脉冲等离子体推力器内部流场的数值分析

应用所建立的广义拉格朗日乘子形式的磁流体力学模型对平行电极型脉冲等离子体推力器的内部流场进行了数值研究.对等离子体流动过程的分析表明,放电初期等离子体在很强的电磁力作用下高速喷出推力器,而到放电后期等离子体受到的气动力比电磁力大得多,等离子体的运动非常缓慢.电磁冲量占推力器元冲量的大部分,增强电磁加速作用可以进一步提高推力器的性能.

Numerical analysis of inner flow field of pulsed plasma thruster

A magnetohydrodynamics model in the form of the generalized Lagrange multiplier was adopted to simulate the inner flow field of a pulsed plasma thruster with rectangular geometry. Analyses on the flow process of plasma show that the plasma is accelerated to a high velocity to eject from the electrode channel under the strong electromagnetic acceleration in the beginning of the dis- charge. By contrast with this, the plasma moves downstream slowly in the later period of the dis- charge when aerodynamic force instead of electromagnetic force dominates the acceleration process. It indicates that the electromagnetic impulse accounts for the majority of the impulse bit of the thruster, and that the performance of this kind of thruster would benefit from the enhancement of elec- tromagnetic acceleration effects.