水利学报2025，Vol.56Issue(1)：56-62,7.DOI:10.13243/j.cnki.slxb.20240195
管道接口缩径的局部阻力试验研究
Experimental study on minor head losses of pipeline joints
摘要
Abstract
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 var-iations 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 pro-trusion height δ of approximately 1.93 mm.The minor head loss coefficient ξ of a push-on joint is about 0.022,in-dicating 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 angle 1 edge,respectively.This research results can pro-vide 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Key words
pipeline joint/reduced diameter/head loss/minor loss coefficient/equivalent length分类
建筑与水利引用本文复制引用
郭永鑫,郭新蕾,王涛,付辉,潘佳佳,李甲振..管道接口缩径的局部阻力试验研究[J].水利学报,2025,56(1):56-62,7.基金项目
国家重点研发计划项目(2022YFC3202500) （2022YFC3202500）
国家自然科学基金项目(52179082) （52179082）
