电极旋转运动过程中直流空气电弧的动态分析  

Dynamic Analysis of DC Air Arc During Rotating Motion of Electrode

作　　者：周旭 曹云东[1] 付思 侯春光[1] ZHOU Xu;CAO Yundong;FU Si;HOU Chunguang(Institute of Electrical Apparatus New Technology and Application , Shenyang University of Technology,Shenyang 110870,China;College of Chemical Process Automation,Shenyang University of Technology,Shenyang 111003 ,China)

机构地区：[1]沈阳工业大学电器新技术与应用研究所,辽宁沈阳110870 [2]沈阳工业大学化工过程自动化学院,辽宁沈阳111003

出　　处：《电器与能效管理技术》2019年第12期20-26,共7页Electrical & Energy Management Technology

基　　金：辽宁省教育厅科学技术研究项目(LGD2016033)

摘　　要：针对电极旋转运动过程中直流空气电弧动态特性的研究,提出直线+旋转运动的电极运动方案,并与电极直线运动过程中电弧的动态特性进行对比分析。为此,以磁流体动力学(MHD)为基础,建立三维直流空气电弧的数学模型,通过多物理场耦合仿真得到两种电极运动方式对直流空气电弧运动过程中弧根位置、弧柱体流速、电弧温度的对比分布,并与实验进行了对比分析。分析表明:电极直线+旋转运动较电极直线运动,加大了阴极弧根与阳极弧根的相对位置偏差,使得电弧有了更大的运动空间,从而加速弧柱体的流动,造成电弧温度下降得更快,缩短了电弧的燃弧时间,更有利于电弧的熄灭。Aiming at the study of dynamic characteristics of DC air arc in the process of electrode rotating motion,this paper presented a scheme of electrode moving in straight line with rotating motion,and compared the dynamic characteristics of arc with that of electrode moving in straight line.Therefore,based on the theory of magnetohydrodynamics( MHD),amathematical model of three-dimensional DC air arc was established. The comparative distribution of arc rootposition,arc column velocity and arc temperature during DC airarc motion was obtained by multi-physical field coupling simulation,and compared with the experiment. The analysis shows that the linear motion with rotating mode enlarges therelative position deviation between the cathode arc root andthe anode arc root compared with the linear motion of the electrode,so that the arc has more space to move,thus accelerating the flow of the arc column,resulting in a fasterdrop of the arc temperature,and shortening the arc ignitiontime,which is more conducive to the extinction of the arc.

关 键 词：电极旋转运动 直流空气电弧 动态特性 直线+旋转运动 磁流体动力学(MHD) 

分 类 号：TM561[电气工程—电器]