摘要
针对抽水蓄能电站高落差、小泄量、库区静水的泄洪特点,基于“环形隔墩堰跌流+马蹄型消能井+退水压坡”的跌流式竖井泄洪消能系统,建立比尺为1∶25的竖井泄洪洞物理模型开展了环形隔墩堰堰流特性与竖井系统消能性能研究。试验结果表明:环形隔墩堰综合流量系数为0.4~0.5,可有效控制库区水流对称跌流入井,形成脱壁流消除壁面空化风险并增强井内通气能力;消能井与压坡段协同作用显著提升了消能率和整流效果,马蹄型消能井结构表现出较优的水流消能性能和退水流态稳定性;竖井系统消能率高达88%以上,并随泄量减小而提升。
According to the flood dischargecharacteristics of pumped-storage power plants,such as high head,low discharge,and static reservoir water,a 1:25-scale physical model of a shaft spillway was established based on the shaft system consisting of a circular guide-pier weir,a horseshoe-shaped stilling shaft and a pressurized sloped section,and the flow characteristics of the circular guide-pier weir and the energy dissipation performance of the shaft system were investigated.The experimental results show that the comprehensive discharge coefficient of the circular guide-pier weir ranges from 0.4 to 0.5,effectively ensuring symmetrical flow entry into the shaft and forming detached-wall jets to eliminate wall cavitation risks and enhance air entrainment.The synergistic operation between the stilling shaft and the pressurized sloped section significantly improves energy dissipation efficiency and flow control performance.The horseshoe-shaped stilling shaft demonstrates superior energy dissipation performance and downstream flow regime stability.The energy dissipation rate of the shaft system exceeds 88%,and increases as the discharge decreases.
作者
王芳芳
刘明
祝维卫
樊顾飞
吴修锋
吴时强
WANG Fangfang;LIU Ming;ZHU Weiwei;FAN Gufei;WU Xiufeng;WU Shiqiang(Hydraulic Engineering Department,Nanjing Hydraulic Research Institute,Nanjing210029,China;POWERCHINA Huadong Engineering Corporation Limited,Hangzhou310014,China)
出处
《水利水电科技进展》
北大核心
2025年第6期26-31,共6页
Advances in Science and Technology of Water Resources
基金
中央级公益性科研院所基本科研业务费专项资金项目(Y123010)。
关键词
竖井泄洪洞
环形隔墩堰
消能井
压坡段
能量耗散
物理模型试验
shaft spillway
circular guide-pier weir
stilling shaft
pressurized sloped section
energy dissipation
physical model test
