Dynamic characteristics of multi-arc thermal plasma in four types of electrode configurations  

作　　者：Yanjun ZHAO Guohua NI Wei LIU Hongmei SUN Siyuan SUI Dongdong LI Huan ZHENG Zhongyang MA Chi ZHANG 赵彦君;倪国华;刘卫;孙红梅;隋思源;李冬冬;郑瓛;马中洋;张弛(Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People’s Republic of China;University of Science and Technology of China,Hefei 230026,People’s Republic of China;Anhui Province Key Laboratory of Medical Physics and Technology,Hefei 230031,People’s Republic of China)

机构地区：[1]Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People’s Republic of China [2]University of Science and Technology of China,Hefei 230026,People’s Republic of China [3]Anhui Province Key Laboratory of Medical Physics and Technology,Hefei 230031,People’s Republic of China

出　　处：《Plasma Science and Technology》2022年第5期183-194,共12页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(No.11875295);the National Key R&D Program of China(No.2019YFC0119000)。

摘　　要：The enhanced volume of thermal plasma is produced by a multi-arc thermal plasma generator with three pairs of discharge electrodes driven by three directed current power suppliers.Combined with a high-speed camera and an oscilloscope,which acquire optical and electric signals synchronously,the dynamic behavior of different kinds of multi-arc discharge adjusted by the electrode arrangement is investigated.Also,the spatial distributions and instability of the arc discharge are analyzed in four electrode configurations using the gray value statistical method.It is found that the cathodic arcs mainly show a contracting state,while the anodic arcs have a trend of transition from shrinkage to a diffusion-like state with the increase of the discharge current.As a result of the adjustment of the electrode configuration,a high temperature region formed in the center of the discharge region in configurations of adjacent electrodes with opposite flow distribution and opposite electrodes with swirl flow distribution due to severe fluctuation of arcs.The discharge voltage rises with increased discharge current in this novel multi-arc plasma generator.It is also found that anode ablation mainly occurs on the conical surface at the copper electrode tip,while cathode erosion mainly occurs on the surface of the inserted tungsten and the nearby copper.

关 键 词：multi-arc electrode configuration dynamic character EROSION 

分 类 号：O53[理学—等离子体物理]