Abstract：In this paper, two-dimensional transient axisymmetrical model of anode thermal process in vacuum arc under axial magnetic field is established. Based on this model, anode thermal process under different heat flux densities for pure copper electrode is simulated and analyzed under the condition of limited interruption. Through numerical simulation, anode temperature distribution along radial and axial directions can be obtained. Simulation results show that anode temperature is increased gradually with the increase of heat flux density, but the increase increment is reduced due to the intensification of evaporation cooling. The maximum value of anode temperature appears not at peak current value moments, but is lagged. When anode melting appears, the radial distribution curve of anode surface will appear deflection point. Moreover, the decay of anode surface temperature along axial direction is very fast. The distributions of anode melting radius, depth, saturated vapor pressure and vapor flux also can be obtained by simulation. After current zero moment, anode begins to become cooling, however, the cooling velocity is far less than the velocity of temperature rising. Under the condition of limited interruption, the smaller increase of heat flux density to anode will lead to larger increase of saturation vapor pressure and vapor flux. Simulation results are in good agreement with experimental results.
王立军, 贾申利, 刘宇, 杨鼎革, 史萌, 史宗谦. 纵磁下真空电弧阳极热过程的仿真[J]. 电工技术学报, 2011, 26(3): 65-73.
Wang Lijun, Jia Shenli, Liu Yu, Yang Dingge, Shi Meng, Shi Zongqian. Simulation of Anode Thermal Process in Vacuum Arc Under Axial Magnetic Field. Transactions of China Electrotechnical Society, 2011, 26(3): 65-73.
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2011, Vol. 26 
