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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Non-equilibrium modelling of free-burning argon arc in different anode sheath regimes
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Non-equilibrium modelling of free-burning argon arc in different anode sheath regimes

机译：不同阳极鞘制度中的自由灼烧氩弧弧的非平衡建模

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摘要

In this paper, an anode sheath model coupled with two-dimension arc column model is performed to study the physical process in the near-anode region. In the anode sheath model, two different physical mechanisms of ion and electron dynamics, for positive and negative anode sheath voltages, are considered. The effect of the arc column on the anode is also considered. The arc column model accounts for the thermal non-equilibrium and ionization non-equilibrium. The diffusion equations and generalized Ohm's law are used to analyze the effect of diffusion of plasma species near the anode region. The simulation results from this model are presented for an atmospheric free-burning argon arc with arc currents of 50 A and 150 A. The simulation shows that: (1) both positive and negative anode sheath voltages are obtained for I = 50 and 150 A. The distributions of electric potential in front of the anode surface predicted by the model are in good agreement with the experimental data. (2) In the negative anode sheath regime, the diffusion current density exceeds the total current density, which makes the electric field reverse in front of anode surface. In the positive anode sheath regime, the diffusion current becomes negative in the near-anode region, which makes the ohmic current increase rapidly in the near-anode region. (3) There is a significant interaction, which is positive feedback, between the diffusion current and anode sheath voltage in both positive and negative anode sheath modes. (4) The thermal conduction from the arc column plays a major role in the heat transfer to the anode for the negative anode sheath mode while it becomes much smaller for the positive anode sheath mode.
机译：在本文中，执行与二维电弧柱模型耦合的阳极护套模型，以研究近阳极区域中的物理过程。在阳极鞘模型中，考虑了两种不同的离子和电子动力学机制，用于正负阳极鞘电压。还考虑了弧柱对阳极的影响。电弧柱模型考虑了热非平衡和电离非平衡。扩散方程和广义欧姆法用于分析阳极区附近等离子体物种扩散的效果。该模型的仿真结果用于大气自由燃烧的氩气弧，电弧电流为50a和150a。模拟表明：（1）为i = 50和150 a获得正负阳极鞘电压。通过模型预测的阳极表面前面的电位的分布与实验数据很好。 （2）在负阳极鞘状态下，扩散电流密度超过总电流密度，这使得在阳极表面前面的电场反向。在正极阳极鞘状态下，近阳极区域中的扩散电流变为负，这使得欧姆电流在近阳极区域中快速增加。 （3）存在显着的相互作用，其在正负阳极鞘模式中的扩散电流和阳极护套电压之间是正反馈。 （4）从电弧柱的热传导在用于负极阳极鞘模式的热传递到阳极中起主要作用，同时对于正阳极鞘模式变小。

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