An Evaluation of Sources of Erosion in Hall Thrusters
An Evaluation of Sources of Erosion in Hall Thrusters
复制标题
霍尔推进器侵蚀源的评估
DOI：
10.2514/6.2005-3530
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
I. Boyd
中科院分区：
文献类型：
--
作者：
J. Yim;M. Keidar;I. Boyd
随着涉及霍尔推进器的任务变得更加扩展和进一步延伸，出现了推进器开始需要具有10000小时及以上的寿命的寿命问题。静止等离子体推力器（SPT）的主要限制因素和失效模式是加速通道壁的侵蚀。离子撞击表面引起的溅射过程会腐蚀壁。这项工作调查两个来源的离子通量的墙壁造成侵蚀。在以前的研究中，散射碰撞进行了检查，以观察其在偏转离子的墙壁的贡献。在这里，我们使用一个更复杂的流体动力学模型的等离子体，以确定离子通量的墙壁所造成的等离子体动力学，以及包括近壁相互作用。这两种模型提供的结果与实验数据吻合良好。然而，散射碰撞模型提出了一些有争议的假设。水动力学模型表明，近壁面效应在冲蚀过程中起着重要作用。
As missions involving Hall thrusters become more extended and further reaching, lifetime issues arise in which the thrusters begin to need to have lifespans of 10000 hours and upwards. The main limiting factor and failure mode of stationary plasma thrusters (SPT) is the erosion of the acceleration channel walls. The walls erode from a sputtering process caused by ions impacting the surfaces. This work investigates two sources of the ion flux to the walls causing erosion. In a previous study, scattering collisions were examined to observe their contribution in deflecting ions to the walls. Here we use a more sophisticated hydrodynamic model of the plasma to determine the ion flux to the walls as caused by the plasma dynamics as well as including near-wall interactions. Both models provide results that match well with experimental data. However, the scattering collisions model makes a number of debatable assumptions. The hydrodynamic model shows that the near-wall eects have a significant role in the erosion process.