In this study we performed a numerical investigation on different discharge modes of the magnetically rotating arc at atmospheric pressure. By using a three-dimensional simulation model taking into account of the arc-cathode interaction, it is able to predict the three different kinds of cathode arc attachments. Those modes of arc discharge have been observed in previous experiments. Arc attachments in constricted (i.e. spot) and diffuse mode are almost axisymmetric, however the edge mode offers a non-axisymmetric result. The corresponding arc plasma properties operating in different modes differ greatly from each other. Driven by the non-axisymmetric Lorentz force, a ‘twisted’ arc column emerges between the electrodes in edge mode, while the cathode arc attachment focuses to a corner of the edge. The heavy particle and electron particle temperatures are much lower in diffuse mode than the other two modes. Those plasma features of multi-modes should be considered in the applicat...

中文翻译：

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外磁场作用下氩弧不同放电方式的稳态模拟

在这项研究中，我们对大气压下的磁旋转电弧的不同放电模式进行了数值研究。通过使用考虑了电弧-阴极相互作用的三维仿真模型，可以预测三种不同类型的阴极电弧附件。在先前的实验中已经观察到那些电弧放电模式。收缩（即点）和扩散模式下的电弧附件几乎是轴对称的，但是边缘模式提供了非轴对称的结果。在不同模式下运行的相应电弧等离子体特性彼此差异很大。在非轴对称洛伦兹力的驱动下，“扭曲的”电弧柱以边缘模式出现在电极之间，而阴极电弧附件则聚焦在边缘的一角。重粒子和电子粒子的温度在扩散模式下要比其他两种模式低得多。应当在应用中考虑多模式的那些等离子体特征。