全射流喷头水滴分布试验及模型  

Drop size distribution experiments of gas-liquid two phases fluidic sprinkler

作　　者：刘俊萍[1] 刘伟忠 鲍亚[1] 张前[1] 刘兴发[1] 

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]镇江市农业科学技术实业公司,江苏镇江212400

出　　处：《排灌机械工程学报》2017年第8期731-736,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：江苏省青蓝工程优秀青年骨干教师项目;国家星火计划项目(2015GA690006);镇江市科技合作计划-国际科技合作项目(GJ2014012)

摘　　要：为了探索全射流喷头喷洒水滴直径分布规律,采用激光雨滴谱仪测量技术对喷头的喷洒水滴速度及直径等参数进行测量,并采用个数加权法对水滴分布进行统计分析,总结全射流喷头距喷头不同距离及150~350 k Pa压力工况下的水滴频率分布及水滴累计频率分布的变化规律.研究结果表明:距离喷头越近,喷头喷洒的水滴直径越小,且小直径低速度水滴数量越多,水滴累计频率曲线斜率越大.压力增大时,距喷头不同距离的水滴累计频率曲线斜率逐渐减小,说明水滴直径沿径向大小分布较为均匀.在距喷头不同的距离下,水滴频率呈对数正态分布趋势.将水滴累计频率分布分别采用玻尔兹曼函数与指数函数分布进行对比,2种函数拟合精度均较高,可为全射流喷头喷灌质量的预测提供理论依据.In order to explore the drop size distribution law of the complete fluidic sprinkler,laser measurement technology raindrop spectrometer（ LPM） was used to measure the spray raindrop speed,drop size diameter and drop size distribution. Statistical analysis was conducted on the drop size distribution by the number weighted method,and the variation law of drop size frequency and cumulative frequency distribution under the pressure from 150 k Pa to 350 k Pa at different distance from the sprinkler were summed. The results show that the closer the distance from the sprinkler,the smaller the diameter of drop size,and the more the number of low speed,and the greater the droplet cumulative frequency curve slope. When the pressure increased,the cumulative frequency curve slope of droplets at different distance from the sprinkler decreased,indicating that the droplet diameter distributed radially was even. At the different distance from the sprinkler,the frequency distribution of droplet diameter presented the trend of log normal distribution. Boltzmann function distribution and exponential function distribution were compared for the drop size cumulative frequency. The fitting accuracy of the two func-tions was high. The results filled the model system of the spray single-phase water droplet distribution,and can provide a theoretical basis for predicting sprinkler irrigation quality of complete fluidic sprinkler.

关 键 词：全射流喷头 个数加权法 水滴直径 水滴分布 

分 类 号：S277.9[农业科学—农业水土工程]