摘要
针对不规则渐扩折坡式消力池中的水跃初始断面和水深难以确定的问题,提出了等效收缩断面的假设,利用坎前水深计算等效断面位置和水深,将其引入到渐扩折坡式消力池的水跃消能分析中,提出渐扩折坡水跃消能公式,为渐扩折坡式消力池中的水跃消能特性评估提供依据。此外,通过物理模型试验对渐扩折坡式消力池的水力特性进行测试研究,分析折坡水跃消能的流态、临底流速、脉动压力分布和空蚀空化分布规律。结果表明,采用等效收缩断面的消能率计算公式能够对渐扩折坡式消力池的水力特性进行合理评估,水跃发生在渐扩折坡式消力池的渐扩折坡段上,能有效缩短消力池长度,减少底板空蚀空化风险,提高消能效率。
The hypothesis of equivalent contraction section is put forward in view of the difficulty in determining the initial section and water depth of the hydraulic jump in irregular sloped-type stilling basin.The position and water depth of equivalent contraction section are calculated by using the water depth after hydraulic jump,and the formula of hydraulic jump energy dissipation in the gradually broadened stilling basin with slope is proposed to provide a basis for evaluating the energy dissipation characteristics of water jump.The hydraulic characteristics of this stilling basin are tested and studied by physical model test,and the flow pattern,bottom velocity,pulsating pressure distribution and cavitation distribution of hydraulic jump energy dissipation are analyzed.The results show that the calculation formula of the energy dissipation rate of the equivalent contraction section can be used to reasonably evaluate the hydraulic characteristics.The water jump occurs on the gradually broadened slope section of stilling basin,which can effectively shorten the length of stilling basin,reduce the risk of floor cavitation and improve the energy dissipation efficiency.
作者
詹航
王眺
万五一
ZHAN Hang;WANG Tiao;WAN Wuyi(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,Zhejiang,China)
出处
《水力发电》
CAS
2023年第3期109-115,共7页
Water Power
基金
国家自然科学基金资助项目(52079122)。
关键词
渐扩折坡式消力池
水跃消能
消能率
等效收缩断面
共轭水深
模型试验
gradually broadened stilling basin with slope
energy dissipation of hydraulic jump
energy dissipation ratio
equivalent contraction section
conjugate depth
model test
