摘要
为研究不同闸门开度及水位工况条件下,压坡渐扩式出口泄洪洞洞身及出口流态,采用RNG k-ε湍流模型对压坡渐扩式出口泄洪洞的水力特性进行数值模拟。结果表明:闸门全开时,泄洪洞全洞范围内均呈有压流状态,流态稳定;闸门非全开且水位较低时,洞内流态不稳定,容易出现明满流交替的运行状态;闸门小开度时,挑流鼻坎抬高了出口水位,受出口挑坎反弧阻滞作用,出口段流速有所减缓,挑距较小,水流易冲击坡脚。故对于压坡渐扩式出口泄洪洞,设计时有必要开展水工模型试验研究。
Numerical simulation is carried out for the hydraulic characteristics of the gradual expansion outlet spillway tunnel of a certain project by using RNG k-εturbulence model.The calculation results show that when the gate is fully open,there is pressure flow in the whole tunnel of the spillway tunnel,and the flow state is stable;when the gate is not fully open and the water level is low,the flow state in the tunnel is unstable,and alternating operating states of the free flow and full flow is prone to occur.When the gate is open to a small extent,the flip bucket raises the water level at the outlet,and the lower outlet height causes insufficient air supply in the cave,which is prone to cavitation.The lift distance is small,and it is easy to scour the slope of the hole.It is necessary to carry out hydraulic model test research.for such type of spinway tunnels.
作者
蒋丽珠
邓成发
童利成
JIANG Lizhu;DENG Chengfa;TONG Licheng(Yongkang Huangfen Reservoir Management Office,Yongkang 321300,Zhejiang,China;Zhejiang Institute of Hydraulics&Estuary(Zhejiang Institute of Marine Planning and Design),Hangzhou 310017,Zhejiang,China;Zhejiang Water Conservancy and Hydropower Engineering Management Association,Hangzhou 310020,Zhejiang,China;Zhejiang Provincial Key Laboratory of Hydraulic Disaster Prevention and Mitigation,Hangzhou 310017,Zhejiang,China;Hangzhou Yuhang District Dongtiaoxi Water Conservancy Engineering Operation and Management Center,Hangzhou 311100,Zhejiang,China)
出处
《浙江水利科技》
2023年第5期39-43,共5页
Zhejiang Hydrotechnics
基金
浙江省水利厅科技计划项目(RB2214)
浙江省水利河口研究院院长基金项目(ZIHE21Y003)。
关键词
泄洪洞
数值模拟
挑流鼻坎
k-ε模型
spillway tunnel
numerical simulation
flip bucket
k-εmode
