Stability of alternating current gliding arcs
Stability of alternating current gliding arcs
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DOI：
10.1140/epjd/e2014-50343-8
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发表时间：
2014-10
期刊：
影响因子：
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通讯作者：
Y. Kusano;M. Salewski;F. Leipold;Jiajian Zhu;A. Ehn;Zhongshan Li;M. Aldén
中科院分区：
文献类型：
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作者：
Y. Kusano;M. Salewski;F. Leipold;Jiajian Zhu;A. Ehn;Zhongshan Li;M. Aldén
滑动弧是一种淬火等离子体，可以在大气压下作为非热等离子体运行，因此适合于大规模的等离子体表面处理。为使其在实际工业中使用，应在环境空气中稳定地延伸。基于欧姆定律的简单解析计算表明，交流滑动弧放电柱的临界长度可以大于相应的直流滑动弧放电柱的临界长度。这一发现得到了之前发表的交流和直流滑动弧线图像的支持。分析表明，提高交流频率、减小串联电阻、降低气体流量可以增加临界长度。实验证明了气体流量随弧长的变化规律。改变间隙宽度以研究最优的电极设计，因为延长的非平衡放电可以由于最近电极间隙处的弧光放电的点燃而被消除。实验发现，间隙越大，放电柱越长。
A gliding arc is a quenched plasma that can be operated as a non-thermal plasma at atmospheric pressure and that is thus suitable for large-scale plasma surface treatment. For its practical industrial use the discharge should be extended stably in ambient air. A simple analytical calculation based on Ohm’s law indicates that the critical length of alternating current (AC) gliding arc discharge columns can be larger than that of a corresponding direct current (DC) gliding arc. This finding is supported by previously published images of AC and DC gliding arcs. Furthermore, the analysis shows that the critical length can be increased by increasing the AC frequency, decreasing the serial resistance and lowering the gas flow rate. The predicted dependence of gas flow rate on the arc length is experimentally demonstrated. The gap width is varied to study an optimal electrode design, since the extended non-equilibrium discharge can be extinguished due to the ignition of an arc discharge at the closest electrode gap. It is experimentally found that as the gap is wider, the discharge column tends to be longer.