脉冲等离子体推力器放电电离二维PIC建模与仿真

摘要： 针对脉冲等离子体推力器（PPT）的放电过程，利用粒子网格 蒙特卡洛（PIC MCC）方法建立仿真计算模型.以LES 6 PPT为例，加入电离碰撞进行电离仿真.通过粒子运动碰撞与电磁场耦合仿真计算得到电流与电路总电阻的变化规律，揭示了PPT放电过程中等离子体密度分布情况.通过对比不加入粒子预分布与加入粒子预分布的两种条件下的计算结果，得到了加入粒子预分布使带电粒子密度计算结果更接近实验结果的结论.根据PPT的工作过程，在放电之前推力器内存在等离子体，所以在仿真研究中应进行粒子的预分布.文中的研究方法对PPT的粒子方法模拟具有一定的参考意义.

Two Dimensional Particle in Cell Modeling and Numerical Simulation on the Discharge and Ionization of Pulsed Plasma Thruster

Abstract：A particle in cell method with Monte Carlo collision (PIC MCC) model is established for the discharge process in pulsed plasma thruster (PPT). The ionization process in LES 6 PPT is simulated, considering the ionization collisions. According to the coupling computation of particle movement, collisions and electromagnetic field, the curves of current and resistance are acquired, and the distributions of plasma during the discharge of PPT are presented. Two initial conditions with and without particles pre distribution are applied respectively to the numerical computation, implying that the results in the case with the pre distribution are closer to the experimental results. The results in the other case tend to be in accordance with the results in the ignition process. The methods and model explored in this work provide a certain reference for PIC simulations in PPT.