中文摘要：

基于纳维-斯托克斯方程组、能量守恒方程、麦克斯韦方程组建立二维轴对称TIG焊电弧模型,借助Fluent软件模拟电弧燃烧的整个过程。通过UDF命令将氩气的物理特性随温度的变化、动量方程的源项、钨极边界的电流密度分布等动态地连接到计算模型中,并通过UDS命令添加电流连续性方程。模拟的结果显示,电弧温度场呈钟罩形,电弧压力在轴向上最大,氩气的物理特性随电弧温度场变化,轴向电流密度沿轴向不断减小,径向电流密度呈高斯分布。

英文摘要：

Based on Navier-Stokes equations, energy conservation equations, Maxwell equations, the two-dimensional axisymmetric TIG arc model was established. By Fluent software, the process of arc burning was simulated. The physical properties of argon with the change of the temperature, the source term of the momentum equations, and the current density distribution of the tungsten were added dynamically to the calculated model through the UDF command, and through the UDS command, the current continuity equation was added. The simulated results show that the shape of arc temperature field is a bell, the maximum arc pressure is located in the axial direction, and the physical properties of argon differ from the temperature field.The current density of z direction decreases along the axial, and the current density of r direction shows Gauss distribution. The simulation results are in good agreement with the experiment results of the related literature.