感应荷电喷雾静电场与荷电特性分析  

Electrostatic Induction Field and Charging Property of Droplet in Electrostatic Spraying Process

作　　者：陈汇龙[1] 赵英春[1] 

机构地区：[1]江苏大学能源与动力工程学院,镇江212013

出　　处：《高电压技术》2010年第10期2519-2524,共6页High Voltage Engineering

基　　金：江苏省自然科学基金(BK2007095);江苏大学高级人才科研启动基金(08JDG050)~~

摘　　要：感应荷电喷雾静电场的特性是感应荷电喷雾流场与静电场耦合计算的基础,也是荷电喷雾技术基础理论研究的关键之一。为了了解喷雾静电场中环状电极的感应静电场分布特性,在感应荷电机理分析和静电场物理模型建立的基础上,通过将商用FLUENT计算功能的扩展,对感应荷电喷雾中喷嘴与环状电极静电场进行数值模拟,并对静电场分布特性进行分析,结合感应荷电机理,明确感应静电场分布对喷雾液滴荷电效果的影响,从而可以通过改变静电场的分布特性改善液滴荷电质量。计算结果表明:随着充电电压的增加或电极间距的减小,电极处电场强度增强,尤其是喷嘴电极处增幅明显;电场强度沿轴向衰减迅速,故拥有高场强的电极及其附近区域是液滴感应荷电的关键,研究结论与有关试验结果相符合。因此,较高充电电压或较小电极间距(10mm以下)情况下的喷嘴与环形电极的静电场分布有利于获得较好的荷电效果和喷雾质量。In order to understand the electrostatic induction field property,on the basis of the physical model of electrostatic induction field and the mechanism of induction charging,using an extended commercial FLUENT code,we simulated the distribution of electrostatic induction field generated by ring-like electrode within electrostatic spraying process,and analyzed the effects of distribution of electrostatic field on the charging effect of droplet,so that the charging quantity could be improved as the structure of electrodes were changed.During the simulation process,the electrostatic induction field distribution was obtained,and it was found that the spray quantity of the nozzle had a crucial influence on the charging effect of droplet,as the highest electrostatic field strength was around the nozzle surface,and decreased quickly away from the electrodes.Moreover,the electrostatic field with different changing voltage and different electrodes＇distance was calculated,and results showed that the electrostatic field strength increased especially around the nozzle electrode as the charging voltage increased and the distance between electrodes decreased.The electrostatic field strength weakened rapidly along axial direction,so the area with high electrostatic field strength around the electrodes played an important role in droplet induction charging,which had the good agreement with experiment results.Therefore,the distribution of electrostatic field under a higher charging voltage and smaller distance（less than 10mm）between electrodes would be favorable for charging effectiveness and spray quantity.

关 键 词：感应荷电喷雾 静电场 电极结构 环状电极 电极间距 数值模拟 FLUENT 荷电效果 

分 类 号：O361.4[理学—流体力学]