高电压技术2013，Vol.39Issue(7)：1655-1660,6.DOI:10.3969/j.issn.1003-6520.2013.07.017
外部磁场对直流电弧等离子体放电特性的影响及其机理
Influence and Its Mechanism of External Magnetic Field on DC Arc Plasma Jet
摘要
Abstract
It is a promising measure to generate relatively uniform arc plasma by making the arc rotated through external magnetic field for improving the quality of plasma spraying.Using a high-speed video camera and virtual instrument technology,we measured the movement of anode arc root and the fluctuation of arc voltage of DC arc plasmas driven by non-uniform magnetic field under atmospheric pressure.The results show that,compared with the arc in the absence of external magnetic field,the arc root turns,the curve of the volt-ampere characteristic shifts up,and power of the DC arc plasma torch increases due to the rotational force and the stable arc force caused by the external magnetic field.In addition,since the plasma jet was expanded in radial direction at the nozzle due to highspeed movement,its cross section increased,and the homogeneity of plasma jet was increased.It is concluded that the external magnetic field can improve the basic characteristics of DC arc plasma torch,which is quite meaningful for further application of DC arc plasma.关键词
直流电弧等离子体炬/外部磁场驱动/旋转阳极弧根/电弧电压波动/伏安特性曲线/等离子体射流Key words
DC arc plasma torch/external magnetic field driving/rotational arc root/arc voltage fluctuation/current voltage curves/plasma jet引用本文复制引用
胡明,万树德,夏洋洋,任真诚,邱志坚..外部磁场对直流电弧等离子体放电特性的影响及其机理[J].高电压技术,2013,39(7):1655-1660,6.基金项目
国家重点基础研究发展计划(973计划)(2008CB717800) （973计划）
Project supported by National Basic Research Program of China(973Program) (2008CB717800). （973Program）
