某节制闸工程泄流消能试验研究

Test Research of the Flood Discharge and Energy Dissipation of a Check Gate Project

某节制闸工程设计方案在低尾水位开启泄流时,消力池中产生远驱水跃,消能效果差,水流出池后余能较大,下游河道冲刷严重.针对节制闸消能设计存在的问题,通过模型试验进行修改方案试验研究.经过不同方案的对比,确定消力池深度由原来的1.0 m加深到1.8 m,池长保持不变,同时在消力池中设置一排高2.0 m的梯形消能墩.该修改方案较好地适应了节制闸低尾水位开启泄流时的水流条件,提高了低弗劳德数水跃消能效率,降低了跃后二级涌浪的强度,消能流态得到改善.修改方案已被工程设计单位采用.

When a check gate discharges at low water level,there was remote hydraulic jump in the stilling basin,so the dissipation effect was poor.In this case,the downstream river course would be scoured seriously because of the excess energy of the water.Aiming at the problems existed in energy dissipation design of the check gate,a revised scheme was carried out through model experiments.Based on comparing different schemes,the depth of the stilling basin was determined to increase from 1 meter to 1.8 meters and the length remained constant.At the same time,a line of 2 meters high trapezoidal energy dissipation piers were set up in the stilling basin.This revised scheme adapted better to the water condition when the check gate discharged at low water level,and it improved the hydraulic jump energy dissipation efficiency at low Froude number and reduced the second-time surge's strength as well as the flow pattern of energy dissipation greatly improved.The revised scheme has been applied to the project design.