双毛细管静电雾化电场特性研究  

Characteristics of Electro-field in Electro-hydrodynamics Atomization with Double Capillary

作　　者：王贞涛[1] 张永辉[1] Sau Amalendu 夏磊[1] 詹水清[1] 

机构地区：[1]江苏大学能源与动力工程学院,镇江212013 [2]庆尚国立大学机械与航空学院,晋州660701

出　　处：《农业机械学报》2016年第12期62-69,76,共9页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(51106064);江苏大学青年基金扶持计划项目(FCJJ2015001);江苏大学青年骨干教师培养工程项目;江苏省高校优势学科建设工程项目

摘　　要：为探究毛细管电极形成的空间电场对静电雾化过程的影响,建立了适用于单、双毛细管静电雾化的实验系统,并采用高速数码摄像机记录了无水乙醇的静电雾化过程,通过系统分析雾化图像获得了滴状、纺锤形、脉动锥射流、旋转锥射流、稳定锥射流和多股射流等典型的静电雾化模式;并依据锥射流雾化模式下对应的实验工况,利用静电场叠加原理与椭圆积分方法,对单、双毛细管静电雾化电极产生的空间电场进行了理论分析与数值计算。研究结果表明:单、双毛细管电极的轴线上电场强度最大,电场强度随着φ(空间中的任意一点P与毛细管轴线正向的夹角)的增大而减小,随着r(原点O与点P的距离)的增大而减小;与毛细管单电极相比,相同条件下,毛细管双电极中间区域的径向电场强度减小,轴向电场强度增大,非相干区域的电场强度均增大;毛细管双电极的空间电场的分布使得静电雾化产生的射流与雾滴群等呈现"八"字状,即偏离双毛细管几何对称面向外倾斜。In order to investigate the effect of electric field formed by charged capillary on electrostatic atomization process, an electrostatic atomization system which was suitable for a single or double capillary was designed. Based on the electrostatic atomization system, a study on the atomization mode with ethanol was experimented, and the electro-spraying images were continuously recorded in memory by using high-speed camera. The dripping mode, spindle mode, oscillating-jet mode, precession mode, cone jet mode and multi-jet mode were obtained by systematically analyzing plenty of electrostatic atomization pictures. Under the experimental condition of the cone jet mode, based on the superposition principle of electric field and elliptic integral method, electric field of the single and double capillary electrode space was carried out by theoretical analysis and numerical calculation. The research results showed that electric field strength along the axis of capillary electrode reached its maximum value. The electric field was decreased with the decrease of ~ and r, which represented the angle of point P to capillary axis in positive direction and the distance between points of O and P. Compared with single capillary under the same conditions, the electric field strength between the two capillaries along radial direction was decreased, while it was increased along axial direction. The angle between electric field and jet axis was from -9° to -2°. The electric field formed by the double capillary electrode was symmetrical with respect to x = 0. 5h plane, and the electric field intensity generated around each capillary was opposite in the x direction. Due to the characteristics of the electric field produced by two capillaries, the droplets formed by electrostatic atomization were deviated from the geometrical symmetry of the capillary.

关 键 词：毛细管 静电雾化 雾化模式 锥射流 电场分布 

分 类 号：S491[农业科学—植物保护]