散水式喷头水滴特性试验研究  

Experimental study on water droplets characteristics of water-dispersing nozzle

作　　者：朱兴业[1] 钱兆 刘俊萍[1] 张爱英 魏巧 ZHU Xingye;QIAN Zhao;LIU Junping;ZHANG Aiying;WEI Qiao(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Jiangsu Runguo Agricultural Deve-lopment Co.,Ltd.,Zhenjiang,Jiangsu 212013,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]江苏润果农业发展有限公司,江苏镇江212013

出　　处：《排灌机械工程学报》2024年第1期79-85,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);江苏高校优势学科建设工程(三期)资助项目(PAPD-2018-87)。

摘　　要：为了掌握散水式喷头的水力性能,探究其水滴直径、水滴速度和水滴动能的规律.采用2DVD视频雨滴谱仪对散水式喷头在2种出水口当量直径D e、5种工作压力的工况下进行水力性能试验.结果表明:D e为4.88和5.98 mm的水滴平均直径分别集中分布在0.73~1.38和0.85~1.53 mm内,说明出水口当量直径越小,水滴分布可能更集中,且水滴平均直径随着距喷头距离增大而增大,并呈指数分布.水滴速度随压力和距喷头距离增大而增大,D e为4.88 mm的水滴平均速度大于D e为5.98 mm的.在相同的工作压力下,D e为5.98 mm的喷头其单个水滴动能、单位体积动能和动能强度均大于D e为4.88 mm的.单个水滴动能和水滴平均直径呈指数关系,单位体积动能与距喷头距离呈指数分布,动能强度在距喷头距离0.1~0.6 m内波动幅度较小.In order to understand the hydraulic performance of a sprinkler nozzle,the laws of governing water droplet diameter,velocity and kinetic energy were explored.A 2DVD video disdrometer was used to conduct hydraulic performance experiments with sprinkler nozzles of 2 equivalent diameters D e under 5 working pressures.The results show that the average water droplet diameter of the nozzles with equivalent diameters of 4.88 mm and 5.98 mm are mainly distributed within the ranges of 0.73-1.38 mm and 0.85-1.53 mm,respectively.This indicates that the smaller the equivalent diameter of the nozzle,the more concentrated the droplet distribution of water droplets may be.Furthermore,the ave-rage water droplet diameter increases exponentially with increasing the distance from the nozzle,sho-wing an exponential distribution.Water droplet velocity also increases with increasing pressure and distance from the nozzle,and the average velocity of the nozzles with an equivalent diameter of 4.88 mm is greater than that of nozzles with an equivalent diameter of 5.98 mm.Under the same working pressure,the single droplet kinetic energy,unit volume energy and kinetic energy intensity of a nozzle with an equivalent diameter of 5.98 mm are all greater than those of the nozzles with an equivalent diameter of 4.88 mm.The single droplet kinetic energy is found to be related to the water droplet diameter exponentially,while the kinetic energy per unit volume is related to the distance from the nozzle exponentially.The kinetic energy intensity fluctuates within the range of 0.1-0.6 m from the nozzle with small amplitudes.

关 键 词：散水式喷头 2DVD视频雨滴谱仪 水滴速度 水滴直径 水滴动能 

分 类 号：S277.9[农业科学—农业水土工程]