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运用磁流体动力学的方法,对脉冲等离子体推力器推力室工作过程开展三维双温MHD数值仿真,并开展对推力室的工作机理的分析研究。通过该模型计算得到的推进剂烧蚀质量和元冲量与实验结果相符,同时针对不同初始电压、电容以及两种特征波形的情况进行评估,为推力器的放电波形设计提供指导依据。结果显示在推力器波形设计的初期,是采用电流高变化率低能量水平,还是采用电流低变化率高能量水平,需要结合实际,进行优化评估。
By using the method of magnetohydrodynamics, the numerical simulation of three-dimensional dual-temperature MHD is carried out in the working process of thrust chamber of pulsed plasma thruster, and the working mechanism of thrust chamber is analyzed. The ablation mass and the element impulse calculated by the model are in good agreement with the experimental results, and the different initial voltages, capacitances and the two characteristic waveforms are evaluated at the same time to provide guidance for the design of the discharge waveform of the thruster. The results show that in the early stage of the thruster waveform design, whether to adopt the high current with low change rate or the low current with high change rate and high energy level need to be optimized according to the actual conditions.