包括近场羽流区的SPT和HEMP推力器的自洽动力学模拟
Self consistent kinetic simulations of SPT and HEMP thrusters including the near-field plume region
摘要：
采用PIC（Particle-in-Cell）方法研究了两种不同的离子推力器方案--静止等离子体推力器（SPT）和高效多级等离子体推力器（HEMP-T），特别是不同磁场配置下放电室中等离子体的特性。特别注意等离子体粒子通量的模拟上的推力器通道表面。在这两种情况下，PIC都证明了自己是一个强大的工具，为不同推进器概念的基本物理提供了重要的见解。模拟表明，新的HEMP推力器概念允许高的热效率，由于最小的能量耗散和高加速效率。在HEMP推进器中，等离子体与壁的接触仅限于磁场尖点的非常小的区域，这导致与SPT相比，到推进器通道表面的离子能量通量小得多。采用二进制碰撞程序SDTrimSP计算了SPT和HEMP推力器介质放电通道壁的烧蚀产额。对于SPT，观察到每小时1 mm溅射材料水平上的侵蚀速率。对于HEMP，推力器模拟表明，在介质放电通道内没有腐蚀。
英文摘要：
The Particle-in-Cell (PIC) method was used to study two different ion thruster concepts - Stationary Plasma Thrusters (SPT) and High Efficiency Multistage Plasma Thrusters (HEMP-T), in particular the plasma properties in the discharge chamber due to the different magnetic field configurations. Special attention was paid to the simulation of plasma particle fluxes on the thrusters channel surfaces. In both cases, PIC proved itself as a powerful tool, delivering important insight into the basic physics of the different thruster concepts. The simulations demonstrated that the new HEMP thruster concept allows for a high thermal efficiency due to both minimal energy dissipation and high acceleration efficiency. In the HEMP thruster the plasma contact to the wall is limited only to very small areas of the magnetic field cusps, which results in much smaller ion energy flux to the thruster channel surface as compared to SPT. The erosion yields for dielectric discharge channel walls of SPT and HEMP thrusters were calculated with the binary collision code SDTrimSP. For SPT, an erosion rate on the level of 1 mm of sputtered material per hour was observed. For HEMP, thruster simulations have shown that there is no erosion inside the dielectric discharge channel.
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