A New Method for Analyzing Near-Field Faraday Probe Data in Hall Thrusters
A New Method for Analyzing Near-Field Faraday Probe Data in Hall Thrusters
复制标题
分析霍尔推进器近场法拉第探针数据的新方法
DOI：
10.2514/6.2013-4118
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
H. Kamhawi
中科院分区：
文献类型：
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作者：
Wensheng Huang;Rohit Shastry;D. Herman;G. Soulas;H. Kamhawi
本文提出了一种分析霍尔推力器近场法拉第探测数据的新方法。由远场法拉第探测器分析产生的传统方法依赖于不适用于近场法拉第探测器数据的假设。特别是，对原点和积分限的任意选择使得对结果的解释变得困难。这种新方法被称为迭代寻径，它利用近场羽流随距离的演变为确定起源点的位置提供反馈。尽管该方法仍然容易受到积分极限选择的影响，但它提供了一种系统的方法来确定计算发散角的原点。迭代寻径方法应用于NASA-300M和NASA-457Mv2霍尔推进器的近场法拉第探测器数据。由于这两个推进器使用中央安装的阴极，在应用迭代寻路之前，与阴极羽流相关的电流密度被去除。介绍了一种去除阴极羽流的方法。分析结果与远场探针分析结果进行了比较。本文最后对新方法的有效性进行了检验，并讨论了结果的意义。
Abstract This paper presents a new method for analyzing near-field Faraday probe data obtained from Hall thrusters. Traditional methods spawned from far-field Faraday probe analysis rely on assumptions that are not applicable to near-field Faraday probe data. In particular, arbitrary choices for the point of origin and limits of integration have made interpretation of the results difficult. The new method, called iterative pathfinding, uses the evolution of the near-field plume with distance to provide feedback for determining the location of the point of origin. Although still susceptible to the choice of integration limits, this method presents a systematic approach to determining the origin point for calculating the divergence angle. The iterative pathfinding method is applied to near-field Faraday probe data taken in a previous study from the NASA-300M and NASA-457Mv2 Hall thrusters. Since these two thrusters use centrally mounted cathodes, the current density associated with the cathode plume is removed before applying iterative pathfinding. A procedure is presented for removing the cathode plume. The results of the analysis are compared to far-field probe analysis results. This paper ends with checks on the validity of the new method and discussions on the implications of the results.