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全射流喷头喷洒水滴动能分布规律
引用本文:朱兴业,刘兴发,刘俊萍,袁寿其,鲍 亚.全射流喷头喷洒水滴动能分布规律[J].农业工程学报,2015,31(15):26-31.
作者姓名:朱兴业  刘兴发  刘俊萍  袁寿其  鲍 亚
作者单位:1. 江苏大学流体机械工程技术研究中心,镇江 212013; 2.华盛顿州立大学农业灌溉研究发展中心,美国普罗瑟 99350;,1. 江苏大学流体机械工程技术研究中心,镇江 212013;,1. 江苏大学流体机械工程技术研究中心,镇江 212013;,1. 江苏大学流体机械工程技术研究中心,镇江 212013;,1. 江苏大学流体机械工程技术研究中心,镇江 212013;
基金项目:国家高技术研究发展计划(863)项目(2011AA100506);国家自然科学基金(51309117);中国博士后科学基金特别资助(2014T70484)。
摘    要:喷灌动能是评价喷头水力性能优劣的重要指标之一。该文在0.15、0.20、0.25、0.30和0.35 MPa工作压力下,采用激光雨滴谱仪测量技术(laser precipitation monitor,LPM)对全射流喷头的水滴直径、速度和水量分布等参数进行试验,研究了单个水滴动能、单位体积水滴动能、动能强度分布规律及动能强度均匀性系数与组合间距之间的关系。结果表明:全射流喷头的单个水滴动能分布与水滴直径之间的关系与该文所建立的模型拟合较好,呈幂函数关系;单位体积水滴动能沿径向呈一次函数关系增大,与压力的?0.556次方呈正比关系;动能强度沿径向逐渐增大,而在射程末端迅速减小至0,随压力增大而减小,且沿径向距离的增大而动能强度减小程度越大;在各工作压力下,全射流喷头的矩形最佳组合间距分别为1.2、1.0、1.1、1.0、1.1倍喷头射程;所对应的动能强度均匀性系数分别为56.6%、71.1%、76.2%、77.2%、72.9%。该结果对研究喷头外特性、优化喷头结构、喷灌系统优化配置提供了一定的理论价值。

关 键 词:喷灌系统  动能  喷洒  水滴  全射流喷头  动能强度  动能强度分布均匀性系数
收稿时间:3/3/2015 12:00:00 AM
修稿时间:2015/7/17 0:00:00

Droplet kinetic energy distribution regulation of complete fluidic sprinkler
Zhu Xingye,Liu Xingf,Liu Junping,Yuan Shouqi and Bao Ya.Droplet kinetic energy distribution regulation of complete fluidic sprinkler[J].Transactions of the Chinese Society of Agricultural Engineering,2015,31(15):26-31.
Authors:Zhu Xingye  Liu Xingf  Liu Junping  Yuan Shouqi and Bao Ya
Institution:1. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China; 2. Irrigated Agriculture Research and Extension Center, Washington State University, Prosser 99350, USA;,1. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China;,1. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China;,1. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China; and 1. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China;
Abstract:Abstract: The kinetic energy of sprinkler spraying is an important factor to evaluate sprinkler hydraulic performance, and has a great significance to study soil and water conservation. The kinetic energy of sprinkler spraying mainly includes the droplet kinetic energy, the kinetic energy per unit volume, the kinetic energy intensity and the uniformity coefficient of kinetic energy intensity. All of them are closely related to the hydraulic parameters of sprinkler. The hydraulic parameters contain the water distribution, the droplet diameter and the droplet velocity. To study the kinetic energy distribution of PXH, PXH10 sprinkler hydraulic parameters were tested under the no wind condition, with the operating pressure of 0.15, 0.20, 0.25, 0.30 and 0.35 MPa, respectively. The single sprinkler water distribution was measured by catch cans. The catch cans were placed on the testing stand with a spacing of 2 m × 2 m. The laser precipitation monitor (LPM) was used to measure the droplet diameter and velocity. The results showed that the kinetic energy of sprinkler spraying distribution of PXH was different from the other types of sprinklers. The droplet kinetic energy increased with the increase of the droplet diameter. The relationship between droplet kinetic energy and droplet diameter of PXH was indicated by the power function model. The correlation coefficients for the model were up to 0.9 in different pressures. It increased by an average of 20% compared with the other models which were used to show the droplet kinetic energy distribution of PXH. Under different pressures, both the droplet kinetic energy and the kinetic energy per unit volume reached a maximum at the end of the spraying wetted radius. When the pressure increased, the maximum of the kinetic energy per unit volume decreased. The kinetic energy per unit volume increased linearly with the distance from the sprinkler increasing. There were proportional relationships between kinetic energy per unit volume and operating pressures. The proportional function model, which was more appropriate than the exponential function model, could be used to express the distribution of the kinetic energy per unit volume for PXH. The kinetic energy intensity was greatly affected by the water distribution and the kinetic energy per unit volume. The kinetic energy intensity decreased with the operating pressure increasing at the same location. Under the pressure of 0.15, 0.20, 0.25, 0.30 and 0.35 MPa, the maximum kinetic energy intensity of PXH emerged at the distance of 8, 6, 7, 7 and 8 m, respectively. However, there was little difference between these maximum kinetic energy intensity values. Moreover, the kinetic energy intensity gradually increased with the distance from the sprinkler and rapidly decreased at the end of the sprinkler wetted radius. Under different pressures, uniformity coefficients of kinetic energy intensity about the rectangle combination spacing of PXH were simulated by MATLAB. The rectangle combination spacings were 1.0, 1.1, 1.2, 1.3, 1.4 times of the spraying wetted radius of PXH. The simulated results showed that under the operating pressure of 0.15, 0.20, 0.25, 0.30 and 0.35 MPa, the optimum combination spacings were 1.2, 1.0, 1.1, 1.0 and 1.1 times of the spraying wetted radius, respectively, and the uniformity coefficients of kinetic energy intensity were 56.6%, 71.1%, 76.2%, 77.2% and 72.9%, respectively. The results provide certain academic value for studying the sprinkler external spraying characteristics, and optimizing the sprinkler structure and irrigation system.
Keywords:sprinkler system  kinetic energy  spraying  droplet  kinetic energy intensity  uniformity coefficient of kinetic energy intensity
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