气流量对磁控直流等离子体炬传热与流动特性的影响

Effects of Gas Flow Rate on Heat Transfer and Flow Characteristics in a DC Plasma Torch Controlled by Magnetic Field

以磁控直流等离子体炬为研究对象,根据磁流体动力学模型,利用二次开发的FLUENT软件对炬内多耦合场进行仿真,模拟和分析入口气流量对等离子体炬传热与流动的影响。结果表明,入口气流量越大,炬出口等离子体的温度越低,轴向速度越大,径向速度和旋转速度越小。

The DC plasma torch controlled by magnetic field was investigated. According to the magnetohydrodynamic(MHD) model, the multiple coupling fields in the torch were simulated with the second-developed FLUENT software. The effects of gas flow rate on heat transfer and flow characteristics were calculated and analyzed. The results show that the larger the gas flow rate is, the lower the temperature at the torch outlet is, the larger the axial velocity at the torch outlet is, and the smaller the radial velocity and swirl velocity at the torch outlet are.