摘要
利用声学多普勒测速仪(ADV)实测了凹口溢流堰与同侧布置竖缝组合式鱼道的三维瞬时流速,应用射流力学和紊流统计理论剖析了鱼道水池内的时均流速、紊动强度、雷诺应力、相关函数、紊动尺度等紊流结构。试验研究结果表明:溢流堰与竖缝组合式鱼道池内水流流态呈现出复杂的三维紊流结构;同竖缝相比,溢流堰对紊动强度和雷诺应力的变化有着更为显著的影响,尤其是鱼道池内表层区域;堰流区涡旋的相关性比竖缝壁面射流区好,并且堰流区存在较大尺度的涡旋结构,而竖缝壁面射流区的涡旋尺度则较小。相比单一式鱼道,组合式鱼道紊流结构更加复杂,研究结果可为优化鱼道设计、修复鱼类生境提供参考。
Three-dimensional instantaneous flow velocity was measured by an Acoustic Doppler Velocimetry(ADV)in a combined fishway with an overflow notched weir,and a vertical slot with an identical layout.Turbelent structures,such as time-averaged velocity,turbulence intensity,Reynolds stress,correlation function,and turbulence scales in the fishway pool were analyzed based on the jet mechanics and statistical theory of turbulence.The experimental results showed that flow patterns in the combined fishway pool of the overflow weir and the vertical slot,exhibited complex three-dimensional turbulent structures.The effects of the overflow weir on turbulence intensity and Reynolds stress were more considerable,relative to the vertical slot,especially in the pool surface layer.But correlation of the eddy structures in the weir flow region was better than that in the wall jet region,due to vertical slot.Also there were larger eddy structures in the weir flow region,whereas the eddy size in the wall jet region was smaller.Compared with the single fishway,turbulent structures in the combined fishway were more complicated.These studied results can provide an important guide for optimizing fishway design and rehabilitating fish habitat.
作者
董志勇
余俊鹏
黄洲
DONG Zhiyong;YU Junpeng;HUANG Zhou(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China)
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2021年第2期279-285,共7页
Advances in Water Science
基金
国家自然科学基金资助项目(51779225)。
关键词
紊流结构
溢流堰
竖缝
组合式鱼道
turbulent structures
overflow weir
vertical slot
combined fishway
