Phenomena and Mechanism of Positive Pulsed Discharge Branching in Two-phase Mixtures  

作　　者：DENG Heming ZHANG Guangzhou XU Yuhang HE Zhenghao ZHU Hongzhao LIANG Wei 

机构地区：[1]State Grid Electric Power Research Institute, Wuhan 430074, China [2]State Grid Corporation of China, Beijing 100031, China [3]Ximen Power Supply Bureau of Fujian Electric Power Company Ltd., State Grid Corporation of China, Ximen 361004, China [4]Huazhong University of Science and Technology, Wuhan 430074, China

出　　处：《高电压技术》2013年第9期2152-2158,共7页High Voltage Engineering

基　　金：Project supported by National Natural Science Foundation of China(50237010),National Basic Research Program of China(973 Program)(2011CB209400)

摘　　要：Discharge branching is a general phenomenon in atmospheric-pressure air,dense gases,and two-phase mixtures(TPMs).In this work,an ultraviolet imaging device is utilized to investigate the branching of positive pulsed discharges in TPMs.Comparison among the captured images indicates that the branching is caused by the voltages and the macropartilces in the discharge channels combining together.The interaction of macroparticles with ions,electrons or photons is one reason for the branching behavior of pulsed discharges.The generation of electrons at the discharge front closely relates to the work function of dielectric macroparticles,which is a key parameter influencing the electron-emission ability of macroparticle surfaces.The electric field alteration under various applied voltage in TPMs,which is calculated by a two-dimension finite element method,is the other reason for the guiding effect of macroparticles on the streamers compared with in the air.Discharge branching is a general phenomenon in atmospheric-pressure air, dense gases, and two-phase mixtures （TPMs）. In this work, an ultraviolet imaging device is utilized to investigate the branching of positive pulsed discharges in TPMs. Comparison among the captured images indicates that the branching is caused by the voltages and the macropartilces in the discharge channels combining together. The interaction of macroparticles with ions, electrons or photons is one reason for the branching behavior of pulsed discharges. The genera- tion of electrons at the discharge front closely relates to the work function of dielectric macroparticles, which is a key parameter influencing the electron-emission ability of macroparticle surfaces. The electric field alteration under various applied voltage in TPMs, which is calcu- lated by a two-dimension fmite element method, is the other reason for the guiding effect of macroparticles on the streamers compared with in the air.

关 键 词：两相混合物 放电现象 脉冲放电 电子发射能力 机制 TPM 大颗粒 大气压力 

分 类 号：TQ441.41[化学工程—化学肥料工业] TU998.13[建筑科学—市政工程]