不同结构参数对喷头雾化特性的影响规律  

Influence of different structural parameters on atomization characteristics of nozzle

作　　者：冯静之 朱兴业[1,2] 华珊 钱兆 刘俊萍 FENG Jingzhi;ZHU Xingye;HUA Shan;QIAN Zhao;LIU Junping(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Key Laboratory of Agricultural Equipment for Hilly and Mountainous Areas in Southeastern China(Co Construction by Ministry and Province),Ministry of Agriculture and Rural Affairs,Hangzhou,Zhejiang 310022,China)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013 [2]农业农村部东南丘陵山地农业装备重点实验室(部省共建),浙江杭州310022

出　　处：《排灌机械工程学报》2024年第4期426-432,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：江苏省重点研发计划项目(BE2022351);江苏大学农业装备学部项目(NZXB20210101);农业农村部东南丘陵山地农业装备重点实验室(部省共建)开放基金项目(QSKF2023007)。

摘　　要：针对目前雾化喷嘴存在的雾化压力高、雾化范围小等问题,设计了一种雾化喷头,并分析了该喷头的雾化特性.利用激光粒度测试仪探究压力为0.15~0.30 MPa、出口直径为0.3~0.9 mm等条件下对喷头雾化锥角、速度场和液滴粒径的影响,获取了不同试验条件下流场流动特性的变化规律:在低压力下,雾化锥角受喷头出口直径的影响较大,出口收缩角越大则雾化特性越优良;出口直径为0.9 mm的喷头,喷腔长孔比为1、出口收缩角为75°时更能实现大范围的作业;随着喷雾压力增大,水滴速度最大值也显著增大,但压力对雾化流场整体速度分布趋势的影响不大.水滴直径也随着喷头出口直径增大而增大,且喷头出口直径对水滴直径影响显著,但水滴直径相同时,出口直径越大,水滴速度越小.该结果为雾化喷头在中低压范围内的应用提供了理论参考.Aiming at solving the problems of high atomization pressure and small atomization range in the development of current atomization nozzles,a new atomization nozzle was designed,and its atomization characteristics were analyzed.A laser particle size tester was used to investigate the effects of pressure(0.15-0.30 MPa)and different outlet diameters(0.3-0.9 mm)on the nozzle atomization cone angle,velocity field,and droplet size,to obtain the changed rules of flow characteristics of the flow field under different test conditions.It is found that under low pressure,the atomization cone angle is greatly affected by the nozzle outlet diameter,and the larger the outlet contraction angle,the better the atomization characteristics.The nozzle with a outlet diameter of 0.9 mm can achieve a relatively wide range of operation when the length-to-diameter ratio of spray cavity is 1 and the outlet contraction angle is 75°.With the increase of working pressure,the maximum value of droplet velocity also increases significantly,but the pressure has little influence on the overall velocity distribution of the atomization flow field.The droplet diameter also increases with the increase of outlet diameter,and the nozzle outlet diameter has a significant impact on the droplet diameter,but the larger the outlet diameter,the smaller the droplet velocity under the same droplet diameter.This result provides a reference for the application of nozzles in the medium and low pressure range.

关 键 词：雾化喷头 雾化特性 液滴粒径 雾化锥角 出口直径 出口收缩角 

分 类 号：S277.9[农业科学—农业水土工程] S491[农业科学—农业工程]