扇形雾喷头雾滴飘失机理  

Drift Mechanism of Flat Fan Nozzle

作　　者：宋坚利[1] 刘亚佳[1] 张京[1] 何雄奎[1] 曾爱军[1] Herbst A 

机构地区：[1]中国农业大学理学院,北京100193 [2]德国联邦耕作物研究中心

出　　处：《农业机械学报》2011年第6期63-69,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家高技术研究发展计划(863计划)资助项目(2008AA100904);国家自然科学基金资助项目(30800728;30971940)

摘　　要：为了分析雾滴飘失机理和提出针对性的防飘措施,使用相位多普勒粒子分析仪(PDPA)对常规扇形雾喷头雾化产生的喷雾扇面中的雾滴粒径与运动速度分布进行了分析。结果表明:喷雾截面上雾滴体积中值直径(VMD)分布为中间低、边缘高的凹面形态,在喷雾扇面横向和纵向对称面上,VMD形态呈二次多项式分布;易飘失雾滴主要集中在距离喷头300～500 mm喷雾扇面的中心位置;喷雾扇面截面上的夹带气流速度符合高斯分布,气流分布与空气淹没射流类似;喷雾扇面中易飘失区域是喷雾扇面末端、喷雾扇面两翼、喷雾扇面迎流面外层。In order to research the drift mechanism and develop effective anti-drift technology,phase Doppler particle analyzer（PDPA） was used to analyze droplets size and velocity distribution in spraying fan near flat fan nozzles.Results showed that the distribution of droplets size（VMD） in spraying fan sectional view was like a concave,and droplets size varied following quadratic polynomial in cross-symmetry plane and lengthwise-symmetry plane of spraying fan.Droplets drifting easily were located in the 300～500mm of the centre of spraying fan far from nozzles.Entrained air velocity in spraying fan varied following Gauss distribution,and the flow field of entrained air was similar to a submerged air jet.Major drifting areas were evaluated depending on the droplets size and velocity distribution in spraying fan.Results showed that there were three major drifting areas in spraying fan： cross edges of spraying fan,wake region of spraying fan and outer layer facing wind of spraying fan.

关 键 词：扇形雾喷头 喷雾 雾滴 飘失 机理 

分 类 号：S491[农业科学—植物保护]