考虑阳极蒸汽微过程的HCVA数值模拟

Xiaolong Huang, Lijun Wang, Xiao Zhang, S. Jia, Z. Shi
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引用次数: 2

摘要

当电弧电流较大时,注入阳极的热流密度较大,导致阳极温度升高,导致蒸发原子进入电弧柱。本文建立了考虑阳极蒸汽电离和复合的真空电弧MHD模型。得到了阳极蒸气和微过程对电弧柱的影响。模型中考虑了质量、动量和能量交换。此外,还考虑了电离和复合过程对VA电磁过程的影响。在模拟结果中,得到了阳极蒸气、阴极等离子体和伏安分布。当阳极温度足够高时,阳极中性蒸气进入电弧柱,在阳极蒸气与阴极等离子体界面处发生强电离。阳极中性蒸汽对电弧柱有明显的冷却作用。阳极中性蒸气是否进入电弧柱,与阳极中性蒸气与阴极等离子体的平衡有关。
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Numerical simulation of HCVA with considering the micro process of anode vapor
When the arc current is high, the heat flux density injecting into anode will be large and lead to the higher anode temperature, driving the evaporated atoms into arc column. In this paper, the MHD model of vacuum arc considering ionization and recombination of anode vapor is built. The influence of the anode vapor and the micro processes on the arc column is obtained. In the model, the mass, momentum and energy exchange are considered. Additionally, the influence of ionization and recombination process on the electromagnetic process of VA is also considered. In the simulation results, the anode vapor, cathode plasma and VA distribution are all obtained. When the anode temperature is high enough, the anode neutral vapor will enter into arc column, and the strong ionization happens at the interface of anode vapor and cathode plasma. The anode neutral vapor has obviously cooling effect on the arc column. Whether the anode neutral vapor will enter into the arc column or not, is related to the balance between the anode neutral vapor and the cathode plasma.
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