某水电站溢洪道挑流鼻坎体型研究

Research on Flip Bucket Shape in Spillway of a Hydropower Station

某水电站位于高山峡谷区,泄水建筑物布置在右岸,溢洪道出口下游河道十分狭窄,出口消能设计应充分考虑对下游岸坡的影响,避免顶冲对岸,因此需对挑流鼻坎体型进行重点研究。通过水工模型试验,结合工程特点,对不同体型的挑坎进行分析,最终推荐四窄缝差动挑坎体型。结果表明,四窄缝差动挑坎在各工况下流态较好,水舌纵向拉开且落点处于河道中间位置,对两岸边坡影响较小,可满足工程安全运行要求。研究成果可为狭窄河床的溢洪道消能设计提供借鉴。

A hydropower station is located in a high mountain canyon area,the discharge structure is arranged on the right bank,and the downstream river channel of the spillway outlet is very narrow.The energy dissipation design of the oulet should fully consider the impact on the downstream bank slope and avoid the top rushing to the opposite bank.Therefore,it is necessary to focus on the study of the flip bucket shape.Through the hydraulic model test,combined with the engineering characteristics,the buckets of different shapes are analyzed,and the four-slit differential flip bucket shape is finally recommended.The results show that the flow pattern of the four-slit differential flip bucket is better under various working conditions;The water tongue is pulled apart longitudinally and the flling point is in the middle of the river,which has lttle influence on the slope of both banks and can meet the requirements of safe operation of the project.The research results can provide reference for the energy dissipation design of spillway in narrow riverbed.