Unified Non-equilibrium Modelling of Tungsten-Inert Gas Microarcs in Atmospheric Pressure Argon
Unified Non-equilibrium Modelling of Tungsten-Inert Gas Microarcs in Atmospheric Pressure Argon
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DOI：
10.1007/s11090-019-10020-x
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发表时间：
2019-11-01
影响因子：
3.6
通讯作者：
Uhrlandt, D.
中科院分区：
文献类型：
--
作者：
Baeva, M.;Loffhagen, D.;Uhrlandt, D.
采用统一的一维模型对0.4mm长的钨-惰性气体微弧等离子体参数进行了分析。该模型求解了等离子体中电子和重粒子的粒子守恒和能量守恒方程，以及阴极中的热传导方程。电子和离子的粒子输运与Poison方程耦合。在电流密度为-10（6）A/m（2）的情况下，详细讨论了带电粒子密度、电势和电场的空间分布、电流密度的分量、电子和重粒子的加热机制和温度。在电流密度为5.3 × 10（3）~ 2.3 × 10（6）A/m（2）的范围内，获得了放电电压、德拜长度估计值、近电极电压降和电极附近空间电荷区域的厚度。
Analysis of the plasma parameters of a tungsten-inert gas microarc with a length of 0.4 mm is carried out by means of a unified one-dimensional model. The model solves the fluid equations for the particle and energy conservation of the electrons and the heavy species in the plasma, and the heat conduction in the thermionic cathode. The particle transport of the electrons and the ions is coupled with the Poison's equation. The spatial distributions of the densities of the charged particles, the electric potential and field, the components of the electric current density, the heating mechanisms and the resulting temperatures of the electrons and heavy particles are discussed in detail for an electric current density of -10(6) A/m(2). The discharge voltage, estimates of the Debye length, the near-electrode voltage drop, and the thickness of the regions of space charge adjacent to the electrodes are obtained for current densities in the range from 5.3 x 10(3) up to 2.3 x 10(6) A/m(2).