双流体雾化液滴荷电特性分析  

Analysis of Droplet Charged Characteristics for Twin-fluid Atomization

作　　者：王晓英[1] 王贞涛[1] 顾维锴 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《实验力学》2015年第1期87-93,共7页Journal of Experimental Mechanics

基　　金：国家自然科学基金(51106064)

摘　　要：本文通过理论分析,提出了双流体荷电雾化过程中,增大电场强度或减小液滴粒径均能提高荷电效果的论点。针对不同的电极布置情况建立了数值模拟模型,计算结果表明,双流体喷嘴接地时,喷嘴与环状电极之间的电场强度比喷嘴不接地时大很多。通过实验,验证了电场强度、液滴粒径等参数对荷电效果的影响规律,在环状电极荷电情况下,双流体喷嘴接地时,液体荷质比高于双流体喷嘴不接地时的荷质比;电场强度增大,荷质比增加;液滴粒径越小,荷质比越大;在一定的电导率范围内,电导率越大,荷质比越小。实际喷雾中,运动液滴发生二次破碎的临界荷电量小于Rayleigh极限。An argument is put forward in this paper based on theoretical analysis,that is increasing electric field intensity or decreasing droplet diameter are able to improve the charging effect in twinfluid charging atomization. Taking into account different electrode arrangement,a numerical simulation model was established.Calculation results show that when twin-fluid nozzle is grounded,the electric field intensity between nozzle and annular electrode is much larger than that of ungrounded nozzle.The influence of electric field intensity and droplet diameter on charging effect is verified by experiment.Experimental results indicate that when annular electrode is charged,the charge-mass ratio of twin-fluid grounded nozzle is higher than that of twin-fluid ungrounded nozzle.The chargemass ratio increases with the increase of electric field intensity and with the decrease of droplet diameter.Within a certain electrical conductivity range,the greater the electrical conductivity is,the smaller the charge-mass ratio.In practical atomizing,the critical charge quantity due to moving droplet second crushing is less than Rayleigh limit.

关 键 词：荷质比 电场数值计算 电场特性 双流体雾化 液滴粒径 电导率 

分 类 号：S499[农业科学—植物保护]