变顶高尾水洞明满混合流流态分析  

Flow Regime Analysis of Free Surface-pressurized Mixed Flow in Tailrace Tunnel with Sloping Ceiling

作　　者：李进平[1] 杨建东[1] 

机构地区：[1]武汉大学水利水电学院,湖北武汉430072

出　　处：《水电能源科学》2010年第8期86-87,79,共3页Water Resources and Power

基　　金：国家自然科学基金资助项目(50909076)

摘　　要：针对水电站变顶高尾水洞中恒定流条件下明满混合流的界面呈小范围的来回波动现象,采用无压隧洞充蓄度和气液两相流界面稳定理论分析该流态。结果表明,明满混合流界面处局部的水流不稳定段客观存在,但不可能形成全洞长明满流交替和滞气现象,且基于气液两相流界面稳定理论获得的计算值与试验值吻合,为变顶高尾水洞优化设计提供了理论和计算方法支撑。There exist some to-and-fro oscillation phenomenons within small range near the interface of free surface-pressurized mixed flow under the steady flow condition for tailrace tunnel with sloping ceiling in hydropower station.This flow regime is studied by applying the water filling ratio theory of free-flow tunnel and the interface stability theory of gas-liquid coupling two-phase flow.The results indicate that there must locally exist instability flow section near the interface of free surface-pressurized flow,but it is impossible to shape the dramatically oscillation between free flow and pressurized flow along the whole tunnel and the air logged phenomena.The calculation value according to the gas-liquid coupling two-phase flow interface stability theory completely consists with the experimental data.It provides a new theory and calculation method for the optimal design of tailrace tunnel with sloping ceiling.

关 键 词：变顶高尾水洞 混合流 流态分析 Flow 气液两相流 流界面 稳定理论 界面稳定 优化设计 波动现象 无压隧洞 理论分析 计算方法 水电站 试验值 明满流 计算值 恒定流 不稳定 支撑 

分 类 号：TK79[动力工程及工程热物理—流体机械及工程] TV7[水利工程—水利水电工程]