长江科学院院报 ›› 2023, Vol. 40 ›› Issue (8): 92-96.DOI: 10.11988/ckyyb.20220224

• 水力学 • 上一篇    下一篇

肯尼亚某迷宫堰溢洪道水力特性

闫彭彭   

  1. 上海市政工程设计研究总院(集团)有限公司 合肥分公司,合肥 230061
  • 修回日期:2022-05-19 出版日期:2023-08-01 发布日期:2023-08-09
  • 作者简介:闫彭彭(1992-),男,安徽阜阳人,工程师,硕士,主要从事水工结构设计工作。E-mail:yanpengpeng@smedi.com

Hydraulic Characteristics of Spillway of a Labyrinth Weir in Kenya

YAN Peng-peng   

  1. Hefei Branch of Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Hefei 230061, China
  • Revised:2022-05-19 Published:2023-08-01 Online:2023-08-09

摘要: 受泄洪要求、地质条件、用地规模、供电水平、运行管理等条件约束,肯尼亚某大坝供水项目溢洪道控制段设计拟由有闸控制的宽顶堰方案调整为无人值守的迷宫堰方案。为确保泄洪能力满足原设计要求,尽可能减少工程投资,并降低溢洪道方案的修改对大坝工程的影响,按现有工程经验初拟迷宫堰设计堰高、堰宽、展长等参数,采用Flow-3D软件模拟分析溢洪道泄流工况,根据数值模拟结果最终确定设计参数后,进行模型试验加以验证。数值模拟成果及模型试验结果表明:在堰上水头小于堰高时,迷宫堰综合流量系数随堰上水头的增加呈现先增后减的趋势;迷宫堰溢洪道泄流时无明显不良流态,且具有很高的过流能力,满足特殊要求下工程应用要求。

关键词: 迷宫堰溢洪道, 数值模拟, 模型试验, 流量系数, 肯尼亚

Abstract: This study proposes an adjustment to the design of spillway control section of a water supply dam project in Kenya which is constrained by flood discharge requirements, geological conditions, land use scale, power supply capacity, and dam operation and control. The proposed design scheme changes from a gated wide-crested weir to a labyrinth weir to ensure the flood discharge capacity meets the original design requirements and reduce project costs while minimizing impacts on the dam works. Design parameters such as the height, width, and extended length of labyrinth weir are preliminarily proposed based on engineering experience. Flow-3D software is used to simulate and analyze the spillway discharge conditions, and physical model tests are conducted to verify the design parameters determined from the numerical simulation results. The numerical simulation and physical model test demonstrate that when the water head above the weir is less than the weir height, the comprehensive flow coefficient of the labyrinth weir initially increases and then decreases with increasing water head above the weir. Moreover, no distinct unfavorable flow regime was observed during labyrinth weir discharge, reflecting sound discharge capacity that meets the special requirements of the engineering application.

Key words: spillway of labyrinth weir, numerical simulation, model test, flow coefficient, Kenya

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