压力及孔径对管道喷雾空心圆锥雾喷头雾滴参数的影响  

Influence of pressure and pore diameter on droplet parameters of hollow cone nozzle in pipeline spray

作　　者：代秋芳[1,2,4] 洪添胜[1,2,3] 宋淑然[1,2,4] 李震[1,2,4] 陈建泽[3] 

机构地区：[1]华南农业大学南方农业机械与装备关键技术教育部重点实验室,广州510642 [2]国家柑橘产业技术体系机械研究室,广州510642 [3]华南农业大学工程学院,广州510642 [4]华南农业大学电子工程学院,广州510642

出　　处：《农业工程学报》2016年第15期97-103,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：广东省自然科学基金(2015A030310398);现代农业产业技术体系建设专项资金(CARS-27);公益性行业(农业)科研专项经费项目(201203016);广东省"扬帆计划"引进创新创业团队专项(201312G06)

摘　　要：雾滴参数是衡量喷雾效果的重要指标。为研究管道喷雾设施中喷雾压力与喷头孔径的改变对果园用空心圆锥雾喷头雾滴参数的影响,通过喷雾性能综合试验平台和激光粒度仪,测量3种孔径的空心圆锥雾喷头在8种压力下的雾滴颗粒群的散射谱,获得了雾滴参数随压力和孔径的变化规律,给出了各工况下的雾滴谱曲线,分析了雾滴粒径的大小、分布和均匀性,建立了基于压力和孔径的雾滴参数模型。结果表明:压力越大,孔径越小,雾滴越细小越均匀;数据拟合误差均小于0.012;雾滴均较细小且较均匀,主要以气溶胶的形式存在;主要是粒径小于40μm的雾滴(79.659%~93.374%);雾滴谱峰值均在30μm附近出现;压力大于0.80 MPa后喷雾效果更好,其中体积中值粒径(volume median diameter,VMD)为30.610~31.632μm,雾滴很细小,扩散比(diffusion ratio,DR)为0.901~0.916,雾滴很均匀,VMD和DR均随压力呈二次多项式变化规律(R^2均大于0.968),VMD和DR与孔径和压力均有良好的二元线性关系(R^2分别为0.928和0.937)。研究结果验证了研发管道恒压喷雾装置的重要性,为喷头选型,管道恒压喷雾装置的优化、喷雾压力的设定和喷雾效果的优化提供了参考。Mountainous orchards are the majority type of orchards in southern China.This type of orchards usually adapts low plant height and high-density cultivation mode,which makes it difficult for mobile spray machines to get into the orchards.Lever-operated knapsack sprayers and stretcher mounted sprayer with long flexible pipe are still in use by many orchardists to finish the spray work which makes the task laborious and inefficient.Pipeline spraying technology with no need for moving fulfills the management request of mountainous orchards,and also,it has the characteristics of saving time and vigor.Droplet parameters and droplet spectrum can reflect the droplets size,distribution and uniformity,and meanwhile are the key measures of spray effect.Spray pressure and nozzle pore diameter are the main factors affecting droplet parameters pipeline constant pressure spray facilities.In order to access the influence of spray pressure and nozzle pore diameter on droplet parameters of hollow cone nozzle for pipeline constant pressure spray facilities in orchards,we studied five important aspects of spray performance combined with test platform and laser particle analyzer through measuring droplets scattering spectra of hollow cone nozzle at three types of pore diameter and eight levels of pressure.From such study,we wanted to determine variations of droplet parameters with different pressure and nozzle pore diameter,draw droplet spectrum curves of various working conditions,analyze droplets diameter,distribution and uniformity,and build droplet parameters models based on pressure and nozzle pore diameter.The results showed that the higher the pressure was,and the smaller the pore diameter of the nozzle was,the tinier and the more uniform the droplets would be.Second,at pressure of 0.70-1.40 MPa,data fitting error of three types of nozzles were less than 0.012,which fulfilled the request of experiment.There were not droplets with diameter more than 200 μm.Droplets with diameter 100-200 μm could be ignored because the percent

关 键 词：喷雾 模型 喷头 喷雾压力 喷头孔径 雾滴参数 雾滴谱 

分 类 号：S49[农业科学—植物保护]