| 郭永鑫,郭新蕾,杨鹏志,付辉,王涛.管道水力摩阻系数的敏感性分析[J].水利学报,2019,50(8):1021-1028 |
| 管道水力摩阻系数的敏感性分析 |
| Sensitivity analysis of the hydraulic conveyance coefficients of pipes |
| 投稿时间：2018-12-10 |
| DOI：10.13243/j.cnki.slxb.20181090 |
| 中文关键词: 输水管道 水力摩阻系数 水头损失 敏感性分析 |
| 英文关键词: water conveyance pipeline hydraulic conveyance coefficient head loss sensitivity analysis |
| 基金项目:国家重点研发计划课题（2016YFC0400605）；国家自然科学基金项目（51679262）；中国水科院科研专项（HY0145B802017）；流域水循环模拟与调控国家重点实验室课题（SKL2018TS07） |
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| 中文摘要: |
| 管道水力摩阻系数的合理取值是输水工程经济、高效运行的关键，尤其是当前广泛采用的大口径输水管道。然而受内壁粗糙度、管径D、流速V、水温T等诸多因素的影响，水力摩阻系数取值存在较大的不确定性。本文对常用摩阻系数进行了系统的敏感性分析，研究表明：同种管材的海森-威廉系数Ch和曼宁糙率系数n均随管径D增大而增大，并且曼宁糙率n的相对增幅远大于海森-威廉系数Ch，当前设计中忽略管径D对曼宁糙率n的影响是造成部分工程水头损失计算误差较大的原因之一。海森-威廉公式对不同管径的适应性优于谢才-曼宁公式，工程设计如采用谢才-曼宁公式，需考虑管径和流速对曼宁糙率n的影响。上述成果可为管道输水工程的设计、运行和管理提供参考。 |
| 英文摘要: |
| Accurate values of the hydraulic conveyance coefficients are essential to the economical and effi-cient operation of water conveyance pipelines,especially large diameter pipes. The hydraulic conveyance co-efficients,i.e. Darcy fiction factor λ,Hazen-Williams roughness coefficient Ch and Manning's roughness co-efficient n, are dependent on many factors, including the equivalent roughness height k, the pipe diameter D,the average velocity V and the water temperature T. In this paper,the uncertainty of the conveyance co-efficients was studied by a systematic sensitivity analysis method. The results indicated that Hazen-Williams roughness coefficient Ch and Manning's roughness coefficient n both increase with the increase of pipe diam-eter D, and the relative increase of the n value is larger than that of the Ch value for the same kind of pipe material. That is to say, the Hazen-Williams formula is more suitable for different diameter pipes than Manning formula. During the hydraulic design process of water conveyance pipelines, the effects of the velocity and diameter on Manning's coefficient n must be considered, otherwise the head loss error will be considerable. The research results are helpful to improve the prediction accuracy of head loss in pipes, and provide useful information for the design, operation and management of water conveyance pipe-lines. |
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