基于FLUENT的等离子弧数值模拟-CAMEO-计算机辅助多物理场.PDF

《热加工工艺》 年 月第 卷 第 期 2014 2 43 3 基于FLUENT 的等离子弧数值模拟 翟 泽， 许四祥， 郭宏晨， 丁 刚 (安徽工业大学机械工程学院， 安徽 马鞍山 243002) 摘 要：以磁流体动力学为理论依据建立了转移型等离子弧的数学模型，利用FLUENT 软件耦合求解质量、动量、能 量守恒方程以及麦克斯韦方程组，得出了等离子弧的温度场和速度场等分布。 同时分析了不同电流、气流量对等离子弧能 量及形态分布变化的影响。 结果表明，阴极电流越大，等离子弧的温度越高，速度、电弧压力也越大，弧的高温区向阳极扩 张；大的离子气流量加强了喷嘴对电弧的热压缩作用，电弧直径被迫缩小，因此能得到更高能量密度的等离子弧。 关键词：等离子弧； 数值模拟； FLUENT ； 温度场 中图分类号： G456.2 文献标识码： 文章编号： 3814(2014)03-0199-04 T A 1001- Numerical Simulation on Plasma Arc Based on FLUENT ZHAI Ze, XU Sixiang, GUO Hongchen, DING Gang (Mechanical Engineering Institute, Anhui University of Technology, Maanshan 243002, China) 库 ： mathematical model of transfer-type plasma arc was set up according to the theory of Abstract A magnetohydrodynamics. The fields of temperature, velocity of the plasma arc were calculated by solving the conservation equations of mass, momentum, and energy, as well as the Maxwells equations with the FLUENT. The effects on the plasma 例 arc were studied by different current, the gas flow were studied in detail. The bigger the current of the cathode is , the higher the temperature, velocity and pressure of the plasma arc are. With the increase of the current, the high-temperature region of 案 the arc expands toward the anode gradually. The large gas flow can enhance the thermal compression effect of the nozzle to E the arc. So, the diameter of the arc is shortened and t