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叶向艺, 郑振环, 李强. 工艺参数对等离子喷枪内电弧波动影响的三维数值模拟[J]. 焊接学报, 2013, (9): 95-98.
引用本文: 叶向艺, 郑振环, 李强. 工艺参数对等离子喷枪内电弧波动影响的三维数值模拟[J]. 焊接学报, 2013, (9): 95-98.
YE Xiangyi, ZHENG Zhenhuan, LI Qiang. Three-dimensional numerical modeling of influences of process parameters on arc fluctuation in plasma arc torch[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (9): 95-98.
Citation: YE Xiangyi, ZHENG Zhenhuan, LI Qiang. Three-dimensional numerical modeling of influences of process parameters on arc fluctuation in plasma arc torch[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (9): 95-98.

工艺参数对等离子喷枪内电弧波动影响的三维数值模拟

Three-dimensional numerical modeling of influences of process parameters on arc fluctuation in plasma arc torch

  • 摘要: 基于局域热力学平衡假设,建立了三维非稳态等离子电弧的湍流模型,运用计算流体力学软件ANSYS CFX系统地模拟了电弧电流、氩气流量和氢气流量对氩/氢等离子喷枪内电弧波动的影响.结果表明,当电流小于600 A时,增大电流,电弧柱缩短,平均电弧电压和电压波动幅度减小,波动频率升高.当电流大于600 A时,增大电流对电弧波动基本没有影响.增加氩气流量或氢气流量均使得电弧柱增长,平均电弧电压和电压波动幅度增大,波动频率降低.三种工艺参数相比,氢气流量对电弧波动的影响最大,氩气流量次之,电弧电流影响最小.

     

    Abstract: A three-dimensional transient turbulent model of plasma arc was established based on local thermodynamic equilibrium (LTE) to study the effects of arc current,argon flow rate and hydrogen flow rate on arc fluctuation inside the argonhydrogen plasma torch by using computational fluid dynamics software ANSYS CFX.The results show that when the arc current increased but less than 600 A,the arc column became shorter, the average arc voltage and the arc fluctuation decreased, but the fluctuation frequency increased.However,when the arc current increased to above 600 A,it had little influence on the arc fluctuation.The increase of argon flow rate or hydrogen flow rate led to the increase of the arc column,average arc voltage and voltage fluctuation,but decrease of the fluctuation frequency.Among three process parameters,hydrogen flow rate affected the arc fluctuation most,and the arc current did least.

     

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