憎水性表面水珠的电场计算及放电研究  

Calculation of Electric Field and Study of Discharge on Water Droplets on the Hydrophobic Surface

作　　者：王建武[1] 文习山[1] 刘海燕 欧阳剑萍 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]广东核电工程有限公司,深圳518001 [3]泉州电业局,泉州362000

出　　处：《高电压技术》2006年第11期49-52,共4页High Voltage Engineering

摘　　要：用ANSYS有限元分析软件对不均匀电场(针-板电极)中憎水性表面分离水珠的电场进行了计算,比较了无水珠、单个水珠以及多个水珠存在时憎水性表面沿面电场分布的变化情况,计算出水珠存在引起固、液、气三重介质连接点处的畸变,且水珠的存在对强场区电场的畸变作用更显著。同时在实验室中进行了模拟试验,用10000帧/s的高速数字摄影仪对整个放电过程进行了全程捕捉。结果表明,人工布液方式下憎水性表面分离水珠的放电是存在明显熄灭重燃现象并由两端向中间发展并沿水珠顶部贯通的细小电弧连接所致。This paper uses an ANSYS finite element analysis software to compute the eleetrtc field dtstributions on the hydrophobic surface with no-droplet, one-droplet and multi-droplets in nonuniform electric field （needle-board electrodes）. According to the calculation results, it can be found that the electric field generates distortion around the droplet, and the field strength has been formed in the joint of liquid, solid and gas, and the distortion is more se vere when droplet lies in the stronger electric field. Furthermore, the maximum electric field intensity when there are water droplets on the hydrophobic surface is 2.05- 1.28 times when there is no water droplets on sample surface in the non-uniform electric field. On the purpose of making further study on results the electric field distortion, this paper also designs a simulating test on the model sample to study the discharge process of discrete water droplets on the hydrophobie surface in the non-uniform electric field. The results show that the droplets near needle electrode with highest field intensity on hydrophobic surface produce corona at first, and the corona, arc until breakdown also appear to be more apparent and intense than other position. Moreover, different from hydrophilie surface, pollution flashover discharge on hydrophobic surface in the existence of water droplets appears to have conspicuous extinguis- hing and rekindling phenomena, this is propitious to the enhancement of flashover voltage. Besides, flashover voltage under line form water droplets arrangement is lower than that under other arrangement forms, and that the flashover voltage is related with droplet volume and conductivity under the same droplets arrangement.

关 键 词：不均匀电场 憎水性 电场强度 分离水珠 局部放电 

分 类 号：TM15[电气工程—电工理论与新技术]