【摘要】 以国内研制的稳态等离子体推力器羽流为研究对象,建立了基于粒子单元法和直接蒙特卡罗模拟法的数值仿真模型,简化了电子动量方程,运用Boltzmann关系式求解了等离子体电势,研究了羽流电子数密度、离子电流密度及流场温度分布。通过与实验数据和已有数值结果对比,以验证模型和编制的程序。研究表明,羽流出口下游0.3~1.0 m处的羽流中心电子数密度约为2.5×1016~5×1015m-3,电流密度约为65~1 A/m2。文中工作对分析等离子体羽流污染具有参考意义。更多还原

【Abstract】 Taking plume of the stationary plasma thruster manufactured by China as research object,a numerical simulation model was derived based on particle-in-cell and direct simulation Monte-Carlo hybrid method.The electron momentum equation was simplified.Boltzmann relational expression was used for solving plasma potential.The electron number density of the plume,ion current density,and temperature distribution of flow field were investigated.Then the model and the program were verified by comparison of calculation results,experimental data and existing numerical results.The investigation results show that the electron number density of plume center at a distance of exit downstream 0.3~1.0 m is about 2.5×1016～5×1015 m-3,and current density is about 65～1 A/m2.The above conclusion can provide the reference for analyzing contamination of plasma plume.更多还原