喷嘴结构对微等离子弧输出特性影响的数值仿真与验证

发布时间：2018-04-22 01:16

本文选题：微等离子弧 + 数值模拟　；参考：《中国表面工程》2017年03期

【摘要】：通过数值模拟和试验研究相结合的方法,在考虑微等离子喷枪喷嘴结构的条件下,建立了大气压下脉冲放电微等离子弧的数值模型,重点研究了喷嘴孔径、喷嘴工件距、阴极内缩量以及电流大小对微等离子弧的影响,并通过光谱仪来表征微等离子弧作用的温度分布。结果表明:喷嘴结构对微等离子弧的形成与稳定有重要影响:在有效压缩距离点内,喷嘴孔径的减小以及喷嘴工件距离的缩近才对工件温度的提高有显著影响;一定范围内,工件的温度随电流的增大而增大;阴极内缩量对工件的温度影响不大。微等离子弧温度场的数值模拟结果与光谱仪测量结果基本一致,验证了模型的可靠性。
[Abstract]:The numerical model of pulse discharge microplasma arc under atmospheric pressure was established by combining numerical simulation and experimental study. The nozzle aperture and nozzle workpiece distance were studied. The effect of the amount of condensation in the cathode and the current on the microplasma arc is studied. The temperature distribution of the microplasma arc is characterized by spectrometer. The results show that the structure of the nozzle has an important effect on the formation and stability of the microplasma arc: in the effective compression distance, the decrease of nozzle aperture and the reduction of the distance between the nozzle and the workpiece have a significant effect on the increase of the temperature of the workpiece, and within a certain range, The temperature of the workpiece increases with the increase of current, and the amount of condensation in the cathode has little effect on the temperature of the workpiece. The numerical simulation results of the microplasma arc temperature field are in good agreement with the measured results of the spectrometer, which verifies the reliability of the model.
【作者单位】：华中科技大学材料成形与模具技术国家重点实验室;
【基金】：国家科技重大专项(2012ZX04010-081)~~
【分类号】：TG456.2

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