| 郭永鑫,杨开林,郭新蕾,李甲振,付辉.基于表面粗糙度参数的管道当量粗糙度快速评测[J].水利学报,2018,49(2):178-185 |
| 基于表面粗糙度参数的管道当量粗糙度快速评测 |
| Quick evaluation of the pipeline equivalent sand-grain roughness based on the surface roughness parameters |
| 投稿时间：2017-05-24 |
| DOI：10.13243/j.cnki.slxb.20170498 |
| 中文关键词: 管道 水力摩阻系数 测量不确定度 表面粗糙度参数 当量粗糙度 |
| 英文关键词: pipeline friction factor measurement uncertainty surface roughness parameter equivalent sand-grain roughness |
| 基金项目:国家重点研发计划项目（2016YFC0401808，2016YFC0400603）；国家自然科学基金项目（51609265）；中国水科院科研专项（HY0145B152015，HY0145B802017） |
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| 中文摘要: |
| 管道水力摩阻系数的精确取值是输水工程水力设计的重要前提，当量粗糙度k是计算水力摩阻系数的基础参数，然而传统的水力学试验方法检测k值需耗费较多的人、财、物、时。研究首先对3种不同粗糙度内衬的球墨铸铁管进行水力学性能的试验检测，基于不确定度理论给出合理的k值。在此基础上，采用触针式表面粗糙度仪对管道内壁的表面粗糙度参数进行检测，将检测结果与k值进行比较，结合国外已有试验数据，分析给出工程中管道k值的快速评测方法：当粗糙度轮廓的算术平均偏差Ra ≤ 10 μm或粗糙度轮廓的最大高度Rz ≤ 50 μm时，取样长度为lr=2.5 mm，采用中线制评定所得的Rz≈k，可使用Rz值代表k值对管道的水力性能进行评价。研究成果也可用于生产中管道内涂层加工质量的控制和提高。 |
| 英文摘要: |
| The accurate friction factor of pipeline is an important prerequisite during the hydraulic design process of water conveyance project. The equivalent sand-grain roughness is a key parameter to calculate the pipeline friction factor. However, it takes lots of manpower, material, financial resources and time to measure the equivalent sand-grain roughness by the traditional hydraulic test method. In this study,the hydraulic performances of 3 kinds of ductile iron pipes with different coatings were tested,and the equivalent sand-grain roughness values were obtained based on the measure uncertainty analysis, respectively. Then, the inner wall surface roughness parameters of 3 kinds of pipes were detected by the E-35B portable surface roughness tester profilometer. By the comparison of the surface roughness parameters and the equivalent sand-grain roughness k, and the reanalysis of others researcher's data, a quick evaluation method of pipe equivalent sand-grain roughness based on the surface roughness parameters was given:when the arithmetical mean deviation of roughness profile Ra ≤ 10μm or the maximum height of roughness profile Rz ≤ 50μm, the sampling length of roughness profile lr set to 2.5mm, then Rz≈k. So, the equivalent sand-grain roughness k in the Colebrook-White formula was replaced with Rz, and the friction factor can be calculated. The research results can also be used to control and improve the coating quality of pipeline. |
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