Non-equilibrium simulation of the spatial and temporal behavior of a magnetically rotating arc in argon
Non-equilibrium simulation of the spatial and temporal behavior of a magnetically rotating arc in argon
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DOI：
10.1088/0963-0252/20/3/035008
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发表时间：
2011-06-01
影响因子：
3.8
通讯作者：
Uhrlandt, D.
中科院分区：
文献类型：
--
作者：
Baeva, M.;Uhrlandt, D.
为了研究氩气中的磁旋转电弧，建立了常压下具有棒型阴极的直流等离子体炬的三维模型。利用磁流体动力学方程结合K-epsilon湍流模型描述了电弧与等离子体流动之间的相互作用。模拟研究是根据双温度描述（不同的电子和重粒子温度）进行的。在没有磁场的情况下，电子和重粒子的温度在弧核内几乎相同，而在弧壁附近、弧边缘和羽流中存在显著差异。在磁场存在的情况下，即使在电弧核心也会出现与LTE的偏差，并且那里的电子和重粒子温度相差约10%，因此强调需要双温度处理。高温等离子体区在轴向受约束，在径向膨胀。电弧芯内气体温度降低2000K。在中等强磁场中，磁驱动的等离子体旋转得到了解决，并观察到与轴对称的偏离。得到了等离子体和流动参数的计算结果并进行了讨论。
A three-dimensional model of a dc plasma torch with a rod-type cathode at atmospheric pressure has been developed in order to study a magnetically rotating arc in argon. The interplay between the arc and the plasma flow is described by means of magnetohydrodynamic equations in combination with a K-epsilon turbulence model. The simulation study is performed in terms of a two-temperature description (different electron and heavy particle temperatures). In the absence of magnetic field, the electron and heavy particle temperatures are nearly identical in the arc core, while near the walls, in the arc fringes and in the plume there are significant differences. With the magnetic field present, deviations from LTE appear even in the arc core and electron and heavy particle temperature differ there by about 10% thus emphasizing the need for a two-temperature treatment. The high temperature plasma region constrains in the axial and expands in the radial direction. The gas temperature gets lower by 2000K in the arc core. In a moderately strong magnetic field, the magnetically driven plasma rotation is resolved and deviations from the axial symmetry are observed. Results for plasma and flow parameters are obtained and discussed.