摘要
尕干水库因地形原因,在模型实验时发现消力池的设计存在着一系列问题。由于消力池结构的特殊性,左侧有一支沟会进入消力池,支沟与消力池连接段有一底坡1∶100的护坡,消力池水流流入支沟护坡形成一个较大的逆时针回流,对工程带来极大破坏。为了改善这一不良流态及对支沟附加来流的处理,将“附加动量”水跃理论应用到溢洪道消力池的优化设计当中,并通过模型试验验证,对调整过后的消力池的水流流态。压强特性、流速特性及消能机理进行分析。结果表明,优化过后的消力池水流流态良好,有效地消除了回流。压强、流速分布合理,该消力池结构优于常规消力池,因此消能率能达80%以上。消力池尺寸满足工程要求。
Because of the especial topographic conditions,a series of problems in the stilling basin design are found in model experiments of the Gagan Reservoir.Due to the particularity of the stilling basin structure,a branch ditch on the left will enter the stilling basin,and the connecting section between the branch ditch and stilling basin has a slope protection with a bottom slope of 1∶100.The flow of stilling basin water into the slope protection of the branch ditch forms a large counterclockwise backflow,which causes great damages to the project.In order to improve this bad flow pattern and the treatment of additional inflow from branch ditches,the"additional momentum"hydraulic jump theory is applied to the optimization design of the spillway stilling basin.The flow pattern,pressure characteristics,velocity characteristics and energy dissipation mechanism of the adjusted stilling basin are analyzed through model tests.The results show that the flow pattern of the optimized stilling basin is good,with the backflow effectively eliminated.And with reasonable distribution of pressure and velocity,the structure of the stilling basin is better than that of the conventional stilling basin,so the energy dissipation rate can reach more than 80%,and the size of the stilling basin meets the engineering requirements.
作者
杨通
张宗孝
黄智文
YANG Tong;ZHANG Zongxiao;HUANG Zhiwen(State Key Laboratory of Eco-Hydraulics Engineering in Northwest Arid Region of China,Xi’an University of Technology,Xi’an 710048,Shaanxi,China)
出处
《电网与清洁能源》
2019年第4期49-54,共6页
Power System and Clean Energy
基金
陕西省水利科技项目(2018SLKJ-3)~~
关键词
附加动量
水跃理论
消力池
模型试验
水流流态
additional momentum
hydraulic jump theory
stilling basin
model experiment
flow state
