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为了深入地揭示平板型脉冲等离子体推力器(PPT)工作机理,通过对PPT在放电过程中的欧姆加热能量分配分析,建立了基于能量守恒原理的改进烧蚀模型,并对磁流体动力学方程中的能量方程进行了修正。结合LES-6对PPT工作过程进行了一维磁流体动力学数值仿真,获得了PPT的速度分布、放电烧蚀质量和元冲量等参数的变化过程。仿真结果表明,改进模型能正确地反映脉冲等离子体推力器工作过程,仿真得到的出口速度、元冲量与实验值吻合较好,而放电烧蚀质量则相对误差较大;当电容容量变化时,元冲量随放电能量增大呈近似的线性增长关系,放电烧蚀质量随放电能量的增大单调增加且呈非线性关系。
In order to reveal the working mechanism of PPT, the improved ablation model based on the energy conservation principle was established by analyzing the Ohmic heating energy distribution of PPT during discharge. The magnetohydrodynamics equation In the energy equation has been amended. One-dimensional magnetohydrodynamic numerical simulation of PPT was carried out by combining with LES-6, and the change process of PPT velocity distribution, discharge ablation quality and elemental momentum were obtained. The simulation results show that the improved model can accurately reflect the working process of the pulsed plasma thruster. The simulated exit velocity and the element impulse agree well with the experimental values, but the relative error of the discharge ablation mass is relatively large. When the capacitance of the pulsed plasma thruster changes, The amount of impulse increases linearly with the increase of discharge energy. The quality of discharge ablation increases monotonously with the increase of discharge energy and shows a nonlinear relationship.