带阻尼井的变顶高尾水系统水力过渡过程数值预测及其特性研究  

Hydraulic Transient Process Numerical Prediction and Its Characteristics Study of Inclined-roof Tailrace Tunnel with Damping Tank

作　　者：桂绍波 田子勤 郑涛平 

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430010

出　　处：《水力发电》2014年第5期58-61,80,共5页Water Power

摘　　要：机组及输水系统在暂态过程中性能参数的控制对电站的安全稳定运行具有重要影响。基于瞬变流数学模型和Priessmann假设,对三峡地下电站采用的带阻尼井的变顶高尾水隧洞进行了过渡过程数值预测,并将计算结果与电站现场试验值进行了对比验证,总结了带阻尼井的明满交替流等复杂水力过程的数值预测模型。基于计算结果分析了在大小波动等暂态过程中变顶高尾水系统明满交替流及阻尼井的水力特性,并从水力学和系统稳定性的角度解释了三峡地下电站采用变顶高尾水洞并设置阻尼井能够代替调压室的原因。Based on transient flow mathematic model and Priessmann hypothesis, the transient processes under seven operation conditions are predicted for the inclined-roof tailrace tunnel with damping tank in Three Gorges underground power station. The calculation results are compared with field test data. The mathematic model for studying the complicated hydraulic process with alternating non-pressure flow and pressure flow is concluded. The hydraulic rules of unsteady flow in inclined-roof tailrace tunnel and damping tank during the transient processes of large and small fluctuations are analyzed based on calculation results, and the reason of applying inclined-roof tailrace tunnel with damping tank to replace surge tank in Three Gorges underground power station is explained from the view of hydraulic rule and system operation stability.

关 键 词：阻尼井 变顶高尾水隧洞 过渡过程计算 三峡地下电站 

分 类 号：TV732[水利工程—水利水电工程]