摘要
为了适应工程地形所需的复合底流消力池以其布置形式简单、工程投资小等优点,在中小型水库工程中得到广泛应用,但其在非对称入流条件下普遍存在水流流态复杂、消能率低等各种问题。基于抚宁抽水蓄能电站下库泄洪消能建筑物,采用水力学模型试验与数值模拟相结合的方法,对复合消力池消能体型及入流方式进行了研究。结果表明:将传统消力池的均匀对称入流方式调整为适宜的非对称方式后,既扩大了消力池水流入水的空间范围,又保留了三元水跃高消能率的优点,同时也解决了因入流不均匀及消力池体型不对称而产生的消力池内水流旋转问题。通过模型试验和数值计算发现,这种底流消能体型布置方式极大提高了入射水体与下游水垫的剪切碰撞作用,降低了消力池临底流速与底板压强,且流态稳定,适于工程不同工况的安全运行,也使消力池总消能率提升了约10%。
The compound underflow stilling pool adapted to the needs of engineering terrain has been widely used in small and medium-sized reservoir projects because of its simple layout and low engineering cost,but it has various disadvantages such as complex flow pattern and low energy dissipation rate under asymmetric inflow conditions.Based on the flood discharge and energy dissipation structure in the lower reservoir of Funing Pumped Storage Power Station,the energy dissipation type and inflow mode of the compound stilling pool are studied by means of hydraulic model test and numerical simulation.The results show that when the conventional uniform and symmetric inflow mode is adjusted to an appropriate asymmetric one,the space range of inflow water in the stilling pool is expanded,the asymmetric inflow not only takes the advantage of high energy consumption rate of ternal hydraulic jump,but also eliminates the problem of flow rotation in the stilling pool caused by non-uniform inflow and asymmetric body type of the stilling pool.Experiment and numerical calculation results show that the underflow energy dissipation of this arrangement type greatly improves the shear collision between the incident water body and the downstream water cushion,reduces the underflow velocity and floor pressure,and keeps the flow state stable,it can increase the total energy consumption rate of the stilling pool by about 10%,and meets the requirement of safe operation under various working conditions in the same time.
作者
吴伟
尹进步
张曜
吴西杰
王彩霞
WU Wei;YIN Jinbu;ZHANG Yao;WU Xijie;WANG Caixia(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China;PowerChina Beijing Engineering Corporation Limited,Beijing 100024,China)
出处
《水资源与水工程学报》
CSCD
北大核心
2024年第3期136-144,共9页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(51279170)。
关键词
底流消能
非对称入流
复合消力池
水流旋转
水力特性
underflow energy dissipation
asymmetric inflow
compound stilling pool
flow rotation
hydraulic characteristics
