大電流真空電弧陽極熔蝕過程的熱力學(xué)仿真研究
[Abstract]:In the process of high current vacuum arc breaking, anode phenomenon plays an important role in successfully breaking. When the arc current exceeds the threshold value, the surface temperature of the anode will exceed the melting point of the material. Metal vapor vaporized by liquid metal and droplets spattered in the anode pool will greatly increase the probability of back-arc breakdown and may result in failure of breaking. In this paper, the fluid flow and heat transfer model of anodic molten pool during high current vacuum arc burning is established. The corrosion, deformation and temperature distribution of the anode surface caused by vacuum high current arc are studied. The heat transfer from the arc plasma to the anode surface and the phase transition process of the surface material under the heat flux are considered in the model. The heat flux and pressure distribution obtained from the magnetofluid simulation results are taken as the boundary conditions for the simulation of the flow and heat transfer in the anode molten pool. The failure process of the anode surface and the variation of the temperature distribution are obtained by the finite volume method. The simulation results show that the temperature distribution and the anodic surface damage caused by the arc are obtained under different currents. It is found that the surface temperature distribution obtained by the simulation model considering the flow and deformation of liquid metal in the molten pool is more uniform. The uniform distribution of contact surface temperature is explained in the experiment. It is proved that the flow of liquid metal is an important factor affecting the temperature distribution. The obtained model more accurately describes the anode phenomenon under the action of high current vacuum arc and provides a theoretical basis for evaluating the breaking capacity of vacuum circuit breaker.
【作者單位】: 電力設(shè)備電氣絕緣國家重點(diǎn)實(shí)驗(yàn)室(西安交通大學(xué));
【基金】:國家重點(diǎn)基礎(chǔ)研究發(fā)展規(guī)劃項(xiàng)目(973計(jì)劃)(2015CB 251002) 國家自然科學(xué)基金(51407135,51323012) 高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金(20130201110005)~~
【分類號(hào)】:TM501.2
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