论文部分内容阅读
为了研究重粒子碰撞对霍尔推力器通道等离子体影响,采用PIC/MCC/DSMC混合法对放电通道工作过程进行数值仿真研究。建立放电通道二维数值仿真模型,模型中对重粒子碰撞进行重点考虑。估算了通道内各粒子碰撞下的平均自由程,并针对重粒子碰撞单一变量开展了2个仿真模型计算,并对结果进行了对比分析及验证。结果表明:重粒子碰撞对通道内离子数密度分布影响较大,主要表现为离子数密度分布在电离区更为均匀,离子数密度峰值下降6.9%;离子轴向速度影响较小,出口处离子轴向平均速度下降1.3%。与实验结果对比验证,重粒子碰撞因素使仿真结果与测试值之间误差由9.0%缩小到7.3%。
In order to study the influence of heavy particle collisions on Hall thruster channel plasma, the PIC / MCC / DSMC hybrid method was used to simulate the discharge channel work process. A two-dimensional numerical simulation model of discharge channel is established, and heavy particle collisions are considered in the model. The average free path of each particle collision in the channel was estimated. Two simulation models were calculated for a single variable of heavy particle collision. The results were compared and verified. The results show that heavy particle collisions have a great effect on the number density distribution of ions in the channel, mainly showing that the ion number density distribution is more uniform in the ionization region, the peak number of ion number density drops 6.9%, the ion axial velocity has less influence, The average axial speed dropped 1.3%. Compared with the experimental results, it is verified that the heavy particle collision factor reduces the error between the simulation result and the test value from 9.0% to 7.3%.