摘要
以脉冲等离子体推力器羽流为研究对象,建立三维物理模型,简化并离散电子动量方程,运用单元粒子-直接模拟蒙特卡罗混合法模拟非稳态羽流流动.假定脉冲周期内推进剂粒子按正弦规律进入流场,分析流场中电势、电子、离子和原子数密度分布随着时间变化情况,并通过与已有实验数据的对比验证仿真模型.研究表明:模型能在垂直和平行于推力器极板的两个平面内预测等离子体羽流流场参数.该研究方法、结果对更深入研究脉冲等离子体推力器(PPT)羽流具有参考价值.
By taking the plume of a pulsed plasma thruster （PPT） as research object,a three-dimensional physical model in a Cartesian coordinate system was developed,and the electron momentum equation was simplified and discreted to simulate the unsteady flow of plume employing particle-in-cell （PIC） and direct simulation Monte-Carlo （DSMC） hybrid method. Assuming that the propellant particles were injected to the flow field by a sinusoidal rule during a pulse period,the time-dependent profiles of potential,electron,ion and neutral number density were analyzed. Then the simulation model was verified by making comparisons between computational results and experimental data. The research indicates that the model could predict the parameters of the plasma plume in both parallel and perpendicular planes to electrodes. And the research method and findings can provide a reference for further study on PPT plume.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2010年第5期1145-1150,共6页
Journal of Aerospace Power
基金
国家自然科学基金(50306013)
关键词
脉冲等离子体推力器
羽流
三维
单元粒子
直接模拟蒙特卡罗
pulsed plasma thruster （PPT）
plume
three-dimensional
particle-in-cell （PIC）
direct simulation Monte-Carlo （DSMC）
