棒-板电极直流负电晕放电过程中重粒子特性的仿真研究  

Simulative Study on Characteristic of Heavy Particles in Negative Bar-plate DC Corona Discharge

作　　者：廖瑞金[1] 刘康淋 伍飞飞[1,2] 杨丽君[1] 周之[1,2] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [2]国网四川省电力公司成都供电公司,成都610047

出　　处：《高电压技术》2014年第4期965-971,共7页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2011CB209401)~~

摘　　要：为研究电晕放电过程中的重粒子特性,基于流体动力学模型提出了一种改进的电晕放电混合模型,该模型包含空气放电过程中最主要的6类等离子体化学反应,以及光电离作用和二次电子发射过程。基于上述模型,对棒-板电极在6 kV电压下的负电晕放电过程进行仿真,得到负电晕放电的脉冲波形;并分析了电场强度、净空间电荷密度在单次脉冲过程中随着时间和空间的变化规律,重点讨论了重粒子的组成成分及其分布特性。结果表明,在所有粒子反应中,电子和N2分子发生碰撞电离的反应速率最大,但产生的N2+密度却远小于O4+和O2+。O2-离子是负离子中数量最多的粒子,对电晕放电过程起到抑制作用。O是除N2和O2外含量最高的中性粒子;由于中性粒子在电晕放电过程中的含量较小,因此起到的作用相对较小。In order to investigate the characteristics of heavy particles in corona discharge, we proposed an improved hybrid model of corona discharge based on the hydrodynamic theory. This model includes six main kinds of plasma chemical reactions during the air discharge process, and it also takes consideration that the photoionization effect and secondary electron emission. On the basis of this model, we simulated the negative corona discharge of a bar-plate elec- trode under voltage of 6 kV, and obtained its impulse waveform. In addition, we analyzed the rules of electric field and net space charge density varying with time and space during a single impulse, and emphatically discussed the composition and distribution of heavy particles. The results show that, among all the reactions of particles, the reaction rate of impact ionization between electron and N2 is the highest, while the density of N2＋ is far less than that of O4＋ and O2＋. Moreover, O2-is the major negative ions and it restrains corona discharge. In addition to N2 and O2, O is another major kind of neutral particles, but the effect of neutral particle is relatively weak due to their small amount.

关 键 词：负电晕放电 混合模型 等离子体化学反应 电场强度分布 空间电荷密度分布 重粒子特性 

分 类 号：O461[理学—电子物理学]