闸坝开闸瞬间流态模拟及对下游冲刷影响分析  

Simulation of Flow at Moment of Gate Opening and Analysis of Its Influence on Downstream Scour

作　　者：刘顺东 LIU Shun-dong(Datang Hydropower Science&Technology Research Institute,Chengdu 610031,China)

机构地区：[1]大唐水电科学技术研究院,四川成都610031

出　　处：《水电能源科学》2021年第6期105-107,100,共4页Water Resources and Power

摘　　要：为研究闸坝常规泄水时下游非岩质河床冲刷过深的问题,基于闸坝水跃消能过程理论分析,以某闸坝工程为例,采用数值模拟手段,模拟了闸门开启到形成稳定淹没水跃的过程,分析了下泄流量、下游水深等对水跃长度、下游流速的影响。结果表明,当闸坝闸门起始开度过大,在消力池内稳定水跃形成前,经历短时间的远驱水跃,出池急流加大了下游非岩质河床冲刷。进而提出了控制水跃长度的闸门起始开度计算方法及减缓下游冲刷的工程预防措施,可为闸坝工程运行提供参考。In order to investigate the serious scour in the weathered rock of riverbed below a gate dam,the hydraulic jump energy dissipation theory of gate dam was adopted to simulate water flowing process when the floodgate was from opening to generating the steadily submerged hydraulic jump.Meanwhile,the effect of discharged volume and downstream water depth on the length of hydraulic jump and velocities at downstream of gate dam were analyzed.The results show that the sluice flow would experience a process of repelled downstream hydraulic jump in a short time prior to the stable hydraulic jump occurred in energy dissipation pool,due to the over-opened initial opening of sluice gate,which could cause the flow gushing out from the pool and serious scour of weathered rock occurring on the river bed.The calculation method of initial opening of sluice gate was derived to control the length of hydraulic jump.In addition,the prevention measures for reducing the scouring and energy dissipating downstream of gate dams were suggested,which can provide reference for operation of gate dam engineering.

关 键 词：闸坝 消能防冲 水跃 瞬间流态 数值模拟 

分 类 号：TV653[水利工程—水利水电工程] TV135