摘要
针对长输供热管网摩擦阻力系数目前常用的显式计算式结果不准确而隐式计算式Colebrook-White公式计算不方便的问题,首先根据长输供热管网的运行特点,选取20个Colebrook-White公式的近似计算式,然后在供回水温度为20~130℃、压力为0.5~2.5 MPa、管径为DN1200~DN1600的范围内,分别计算每个近似式计算结果与Colebrook-White公式计算结果的相对误差,进行对比分析并初步确定其中3个误差较小近似式,最后进一步分析管内相对粗糙度对这3个近似式准确度的影响。结果表明,Biberg公式和Serghides公式a的计算稳定性和精度极高,在所计算参数范围,误差均小于0.001%,适合用于长输供热管网的水力计算。以上对比分析,全面考虑了Colebrook-White公式的适用范围和影响因素,解决了长输供热管网摩擦阻力系数方便和准确计算的问题。
For the problem that the explicit calculation formula for the friction resistance coefficient of long-distance heating network is inaccurate and the implicit calculation formula Colebrook-White formula is inconvenient,firstly,according to the operation characteristics of long-distance heating network,20 approximate calculation formulas of Colebrook-White formula were selected,and then when the supply and return water temperature was 20~130℃,the pressure was 0.5~2.5 MPa and pipe diameter was within the range of DN1200~DN1600,the relative errors between the calculation results of each approximate formula and the calculation results of Colebrook-White formula were calculated respectively,compared and analyzed,and three approximate formulas with small errors were preliminarily determined.Finally,the influence of relative roughness in the pipe on the accuracy of these three approximate formulas was further analyzed.The results show that the calculation stability and accuracy of Biberg formula and Serghides formula are very high.Within the range of calculated parameters,the errors are all less than 0.001%,which is suitable for hydraulic calculation of long-distance heating network.The above comparative analysis comprehensively considers the application scope and influencing factors of Colebrook-White formula,and solves the problem of convenient and accurate calculation of friction resistance coefficient of long-distance heating pipe network.
作者
刘雪萌
谢英柏
LIU Xuemeng;XIE Yingbai(Department of Power Engineering,North China Electric Power University,Baoding 071003,China)
出处
《流体机械》
CSCD
北大核心
2022年第1期100-104,共5页
Fluid Machinery
基金
河北省自然科学基金项目(E2019502138)。
