Novel non-equilibrium modelling of a DC electric arc in argon
Novel non-equilibrium modelling of a DC electric arc in argon
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DOI：
10.1088/0022-3727/49/24/245205
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发表时间：
2016-06-22
影响因子：
3.4
通讯作者：
Uhrlandt, D.
中科院分区：
文献类型：
--
作者：
Baeva, M.;Benilov, M. S.;Uhrlandt, D.
开发了一种新颖的非平衡模型来描述直流电弧中传热传质以及电场和磁场的相互作用。应用粒子通量的完整扩散处理、欧姆定律的广义形式以及电弧等离子体与电极附近的空间电荷鞘的数值匹配来详细分析等离子体参数以及在大气压氩气中产生的直流电弧的等离子体柱和近电极区域中发生的现象，电流水平为 20 A 至 200 A。结果包括 电场和电势、电流密度、电极加热以及热和化学非平衡的影响进行了介绍和讨论。获得的电流-电压特性与已知的实验数据相当一致。它表明电弧电流的最小值约为 80 A。对于所有电流水平，都会观察到阳极前面的磁场反转，并伴有 (0.7-2.6) V 的电压降。当电弧电流低于 80 A 时，在阴极附近观察到另一个磁场反转。
A novel non-equilibrium model has been developed to describe the interplay of heat and mass transfer and electric and magnetic fields in a DC electric arc. A complete diffusion treatment of particle fluxes, a generalized form of Ohm's law, and numerical matching of the arc plasma with the space-charge sheaths adjacent to the electrodes are applied to analyze in detail the plasma parameters and the phenomena occurring in the plasma column and the near-electrode regions of a DC arc generated in atmospheric pressure argon for current levels from 20 A up to 200 A. Results comprising electric field and potential, current density, heating of the electrodes, and effects of thermal and chemical non-equilibrium are presented and discussed. The current-voltage characteristic obtained is in fair agreement with known experimental data. It indicates a minimum for arc current of about 80 A. For all current levels, a field reversal in front of the anode accompanied by a voltage drop of (0.7-2.6) V is observed. Another field reversal is observed near the cathode for arc currents below 80 A.