摘要
为实现静电锥射流雾化所产生液滴的粒径、速度及其空间分布特性的可控性,研究了不同雾化基液、施加电压和供应流量下静电射流的动力学特性.通过高速摄影机记录和分析了不同雾化液体在针-板电极作用下的静电雾化瞬态过程.基于大量高速图像的离线分析,获得了不同物性参数下液滴与弯液面之间液丝形态的差异、脉动锥与稳态锥射流等几种典型射流形态以及丙二醇与正辛醇雾化模式存在的参数范围等结果.研究结果表明:锥射流模式下,射流初始喷射速度接近理论值;丙二醇与正辛醇仅能产生曲张不稳定性破碎;射流破碎点位置随时间变化而改变,主要集中于量纲一的破碎长度(射流破碎长度与毛细管喷嘴外径之比)约等于12的位置;当施加电压或液体供应流量过大时,稳态锥射流模式难以保持,逐渐向分叉射流、非稳态多股射流及摆动射流等非稳态模式转变.
To realize the controllability of droplet size,velocity and spatial distribution characteristics generated by electrostatic atomization,the dynamic characteristics of electrostatic jet under different liquids,electric voltage and flow rate were experimentally investigated.The transient process of the electrostatic atomization was visualized,captured and analyzed through high-speed camera.By analyzing many high-speed images,the morphology difference of liquid filament between liquid drop and meniscus under various liquid properties,typical jet forms of pulsating and stable cone jets,and reference parameters range for propylene glycol and n-octanol in different modes were obtained.The results indicate that in the cone-jet mode,the initial jet velocity from the meniscus is close to theoretical value.The varicose instability is found in the breakup of jet for propylene glycol and n-octanol.The position of jet breaking point is changed with time and is mainly focused around twelve times dimensionless length ratio of jet breaking length to outside diameter of capillary nozzle.When the applied voltage or the liquid flowrate is too large,the stable cone jet mode is difficult to maintain and is gradually transformed into bifurcation,unstable multi-jet,oscillating jet and other unstable spraying modes.
作者
王贞涛
陈永钟
孔茜
杨诗琪
王其锶
岑旗钢
WANG Zhentao;CHEN Yongzhong;KONG Qian;YANG Shiqi;WANG Qisi;CEN Qigang(School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China)
出处
《江苏大学学报（自然科学版）》
CAS
北大核心
2023年第3期344-350,共7页
Journal of Jiangsu University：Natural Science Edition
基金
江苏省自然科学基金资助项目(BK20171301)。
关键词
液滴
静电雾化
带电射流
动力学特性
射流形态
droplet
electrostatic atomization
electrified jet
dynamic characteristic
jet morphology
