滴灌毛管局部水头损失计算方法研究  

Study on Calculation Method of Lateral local Head loss with Insertion Emitter

作　　者：王剑[1] 朱德兰[2] 李岚斌[1] 仇振杰[2] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《节水灌溉》2011年第12期16-18,22,共4页Water Saving Irrigation

基　　金："863"计划(2010AA10A302);农业科技创新专项(CX200909)

摘　　要：为了探明安装插入式灌水器的毛管局部水头损失计算方法及其在沿程水头损失中所占的比例,从水力学基本原理出发,分析了毛管局部水头损失与其影响因素之间的关系,推导出毛管局部水头损失及占沿程水头损失比例的计算公式,并进行了讨论分析。结果表明:毛管局部水头损失随着毛管内径的增大而减小,随着灌水器插头断面面积、灌水器流量和灌水器个数的增大而增大。毛管局部水头损失占沿程水头损失比例是由灌水器个数、流量、间距、插头断面面积以及毛管内径共同决定的,在不同参数情况下,其值由0.02到1.10不等,在某些情况下,局部水头损失甚至大于沿程水头损失,由此说明,毛管局部水头损失计算方法的研究对提高滴灌毛管设计精度具有重要意义。In order to explore the calculation method for the lateral local head loss of insertion emitter and the proportion of the local head loss to frictional loss, based on the hydraulic principle, the relationship between local head loss and its effecting factors is analyzed and the calculation formula for the proportion of the local head loss to frictional loss is deduced. The study results show that the local head loss decreases with the increase of lateral diameter, while increases with the increase of the inserting area, the flow rale and the number of the emitter. The proportion of lateral local head loss to frictional loss changes from 0. 02 to 1. 10, which is determined by the number, the flow rate, the inserting area, the space between of the emitter and the lateral diameter. Therefore, the calculation of the lateral local loss can improve the precision of lateral design.

关 键 词：滴灌毛管 沿程水头损失 局部水头损失 

分 类 号：S275.6[农业科学—农业水土工程]