外加纵向磁场对TIG电弧特性影响的数值分析  

Numerical analysis of influence of external longitudinal magneto-field on TIG arc characteristics

作　　者：黄勇[1] 刘林[1] 陆肃中 王新鑫[1] 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2016年第3期31-34,共4页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51265029)

摘　　要：基于磁流体动力学方程组,建立外加纵向磁场作用下TIG电弧的三维稳态数学模型,并运用FLUENT软件求解,获得不同磁感应强度下电弧的温度场和流场等特征参数.结果表明:与普通TIG电弧相比,在外加纵向磁场作用下,电弧形貌呈现空心钟罩形;阴极附近等离子体温度略有上升,电弧中心区域温度降低;阳极表面电弧压力和热流密度呈双峰分布,且极值降低,阳极加热面积增大.A three-dimensional mathematical model of TIG arc under the action of external magnetic field is established based on the magnetohydrodynamic equations and solved by using software FLUNET.Characteristic parameters of temperature and velocity of the arc under different magnetic induction are obtained.The result shows that compared to common TIG arc,the arc exhibits a hollow bell shape and the plasma temperature near the cathode increases a little.The temperature at arc core will decreases and the arc the pressure and heat flux density on the anode surface will be distributed in the form of double-peaks with lower maximum of the peak values.The heated area of the anode will increase.

关 键 词：TIG电弧 纵向磁场 数值分析 

分 类 号：TG403[金属学及工艺—焊接]