双洞双弯长陡坡导流隧洞明满交替流水力特性研究  

Hydraulic Characteristics of Mixed Free-Surface-Pressure Flow in the Long Steep Slope Diversion Tunnel with Double Tunnels and Double Bends

作　　者：何永胜 任坤杰[2,4] 严伟 蒲宁 李学海[2,4] HE Yongsheng;REN Kunjie;YAN Wei;PU Ning;LI Xuehai(Huadian Tibet Energy Co.,Ltd.,Lhasa,Xizang 851400,China;Yangtze Academy of Sciences,Wuhan,Hubei 430010,China;East China Survey and Design Research Institute Co.,Ltd.,Hangzhou,Zhejiang 311122,China;Key Laboratory of River and Lake Regulation and Flood Control in the Middle and Lower Reaches of the Yangtze River of Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan,Hubei 430010,China)

机构地区：[1]华电西藏能源有限公司,西藏拉萨851400 [2]长江科学院,湖北武汉430010 [3]华东勘测设计研究院有限公司,浙江杭州311122 [4]水利部长江中下游河湖治理与防洪重点实验室,湖北武汉430010

出　　处：《水利与建筑工程学报》2024年第1期62-68,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金面上项目“陡坡隧洞明满交替流水力特性研究”(51279014);中央级科研院所基本业务费项目“引调水工程渠道输水能力提升降糙材料与关键技术研究”(CKSF2023317+SL)。

摘　　要：双洞双弯长陡坡导流隧洞内,由于弯道螺旋流的影响,引起明满交替流流量区间增大,加之明满交替流的水力特性为非恒定流,导致洞内明满交替流的界定与导流设计流量的确定难度大幅增加。针对此问题,基于三维数学模型模拟,阐述洞内流态由明流经明满交替流转变为有压流的过程;提出携气有压流归为有压流范畴且作为明满交替流与有压流的分界流态;明确明满交替流的水力特征:上游相对作用水头为1.61~2.40;流态为自由面不连续且随时空变化;同一流量下库水位波动较大,内侧隧洞分流比随之呈正向变化,而外侧隧洞分流比则呈反向变化;沿程压力特性呈现有压流特性与明流特性交替变化,作用压力紊动性强。In the long steep slope diversion tunnel with double tunnels and double bends,the spiral flow in the upper and lower bends could increase the flow range of mixed freesurfacepressure flow and the unsteady influence of the hydraulic characteristics lead to increasing the difficulty of defining mixed freesurfacepressure flow and determining the diversion design flow.Based on the simulation of a threedimension mathematical model,the process of changing the flow pattern in the tunnel from free surface flow to mixed freesurfacepressure flow,and then to pressure flow is described.It is proposed that the gascarrying pressure flow is classified as pressure flow and is regarded as the boundary flow pattern between mixed freesurfacepressure flow and pressure flow.The hydraulic characteristics of mixed freesurfacepressure flow are defined.The relative acting head range of upstream is 1.61~2.40.The flow pattern is discontinuous on the free surface and changes with time and space.At the same discharge,the reservoir water level fluctuates greatly,and the diversion ratio of the inner tunnel changes in a positive direction,while the diversion ratio of the outer tunnel changes in a reverse direction.The pressure characteristics along the way show alternating changes of pressure flow characteristics and open flow characteristics,and the action pressure turbulence is strong.

关 键 词：长陡坡导流隧洞 双洞双弯 明满交替流 压力特性 分流比 

分 类 号：TU43[建筑科学—岩土工程]