管道接口缩径的局部阻力试验研究  

Experimental study on minor head losses of pipeline joints

作　　者：郭永鑫[1] 郭新蕾[1] 王涛[1] 付辉[1] 潘佳佳 李甲振[1] GUO Yongxin;GUO Xinlei;WANG Tao;FU Hui;PAN Jiajia;LI Jiazhen(China Institute of Water Resources and Hydropower Research,State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,Beijing 100038,China)

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点试验室,北京100038

出　　处：《水利学报》2025年第1期56-62,共7页Journal of Hydraulic Engineering

基　　金：国家重点研发计划项目(2022YFC3202500);国家自然科学基金项目(52179082)。

摘　　要：管道接口缩径会产生明显的局部水头损失,然而一直以来缺乏试验检测资料和评估计算方法。本文建立了管道水头损失检测平台,提出管道接口局部阻力系数的两种检测方法,对聚乙烯管热熔对接卷边和球墨铸铁聚乙烯复合管承插接口保护环的局部阻力系数分别进行检测,分析了接口局部阻力系数的影响因素和变化规律。结果表明:DN150聚乙烯管热熔对接卷边为圆弧边缘,凸起高度δ约4.36 mm,单个接口的局部阻力系数ξ≈0.086,折算当量管长为0.75 m;DN300球墨铸铁聚乙烯复合管承插接口保护环为直角边缘,凸起高度δ约为1.93 mm,单个接口的局部阻力系数ξ≈0.022,折算当量管长为0.51 m;单个接口的局部阻力系数随相对凸起高度δ/D减小而减小。接口为直角边缘的局部阻力系数可采用节流孔板的经验公式计算,圆弧边缘的局部阻力系数可采用钢管焊缝的经验公式计算。研究成果可为管网工程的精细水力计算提供参考。An internal protrusion from a pipeline joint will lower diameter and advance head loss.For the minor head losses of pipeline joints,there is currently a dearth of calculation methods and experimental data.In addition to establishing a pipeline head loss test rig,this paper suggests two test procedures for determining the minor head loss coefficients of pipeline joints.Tests were done on the minor head loss coefficients of a push-on joint of ductile iron polyethylene composite pipes and a butt fusion joint of polyethylene pipes,then the influencing factors and variations of the minor head loss coefficients are analyzed.A butt fusion joint of DN150 polyethylene pipes has a curved edge melt bead and a 4.36 mm internal protrusion height.The minor head loss coefficient ξ of a butt fusion joint is approximately 0.086,indicating that an equivalent length of 0.75 meters would be necessary.A push-on joint of DN300 ductile iron polyethylene composite pipes has a right-angle edge protective ring with an internal protrusion heightδof approximately 1.93 mm.The minor head loss coefficient ξ of a push-on joint is about 0.022,indicating that an equivalent length of 0.51 meters would be required.The minor head loss coefficient of a pipeline joint decreases with decrease of the relative protrusion height δ/D.The empirical formulas of minor head losses of pipeline joints are given for a circular arc edge and a right angle1 edge,respectively.This research results can provide a basis for the precise hydraulic calculation of pipeline network engineering.

关 键 词：管道接口 缩径 水头损失 局部阻力系数 当量管长 

分 类 号：TV134[水利工程—水力学及河流动力学]