Space Charge Transient Kinetic Characteristics in DC Air Corona Discharge at Atmospheric Pressure

作     者：刘兴华 咸日常 孙学峰 王涛 吕学宾 陈素红 杨帆 

作者机构：State Grid Zibo Power Supply Company State Grid Shandong Electric Power Company State Grid Shandong Electric Power Research Institute State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2014年第16卷第8期

页      面：749-757页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the Major State Basic Research Development Program of China(973 Program)(No.2011CB20941) Scientific Research Foundation of State Key Lab. of Power Transmission Equipment and System Security of China(No.2007DA10512709102) National Natural Science Foundation of China(No.51007096) the Fundamental Research Funds for the Central Universities of China(No.CDJZR10150001) 

主　　题：air corona discharge atmospheric pressure numerical simulation mechanism 

摘      要：Investigating the corona mechanism plays a key role in enhancing the performance of electrical insulation systems. Numerical simulation offers a better understanding of the physical characteristics of air corona discharges. Using a two-dimensional axisymmetrical kinetics model, into which the photoionization effect is incorporated, the DC air corona discharge at atmosphere pressure is studied. The plasma model is based on a self-consistent, multi-component, and con- tinuum description of the air discharge, which is comprised of 12 species and 22 reactions. The discharge voltage-current characteristic predicted by the model is found to be in quite good agree- ment with experimental measurements. The behavior of the electronic avalanche progress is Mso described. 0＋ and N＋ are the dominant positive ions, and the values of 0- and 02 densities are much smaller than that of the electron. The electron and positive ion have a low-density thin layer near the anode, which is a result of the surface reaction and absorption effect of the electrode. As time progresses, the electric field increases and extends along the cathode surface, whereas the cathode fall shrinks after the corona discharge hits the cathode; thus, in the cathode sheath, the electron temperature increases and the position of its peak approaches to the cathode. The present computational model contributes to the understanding of this physical mechanism, and suggests ways to improve the electrical insulation system.