区域供冷系统管路管件局部阻力系数综述
摘要：局部阻力系数是为了简化描述、分析管道管件复杂流体力学现象提出的一个水力学参数，广泛应用于水力管道工程设计分析，其取值的准确性决定了管道水力学工程分析的准确程度。不同文献局部阻力系数取值差别较大，造成实际应用时管件压力损失的计算偏差，以及管道水力学计算的不同结论。本文回顾了几篇典型文献中管件局部阻力系数的取值，包括90°焊接弯头、90°三通、异径管、蝶阀等，其中，大管径90°弯头局部阻力系数接近0.2,90°三通局部阻力系数与分流比和面积比有关，异径管局部阻力系数与几何形状有关，蝶阀局部阻力系数与管径和开度有关。
关键词：局部阻力系数弯头三通异径管蝶阀分流比面积比开度
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[13] 王峻晔，葛晓陵，吴东棣.分支流理论研究进展[J].力学进展，1998,28(3):392- 401.
[2] MILLER D S.Internal flow systems[M].Cranfield:BHRA Fluid Engineering,1978.
[3] British Hydromechanical Research Association.Flow of fluids through valves,fittings,and pipe[M].New York:Crane,1982.
[4] Carrier Air Conditioning Company.Carrier handbook of air conditioning system design[M].New York:McGraw-Hill Book Company,1986:3- 17.
[5] 陆耀庆.实用供热空调设计手册[M].2 版.北京：中国建筑工业出版社，2008.
[6] 电力设计规划总院.火力发电厂汽水管道设计技术规定：DL/T 5054—2016[S] 北京：中国计划出版社，2016.
[7] 贺益英，赵懿，孙淑卿，等.弯管局部阻力系数的试验研究[J].水利学报，2003(11):54- 58.
[8] 王宇石，朱广一，曹慧哲，等.枝状供热管线阻力精细化计算[J].区域供热，2018(5):10- 15,33.
[9] 杨少东，肖瑶，侯京婧，等.大管径90°弯管数值模拟及局部阻力特性研究[J].能源与节能，2020(8):133- 136.
[10] 李涛，李安桂.弯管阻力系数的实验与数值模拟研究[J].山东建筑大学学报，2007,22(2):126- 130.
[11] BAJURA R A,JONES E H.Flow distribution manifolds[J].Transactions ASME journal of fluids engineering,1976,98(4):654- 666.
[12] WANG J.Theory of flow distribution in manifolds[J].Chemical engineering journal,2011,168:1331- 1345.
[13] 王峻晔，葛晓陵，吴东棣.分支流理论研究进展[J].力学进展，1998,28(3):392- 401.
Review of coefficient of local resistance for pipe fittings in district cooling systems
Abstract: The coefficient of local resistance is a hydraulic parameter proposed to simplify the description and analysis of complex hydrodynamic phenomena of pipe fittings, and widely used in the design and analysis of hydraulic pipeline engineering. The accuracy of its value determines the accuracy of pipeline hydraulic engineering analysis. In different references, the value of coefficient of local resistance varies greatly, leading to result deviations of pipe fitting pressure losses in practical application or different conclusions of pipeline hydraulic analysis. This paper reviews the value of coefficient of local resistance of pipe fittings in several typical literatures, including 90° welded elbow, 90° tee, gradual contraction and enlargement and butterfly valve. Among which, the coefficient of local resistance of 90° elbow with large pipe diameter is close to 0.2, while the coefficient of local resistance is dependent on the flow ratio and area ratio for 90° tee, the geometry for gradual contraction and enlargement, and the pipe diameter and opening for butterfly valves, respectively.
Keywords: coefficient of local resistance; elbow; tee; gradual contraction and enlargement; butterfly valve; flow ratio; area ratio; opening;
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