电极
弧(几何)
电流(流体)
传热
机械
温度梯度
材料科学
电弧
热力学
化学
机械工程
物理
量子力学
工程类
物理化学
作者
Qirong Wu,Kai Yang,Rencheng Zhang,Ran Tu,Xuejin Zhou
出处
期刊:AIP Advances
[American Institute of Physics]
日期:2021-09-01
卷期号:11 (9)
被引量:7
摘要
Studying the heat transfer characteristics of alternating current (AC) arc-fault to electrodes is a key issue in electrical fires. In this paper, an instantaneous heat transfer numerical model of AC arc-fault is developed based on the magneto-hydrodynamic principle. The temperature distribution of the AC arc at the microseconds level and the influence of heat transfer on electrodes at the seconds level when the arc heats are studied. The numerical simulation of the axial temperature of the electrodes is verified by experiments, and the temperature variation in the electrodes at different currents and times is discussed. The results show that the arc temperature varies periodically similar to the current at the microseconds level but it does not go out when the current passes zero. The high-temperature region of electrodes diffuses with the increase in current or time. However, the axial temperature gradient of the electrode decreases with time and increases with current. Furthermore, the range of temperature increase in the electrode position decreases with the increase in current and time, but the electrode position near the arc has a higher initial temperature increase.
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