| 隧洞明满流边界下滇中引水工程闸门过流特性 |
| |
| 引用本文： | 管光华,殷心盼,陈刚,顾世祥.隧洞明满流边界下滇中引水工程闸门过流特性[J].农业工程学报,2022,38(7):91-99. |
| |
| 作者姓名： | 管光华 殷心盼 陈刚 顾世祥 |
| |
| 作者单位： | 1. 武汉大学水资源与水电工程科学国家重点实验室，武汉 430072;;2. 云南省水利水电勘测设计研究院，昆明 650021; |
| |
| 基金项目： | 国家自然科学基金项目（51979202） |
| |
| 摘 要： | 传统的水闸流量关系是在上游明流条件下试验得到的，但关于上游明流向有压流过渡的非恒定流状态时，流量关系的规律及计算方法缺乏探索，而这一规律对于中国在建的大量长距离输水隧洞出口闸门的调控十分关键。该研究通过三维数值模拟，建立实际的渠隧系统三维流体力学模型，探究明满流上游边界下闸门过流特性，并尝试探索在非恒定流工况下适配的过闸流量计算数学模型。结果表明：1）事故调度闸门突然关闭时，上游隧洞内出现无压-有压过渡流态，最大压力水头约为33 m，该研究提出一种改进的无量纲公式计算流量，即在闸前总水头中考虑上游隧洞内压力水头；2）无量纲公式相较于传统公式平均率定误差降低4个百分点，提出的无压-有压流态流量计算统一率定模型最大相对误差为4.68%，精度较高。该研究所提出的流量计算方法对长距离渠隧系统调度具有参考价值，也可为实际工程的管理提供可靠技术支撑，对于工程的安全稳定运行及灌区的正常输配水具有重要意义。
|
| 关 键 词： | 数值模拟 仿真 压力 明满流 闸门 FLOW-3D 滇中引水工程 |
| 收稿时间： | 2021/12/27 0:00:00 |
| 修稿时间： | 2022/3/23 0:00:00 |
Gate flow characteristics under free-surface-pressurized boundary for a water diversion project in central Yunnan of China |
| |
| Guan Guanghu,Yin Xinpan,Chen Gang,Gu Shixiang.Gate flow characteristics under free-surface-pressurized boundary for a water diversion project in central Yunnan of China[J].Transactions of the Chinese Society of Agricultural Engineering,2022,38(7):91-99. |
| |
| Authors: | Guan Guanghu Yin Xinpan Chen Gang Gu Shixiang |
| |
| Affiliation: | 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;;2. Yunnan Institute of Water Resources and Hydropower Survey and Design, Kunming 650021, China; |
| |
| Abstract: | Water shortage has been much more serious in recent years in China, particularly with the need for national economic development. The long-distance water transfer and distribution projects have been constructed to increase the layout of the open channel behind the water transmission tunnels. Among them, the sluice gate has been one of the most important components for the water level and flow control structure in the water transfer projects. The precise control function is closely related to the water level-flow relationship during operation. In addition to the adjustment function, the sluice gate can also be implemented for the emergency closure of some canal sections under accident conditions. The traditional sluice flow relationship is experimentally obtained under the condition of upstream open flow. However, only a few studies were focused on the calculation of the flow relationship when the upstream free flow transitions to the unsteady flow state of the pressure flow. It is high demand for the precise regulation of the exit gates in a large number of long-distance water conveyance tunnels under construction. Otherwise, the water diversion project cannot safely and stably provide the demanded water to the irrigation areas and water-consuming units. Starting from the actual design parameters of the Water Transfer Project in the Central Yunnan Province of China, this study aims to establish a three-dimensional fluid mechanics model for the actual canal-tunnel system using numerical simulation, in order to explore the water open and full flow characteristics under the upstream boundary of the gate. A mathematical model of over-gate flow was also calculated suitable for the non-constant flow conditions. The simulation was verified from one- and three-dimensional perspectives. The simulation results show that the transition process basically conformed to the laws of hydraulics. The results show that: 1) There was a free-surface-pressurized flow upstream of the gate during the unsteady flow process in the sudden closure of the accident dispatch gate. The flow velocity of the open channel section behind the gate increased significantly during the transition, which was about twice the maximum flow velocity under the design flow condition. The pressure head appeared before the gate, where the maximum was about 33 m. 2) Once the average calibration error of the dimensionless formula reduced by 4 percentage points than before, there was a pressurized flow state in the upstream tunnel. The improved dimensionless formula was used to calculate the flow rate, while, the pressure head in the upstream tunnel of the gate was used to replace the upstream water level. 3) The maximum relative error of the unified calibration mode was 4.68%, indicating the acceptable accuracy range. Therefore, the improved formula presented a simple form to require the fewer calibration parameters. The calculation can provide a strong reference to set the inner boundary of the gate for the long-distance canal-tunnel system scheduling. The finding can also offer reliable technical and practical support for the safe and stable operation of the water transmission and distribution project. |
| |
| Keywords: | numerical simulation simulation pressure free-surface-pressurized flow gate FLOW-3D central Yunnan water diversion project |
|
| 点击此处可从《农业工程学报》浏览原始摘要信息 |
|
点击此处可从《农业工程学报》下载全文 |
|
