摘要
阴极弧根为电子发射的主要区域,弧根的运动对空气直流电弧等离子体特性有重要意义。通过电极旋转驱动阴极弧根运动,实验观测得到电极旋转情况下空气直流电弧拉弧过程电极表面烧蚀情况、扭曲的弧柱形态,同时提取并对比了直线拉弧和旋转拉弧的电弧电压上升曲线。参照临界电流试验条件,建立小电流下平行电极间三维电弧仿真模型,探究在小电流情况下,自由燃烧态电弧的演变过程。仿真结果表明:阴极弧根运动使得发射后极间带电粒子空间分布变化,间隙放电通道改变,电弧的最大温度值降低;当电弧放电通道不稳定时,极间电弧电压出现波动,电弧能量包络空间相对变小,间隙中高能粒子较少,有利于电弧能量的空间逸散。
It is well known that the cathode arc root is the main area of electron emission.The arc root motion is of great significance to the characteristics of air DC arc plasma.The root motion of cathode arc root is driven by the electrode rotation.The electrode surface ablation and the twisted arc column configuration during the arc drawing period of air DC arc under the rotation of electrode are observed by the experiment.At the same time,the arc voltage rise curve under the straight and rotation arc drawing is extracted and compared.With reference to the critical current test condition,a 3D arc simulation model between parallel electrodes under low current is set up to explore the evolution of free-burning arc under small current.The simulation result shows that the spatial distribution of charged particles between the emitted electrodes is changed by the motion of the cathode root.As the change of discharge channel between gap,the maximum temperature of the arc decreases.In case of unstable arc discharge channel,the fluctuation of arc voltage between the electrode occurs.While the arc energy enveloped space is changed relatively small and there are fewer high-energy particles in the gap,which is conducive to the space dissipation of arc energy.
作者
付思
陈文清
曹云东
FU Si;CHEN Wenqing;CAO Yundong(Shenyang University of Technology,Shenyang110870,China)
出处
《高压电器》
CAS
CSCD
北大核心
2023年第11期224-230,共7页
High Voltage Apparatus
基金
国家自然科学基金(51977132)
辽宁省2022年教育厅科学研究(LJKMZ2022513)资助项目。
关键词
空气直流电弧
旋转运动
弧根
电弧电压
能量
DC air arc
electrode rotation motion
arc root
arc voltage
energy
