High-current vacuum arc under axial magnetic field: Numerical simulation and comparisons with experiments
High-current vacuum arc under axial magnetic field: Numerical simulation and comparisons with experiments
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DOI：
10.1063/1.2388734
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发表时间：
2006-12
影响因子：
3.2
通讯作者：
Lijun Wang;S. Jia;Z. Shi;M. Rong
中科院分区：
文献类型：
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作者：
Lijun Wang;S. Jia;Z. Shi;M. Rong
基于磁流体动力学模型，对大电流真空电弧进行了数值模拟。该模型考虑了能量守恒方程中的动能项和离子粘度项。与超声速压缩真空弧相比，HCVA内的离子流处于亚音速状态。因此，HCVA需要调整阴极和阳极两侧的边界条件。根据HCVA的模拟结果，我们可以发现最大的等离子体压力出现在阴极侧附近。HCVA的特性与超音速真空电弧有明显不同。然后，将仿真结果与实验结果（如电子数密度、电子温度、离子温度、高速电荷耦合器件照片等）进行比较。仿真结果与实验结果吻合较好。此外，我们还分析了不同电弧模型对阳极侧电流密度分布的影响。
Based on a magnetohydrodynamic model, a numerical simulation of high-current vacuum arc (HCVA) is carried out. In this model, the kinetic energy terms and ion viscosity terms in energy conservation equations are considered. Compared with the supersonic constricted vacuum arc, the ion flow in HCVA is in the subsonic status. Therefore, boundary conditions of cathode and anode sides have to be adjusted for HCVA. According to the simulation results of HCVA, we can find that the maximal plasma pressure appears near the cathode side. The characteristics of HCVA are significantly different from those of supersonic vacuum arc. Then, we make the comparisons between simulation results and experimental results (such as electron number density, electron temperature, ion temperature, high speed charge-coupled device photographs, and so on). The simulation results are in agreement with the experimental results. In addition, we also analyze the influence of different arc models on the distribution of current density in the anode side.