大扩散角二级消力池水流结构的调控方法  

Method for Regulating Water Flow Structure of Two-stage Stilling Basin with Large Diffusion Angle

作　　者：马腾飞 杨明杰 储高群 MA Teng-fei;YANG Ming-jie;CHU Gao-qun(Schoolof Hydraulic Engineering,Wanjiang University of Technology,Ma’anshan 243031,China)

机构地区：[1]皖江工学院水利工程学院,安徽马鞍山243031

出　　处：《水电能源科学》2024年第6期125-128,共4页Water Resources and Power

基　　金：安徽省2021年高校优秀青年人才支持计划项目(gxyq2021242)。

摘　　要：针对每侧扩散角均为12°的二级消力池在中低水位时翼墙附近易产生大范围回流区致使主流居中的问题,基于物理模型试验,研究了可增强消力池内水流横向扩散均化作用的工程方法及其适宜位置。结果表明,在第一级消力池内布设分流底坎低水位时易产生急流飞溅不良流态,海漫段的水流跌落区范围较原方案时增大,最大跌落长度可为原方案时的1.77倍,不利于下游防冲安全;在第二级消力池中部布设分流底坎可明显增大左右岸处纵向出池流速,出池流速横向分布更均匀,与原方案相比其离散系数在中低水位区间平均可减小23.1%,低水位时出池水流最大跌落长度可减小22.6%,并可壅高第一级消力池内水深,提高两级消力池的消能率,总消能率最大可提高至55.53%,使消力池的整体消能防冲性能进一步增强。该成果可供水闸设计及除险加固时参考。When the diffusion angle on each side of the two-stage stilling basin is 12°,it is prone to generate a scale large-reflux zone near each wing wall at medium and low water levels,which will cause the mainstream to be centered.Based on the physical model test,an engineering method and its suitable layout location were studied to enhance the al later-diffusion and homogenization effect of water flow in the stilling basin.The results indicate that setting a diversion tom bot-sill in the first stage stilling basin can easily generate rapid splashing at low water levels.The range of water flow drop zone in the apron increases compared with the original scheme,and the maximum drop length can be 1.77 times that of the original scheme,which is not conducive to the safety of downstream erosion prevention.Setting a diversion bottom sill in the middle of the second stage stilling basin can significantly increase the longitudinal outflow velocity at the left and right banks.The lateral distribution of outflow velocity is more uniform,and its dispersion coefficient can be reduced by an average of 23.1%in the middle and low water level range compared with the original scheme.At low water levels,the maximum drop length of the water flow out of the second stage stilling basin can be reduced by 22.6%.It can also raise the water depth in the first stage stilling basin,improve the energy dissipation rate of both stage stilling basin,increase the total energy dissipation rate to a maximum of 55.53%,and further enhance the overall energy consumption and sion ero-prevention performance of the stilling basin.The results can be used as a reference for the design and reinforcement plan of the gate.

关 键 词：大扩散角 二级消力池 分流底坎 横向均化 适宜位置 

分 类 号：TV653.1[水利工程—水利水电工程]