论文部分内容阅读
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。
Based on Navier-Stokes equations, energy conservation equation and Maxwell’s equations, a two-dimensional axisymmetric TIG welding arc model was established. The entire process of arc combustion was simulated by Fluent software. The UDF command dynamically changes the physical properties of argon with temperature, the source term of the momentum equation, the current density distribution at the tungsten boundary, etc. into the calculation model, and adds the current continuity equation through the UDS command. The simulation results show that the arc temperature field is bell-shaped, the arc pressure is the largest in the axial direction, the physical properties of argon vary with the arc temperature field, the axial current density decreases along the axial direction, and the radial current density is Gaussian distribution .