摘要
根据等离子流体质量、动量及能量守恒方程和麦克斯韦方程组建立等离子弧焊炬的数学模型,通过对不同喷嘴尺寸和结构形状的等离子弧焊炬求解,得到其产生的等离子电弧轴向温度、电流密度及喷嘴出口处沿径向的温度分布。研究了喷嘴通道长、孔径、通道比和喷嘴结构对等离子弧的影响。计算结果表明:等离子弧焊炬喷嘴通道长度在一定范围内缩短,孔径越小,等离子弧的温度越高。
A mathematical model of plasma arc welding torch was set up based on the plasma fluid quality in this paper, momentum and energy conservation equation and Maxwell’s equations. The temperature and current density distribution of plasma arc generated in axial direction as well as radial temperature distribution at the nozzle opening were obtained by resolving different nozzle size and structural shape of the plasma arc welding torch. The effects on the plasma arc welding torch by the nozzle channel length, aperture, aperture to channel ratio and nozzle structure were studied in detail. The calculation results showed that if the nozzle channel length of plasma arc welding torch was shortened within certain scope, the smaller the aperture, the higher the plasma arc temperature.
出处
《焊接技术》
北大核心
2009年第7期11-14,共4页
Welding Technology
关键词
等离子弧焊炬
通道长度
孔径
通道比
数值模拟
plasma welding torch, channel length, aperture, aperture to channel ratio, numerical simulation
