旋杯式静电雾化荷电特性的试验

Experiment of electrostatic spray by rotary cup atomizer

基于旋杯式离心雾化技术和静电雾化技术在药液喷洒过程中的优势,设计了一种旋杯式静电雾化装置.首先对雾化液滴的荷电性能进行试验研究,然后结合高速数码摄影技术探讨了荷电对雾化机理及特性的影响规律.结果表明:旋杯式静电雾化液滴的荷电性能与旋杯边缘液帽或液丝直径的大小有关,液帽或液丝直径越小,雾化液滴的荷质比及其增长速率越大;We数较低时,滴状分裂模式下,增加荷电电压,滴状分裂模式逐渐向丝状分裂模式转变,雾滴索特尔平均粒径逐渐减小;We数较高时,丝状分裂模式下,增加荷电电压对索特尔平均粒径及雾化过程的影响减弱,能够改善雾滴粒径分布的均匀性.

The system of charged spray by rotary cup was designed based on the advantages of rotary cup atomization and electrostatic atomization in spraying pesticide. The charging performance of the new system was investigated. The effects of applied voltage on spray characteristic were discussed with the combination of high-speed camera. The results show that the charging property of droplets atomized by rotary cup is proportion to the diameter of bulge or ligament. The smaller the diameter is,the higher the grow rate of charge-to-mass ratio and the charge-to-mass ratio of droplets are. When We number is small,direction drop formation transits to ligament formation with the increasing of applied voltage,and the diameter of droplet decreases. When We number is big,the effects of applied voltage on the disintegration and diameter of the droplets are weakened,and the uniform of droplet is improved with the increasing of applied voltage.