自由燃烧电弧中传热与流动的数值模拟

MODELING OF THE HEAT TRANSFER AND FLUID FLOW IN A FREE-BURNING ARC

本文对自由燃烧电弧中传热与流动进行了数值模拟，计算域除包括电弧本身外，还包括阴极与阳极。为了避免等离子体鞘层中复杂的物理过程给模拟所带来的困难，对阴、阳极鞘层分别进行了简化处理。文中讨论了不同形式的能量方程及其离散格式对计算结果的影响。并在求解能量方程时，考虑了电极－等离子体交界面处特殊的传热机理。

Modeling results concerning a free-burning argon arc are presented in this paper. The calculation domain includes the arc itself and the electrodes. Temperature- dependent plasma properties at LTE state are employed for the arc region, while the electrode sheaths are treated with a simplified method. The effects of using different types of energy equation and its discretization schemes on the numerical results are examined. Special treatments at the plasma-electrode interfaces are also adopted in the modeling.