山地灌区重力流下管道极限流速探讨  

Investigation for the Pipeline Limit Flow Rates of Gravity Flow Conditions in Mountain Irrigation Area

作　　者：李斌[1] 王以兵[1] 丁林[1] 

机构地区：[1]甘肃省水利科学研究院,甘肃兰州730000

出　　处：《人民黄河》2013年第2期81-82,共2页Yellow River

基　　金："十二五"国家科技支撑计划项目(2011BAD29B04);水利部公益性行业科研专项(201101045);甘肃省科技支撑计划项目(1011NKCA061);甘肃省技术研究与开发计划项目(1105TCYA007)

摘　　要：在民勤县红崖山水库对管径为110、75 mm的PVC管进行了过水时间、过水流量、管道首部供水水头、管道沿程动水压力等项目的测试,探讨了不同坡度下两种管道的最大流速。结果表明:120 m内重力输水条件下管道极限流速为3.80～4.88 m/s,远远大于以往设计中所采用的经济流速1.50 m/s,因此4 m/s的流速可作为山地灌溉管材选择的流速标准。Through the test on water time, water flow, water supply head pipe pressure, the hydrodynamic pressure along the pipeline in PVC pipe with pipe diameter of 110 and 75mm at Hongyashau Reservoir in Minqin County, the maximum velocities of the different slopes of two pipelines were explored. The results show that limit velocity is 3.80 -4.88 m/s in the 120m pipeline under gravity flow conditions, which is much larger than that of the economic velocity of 1.50 m/s for conventional design. Thus the flow rate of 4 m/s can be used as a selected flow rate of mountain irrigation pipe standards.

关 键 词：山地灌区 重力流 管道极限流速 

分 类 号：S275[农业科学—农业水土工程]