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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.
Taking the pulsed plasma thruster plume as the research object, a three-dimensional physical model was established to simplify and discretize the electron momentum equation and simulate the unsteady plume flow by using the unit particle-direct simulation Monte Carlo method. It is assumed that the propellant particles According to the law of sinusoidal flow into the flow field, the distribution of potential, electron, ion and atom density in the flow field is analyzed with time, and the simulation model is verified by comparison with the existing experimental data.The results show that the model can be vertically and parallel Predict plasma plume flow field parameters in two planes of thrusters plate.The research method and the results are of reference value for further study of pulsed plasma thruster (PPT) plume.