压力对低压喷头水量分布模型影响的试验研究  

Experimental study on effects of pressure on water distribution model of low-pressure sprinkler

作　　者：鲍亚[1] 刘俊萍[1] 刘兴发[1] 田坤[1] 张前[1] 

机构地区：[1]江苏大学国家水泵及系统工程研究中心,江苏镇江212013

出　　处：《排灌机械工程学报》2016年第1期81-85,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51309117);国家863计划项目(2011AA100506);中国博士后科学基金特别资助项目(2014T70484);江苏高校优势学科建设工程资助项目

摘　　要：为研究喷头压力对水量分布模型的影响,以低压喷头为例,对其进行水力性能试验.通过计算矩形组合下不同压力的喷灌组合均匀系数Cu和组合分布均匀系数Du,探索喷头压力对水量分布模型的影响.结果表明：对于低压喷头,喷灌强度随压力增大先逐渐增大,达到一定值后基本保持不变.在距喷头不同距离时,不同压力下的喷灌强度变化情况不同.在低压范围内,压力对喷灌组合均匀系数和组合分布均匀系数的影响较明显.在100~200 k Pa范围下,Cu和Du均随着压力的增大而增大.在200~300 k Pa范围下,Cu与Du均变化不大.最终提出二者的函数关系式,为多因素下水量分布模型的建立提供理论依据.In order to study effects of pressure on water distribution model of low-pressure sprinkler,a series of hydraulic performance experiments are carried out. The effects of pressure on the water distribution model are explored by calculating sprinkler irrigation combination uniformity coefficient（ Cu）and combination distribution uniformity（ Du） under the combined rectangular conditions at different pressures. The results show that sprinkler intensity increases steadily with the increasing pressure until it reaches a certain high constant value. The change in sprinkler irrigation intensity is dependent on the distance from the sprinkler. Cuand Duare important indicators for evaluating the sprinkler hydraulic performance in a low-pressure range. The effects of pressure on Cuand Duare obvious. In the range of100- 200 k Pa,Cuand Duincrease with the increasing pressure. In the range of 200- 300 k Pa,Cu and Duchange a little. Finally,a relationship between Cuand Duis put forward. This study provides a basis for establishing a water distribution model for multiple factors.

关 键 词：喷头 喷灌组合均匀系数 喷灌强度 组合分布均匀系数 压力 

分 类 号：S277.9[农业科学—农业水土工程]