两相体放电中的粒径效应  

Effects of the Size of Macroparticles on Two-phase Mixture Discharges

作　　者：邓鹤鸣[1] 何正浩[1] 马军[1] 许宇航[1] 张召亮[1] 李劲[1] 

机构地区：[1]华中科技大学环境科学与工程学院,湖北省武汉市430074

出　　处：《中国电机工程学报》2010年第22期135-142,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50237010);科技部中加科技合作基金项目(2009DFA92810)~~

摘　　要：两相体放电是指大量液体或固体颗粒物悬浮于气体中,或大量气泡悬浮于液体中的放电现象。为了解两相体放电的影响因素,采用21种不同介质颗粒来产生两相体,在分析测定了两相体中非气相物质的颗粒粒径的基础上,通过实验研究了两相体放电特性,发现了两相体体系的击穿电压及两相体对放电路径的影响存在颗粒粒径的影响远大于颗粒物材料影响的"粒径效应"。分析表明,两相体放电中的粒径效应是两相体颗粒对电场的畸变和两相体颗粒与粒子(电子、光子和离子)间的作用联合影响的结果。The two-phase mixture （TPM） discharge is what occurs under the condition that large amounts of liquid or solid macroparticles float in air, or bubbles of high concentration exist in liquid. On the basis of size measurement of 21 kinds of non-air macroparticles composing TPMs and directly comparative analysis of the percentages of the discharge path in air or TPMs, it revealed whether TPMs are beneficial to the discharge development or not in terms of discharge voltage and path selection mainly depends on the macroparticles’ size other than material, i.e. regardless of organic or inorganic, solid or liquid state, which is called macroparticle-size effect. These macroparticles in TPMs distorted the electrostatic field, interacted with ions, electrons or photons, and produced corresponding enhancement or decrease in ionization and excitation as the avalanche front encountered them, but the details about degree of alterations on avalanches highly correlated with the macroparticles’ size.

关 键 词：粒径效应 两相体 放电 路径选择 体积分数 冲击电压 

分 类 号：TM853[电气工程—高电压与绝缘技术]