Spatial and Temporal Distribution of Ion Engine Accelerator Grid Erosion
Spatial and Temporal Distribution of Ion Engine Accelerator Grid Erosion
复制标题
离子发动机加速器栅极侵蚀的时空分布
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
J. Polk
中科院分区：
文献类型：
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作者：
J. Polk
在双网栅离子光学系统中，由于电荷交换离子侵蚀而引起的加速器栅极的结构失效被认为是离子发动机的主要失效模式之一。对惰性气体离子推力器长时间试验中使用的三种加速器栅极进行了详细的检查，以表征径向质量损失分布、侵蚀模式中质量损失的局部分布以及它如何随着模式的演变而变化。结果表明，与空间中预期的情况相比，径向剖面显著加宽，网格之间存在显著变化。质量损失的局部分布以及它如何随侵蚀模式中的总质量损失的增加而变化，也被发现在三个网格之间有很大的不同。结果表明，在推广试验结果或模拟网格故障以计算发动机使用寿命时，不能忽略侵蚀几何的细节。
Structural failure of the accelerator grid in two-grid ion optics due to charge exchange ion erosion is considered one of the dominant failure modes for ion engines. A detailed examination of three accelerator grids used in long duration tests of inert gas ion thrusters was undertaken to characterize the radial mass loss distribution, the local distribution of mass loss in the erosion pattern and how it varies as the pattern evolves. The results show significant broadening of the radial profile compared to what is expected in space with significant variations from grid to grid. The local distribution of mass loss and how it varies with increasing total mass loss in the erosion pattern was also found to differ considerably among the three grids. The results indicate that the details of the erosion geometry cannot be ignored when generalizing test results or modeling grid failure to calculate useful engine service life.