高电压技术2013，Vol.39Issue(7)：1649-1654,6.DOI:10.3969/j.issn.1003-6520.2013.07.016
轴向磁场对焊接电弧作用的数值模拟研究
Simulation of Welding Arc in Axial Magnetic Field
摘要
Abstract
Numerical simulation of welding arc in axial magnetic field (AMF) at atmospheric pressure is performed with an ideal magnetic hydromechanics dynamics (MHD) model of coupled plasma and cathode.Hence the mechanism of the welding arc affected by the AMF is analyzed.The calculation results indicate that,with the increase of AMF,the cathode arc root and the arc column near the cathode shrink,the plasma temperature near the cathode increases,the arc column near the anode expands radically,yet the core temperature decreases; the current density and the pressure of the anode arc root are both torus in configuration,the heated area of the anode increases,the plasma temperature near the anode decreases,the maximum temperature of the anode surface decreases,a temperature flat appears,and the heat transferred to the anode increases.The AMF produces a "magnetic sucking"effect through inducing arc rotating near the anode by the Lorentz effect which will enhance upstream cooled gas flow.The effect of low pressure in plasma core,together with the cooling effect by upstream cool gas,will shrink the cathode arc root and the arc column near the cathode.The shrinkage of the cathode root enhances the cathode jet,as a result,the expansion of arc column near the anode is limited.关键词
焊接电弧/阴极弧根/轴向磁场/磁抽吸/阴极射流/电弧等离子体位形Key words
welding arc/cathode arc root/axial magnetic field/magnetically sucking/cathode jet/arc plasma configuration引用本文复制引用
王城,陈塘,查俊,白冰,夏维东..轴向磁场对焊接电弧作用的数值模拟研究[J].高电压技术,2013,39(7):1649-1654,6.基金项目
国家自然科学基金(11035005 （）
50876101 （）
10675122) （）
Project supported by National Natural Science Foundation of China(11035005,50876101,10675122). （11035005,50876101,10675122）
