Numerical study of the anode boundary layer in atmospheric pressure arc discharges
Numerical study of the anode boundary layer in atmospheric pressure arc discharges
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DOI：
10.1088/0022-3727/49/10/105204
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
I. Semenov;I. Krivtsun;U. Reisgen
中科院分区：
文献类型：
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作者：
I. Semenov;I. Krivtsun;U. Reisgen
基于等离子体成分的流体动力学（扩散）方程，对大气压电弧放电中的阳极边界层进行了数值研究。控制方程以统一的方式制定，没有热平衡、电离平衡或准中性的假设。为了进行比较，还考虑了阳极层的准中性模型。数值计算是在阳极层电流密度典型值 (500–2000 A cm−2) 下针对氩弧进行的。数值模拟结果表明，常见的鞘层无碰撞模型无法描述所考虑问题的鞘层区域。为此，利用统一建模的结果对阳极护套进行了详细分析。此外，还分析了阳极层中等离子体参数的分布，并计算了阳极层的基本特性（阳极压降、鞘层压降、阳极层厚度、鞘层厚度、阳极热通量）。我们的结果与现有的理论预测和实验数据非常吻合。还讨论了阳极层特性对电流密度的依赖性。
The anode boundary layer in atmospheric pressure arc discharges is studied numerically on the basis of the hydrodynamic (diffusion) equations for plasma components. The governing equations are formulated in a unified manner without the assumptions of thermal equilibrium, ionization equilibrium or quasi-neutrality. For comparison, a quasi-neutral model of the anode layer is also considered. The numerical computations are performed for an argon arc at typical values of the current density in anode layers (500–2000 A cm−2). The results of numerical modelling show that the common collisionless model of the sheath fails to describe the sheath region for the problem under consideration. For this reason, a detailed analysis of the anode sheath is performed using the results of unified modelling. In addition, the distributions of plasma parameters in the anode layer are analysed and the basic characteristics of the layer (anode voltage drop, sheath voltage drop, anode layer thickness, sheath thickness, heat flux to the anode) are calculated. Our results are found to be in good agreement with the existing theoretical predictions and experimental data. The dependence of the anode layer characteristics on the current density is also discussed.