对象,首先采用Maxwell有限元方法软件对磁屏在不同的轴向和径向尺寸下形成的磁场进行仿真,结果表明一组尺寸使推力器磁场位形达到最优。然后以该尺寸作为设计标准,采用PIC方法对霍尔推力器在阳极电压及气体流量分别为200 V及0.8 mg/s条件下放电通道内等离子参数分布进行仿真。最后根据离子速度和数密度等参数,计算得到推力器的推力、阳极比冲和阳极效率分别约为6.9 mN、880 s及41.89%。该仿真为霍尔推力器的磁场设计提供理论依据,为未来的实验研究提供数值参考。

Magnetic screen is an important part of magnetic circuit system,and its sizes have an important influence on magnetic flux density distribution.In order to explore the influence law,a low-power Hall thruster was chosen as the research object.First,the finite element software Maxwell was used to simulate the magnetic flux density distributions under different axial and radial sizes of the magnetic screens.The results showed that there was a set of dimensions that could create the best magnetic field configuration for the thruster.Then,PIC method was employed to simulate the distributions of plasma parameters at 200 V anode voltage and 0.8 mg/s gas flow rate in the discharge channel with the dimensions as the design standard.Finally,according to the ion velocity and ion number density distributions,the calculated thrust,anode specific impulse,and anode efficiency were respectively 6.9 mN,880 s,and 41.89%.This simulation study provides a theoretical basis for magnetic field design of Hall thruster and a numerical reference for future experimental research.