某闸坝工程跌坎底流消力池体形优化试验研究  

Shape Optimization of a Step-down Floor Stilling Basin in a Sluice Dam Project

作　　者：崔晓玉 李奇龙[1] 李大贵 张宗孝[1] CUI Xiaoyu;LI Qilong;LI Dagui;ZHANG Zongxiao(Faculty of Water Resources and Hydroelectric Engineering,Xi an University of Technology,Xi an 710048,Shaanxi,China)

机构地区：[1]西安理工大学水利水电学院,陕西西安710048

出　　处：《水力发电》2020年第10期127-131,共5页Water Power

摘　　要：大单宽、低弗劳德数闸坝工程底流消能时易存在不稳定流态且消能率低等问题,结合某工程进行了跌坎底流消力池体型优化试验研究。结果表明,原方案采用小挑角跌坎消力池,闸门局开,上下游水位差较大,且下游水位较低运行时,消力池内因挑坎挑射水流与池内水流衔接易产生不稳定流态;将入池挑坎改为平角跌坎并在消力池内布置消力坎后,池内为稳定的淹没水跃,水面变化平缓,池内临底流速不超过10 m/s。优化后的平角跌坎消力池+池内消力坎方案,从根本上解决了原方案水流衔接引起的池内水流剧烈紊动、水面大幅波动、消能不足等问题。The underflow energy dissipation of sluice dam project with large unit width and low Froude number is easy to cause an unstable flow state and a low energy dissipation rate.Combined with an actual project,the shape optimization of the stilling pool is experimentally studied.The results show that,the original designed scheme adopts a small-trajectory angle drop sill,when the sluice gate is partially opened,the water level difference between upstream and downstream is large,and when the downstream water level is lower,the flow in the still basin is easy to be unstable because of the connection between the water jet and the water in stilling pool;after changing the flip bucket into the flat angle step-down floor and arranging a baffle sill in the pool,the flow is in a stable submerged hydraulic jump,the water surface changes gently,and the bottom flow velocity in the pool does not exceed 10 m/s.The optimized scheme can fundamentally solve the problems such as flow turbulence,large fluctuations of water surface and insufficient energy dissipation caused by water flow connection in the original scheme.

关 键 词：闸坝工程 低Fr 小挑角跌坎 消力坎 水力特性试验 

分 类 号：TV135.2[水利工程—水力学及河流动力学] TV653