| 引用本文: | 戴啸扬,张莹秋,郑俊,尚岳全.细管径虹吸流速计算参数分析与修正计算方法[J].哈尔滨工业大学学报,2023,55(2):62.DOI:10.11918/202108028 |
| DAI Xiaoyang,ZHANG Yingqiu,ZHENG Jun,SHANG Yuequan.Parameter analysis and modified calculation method of siphon velocity calculation for pipe with small diameter[J].Journal of Harbin Institute of Technology,2023,55(2):62.DOI:10.11918/202108028 |
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| 摘要: |
| 高扬程边坡虹吸排水会释放大量气泡,为防止虹吸过程产生空气积累破坏虹吸排水的长效性,需要采用d≤5 mm管径形成段塞流。由于管径小且有气液二相流,已有虹吸流速计算可能出现较大误差,影响虹吸排水系统设计的合理性。针对细管径虹吸流速计算误差大的问题,通过分析虹吸流动过程特征来确定流速计算参数,将巴尔公式引入沿程水头损失计算中,并开展足尺物理模型试验。确定适用于虹吸流速迭代运算的沿程水头损失系数计算公式,提出利用断面平均水头损失反映边界层作用影响的圆管层流流速计算方法,在巴尔公式中引入折减系数降低临界雷诺数区的流速计算误差。物理模型试验的测试结果表明,提出的修正计算方法提高了虹吸流速的计算精度,可为工程应用提供参考。 |
| 关键词: 滑坡 虹吸排水 虹吸流速计算 边界层 误差修正 |
| DOI：10.11918/202108028 |
| 分类号:TU42 |
| 文献标识码:A |
| 基金项目:国家重点研发计划(2018YFC1504704)；国家自然科学基金(41772276) |
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| Parameter analysis and modified calculation method of siphon velocity calculation for pipe with small diameter |
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DAI Xiaoyang,ZHANG Yingqiu,ZHENG Jun,SHANG Yuequan
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(College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China)
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| Abstract: |
| High-lift siphon drainage can release a large number of bubbles. The pipe diameter d≤5 mm should be adopted to form slug flow, so as to prevent the accumulation of air in the siphon process from damaging the long-term performance of siphon drainage. Due to the small pipe diameter and gas-liquid two-phase flow, the existing siphon velocity calculation may have large errors, which affect the rationality of siphon drainage system design. In view of the problem of large error in velocity calculation of small-diameter siphon, the velocity calculation parameters were determined by analyzing the characteristics of siphon flow process. The Barr formula was introduced into the calculation of friction head loss, and full-scale physical model test was carried out. The formula of head loss coefficient suitable for the iterative calculation of siphon velocity was determined, and the calculation method of laminar flow velocity in circular pipe was proposed by using the average head loss of cross-section to reflect the influence of boundary layer. The reduction coefficient was introduced into the Barr formula to reduce the calculation error of velocity in the critical Reynolds number region. Test results of the physical model show that the modified calculation method improved the calculation accuracy of siphon velocity, which can provide reference for engineering application. |
| Key words: landslide siphon drainage siphon velocity calculation boundary layer error correction |
