水垫塘异型构造底板缝隙水流脉动压力特性研究  

Research on Characteristics of Fluctuating Pressure in the Gap on Special-Shaped Slab of Plunge Pool

作　　者：马斌[1] 岳颖[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2016年第1期96-102,共7页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金青年基金资助项目(51309177);国家科技支撑计划资助项目(2011BAB05B05);高等学校博士学科点专项科研基金(新教师类)资助项目(20120032120051);高等学校学科创新引智计划资助项目(B14012)

摘　　要：水垫塘作为保护下游河床的结构,其自身在高速水流冲击下的安全性是实现消能和防冲目的的关键所在.优化水垫塘底板的结构设计对于整体结构稳定性就具有一定的实际研究价值.以某水垫塘为背景,基于模型试验结果,研究了异型构造底板缝隙处水流脉动压力特性.分析了板块增设键槽前后下表面脉动压力的分布规律、概率特性以及互相关特性和频谱特性,进而从缝隙水流脉动压力的角度分析键槽的增设对底板稳定性的意义.研究表明:在水跃稳定区,带键槽板块间下表面脉动压强系数较不带键槽板块有明显减小趋势;带键槽板块可能产生的脉动上举力较小;增设键槽后,涡旋的保持性和平均尺度增加,板块间相互联系增加;脉动压强的功率谱密度曲线向更低频移动.Plunge pool is the protecting structure of downstream river-bed, and its safety under high-velocity flow impact is the key to success or failure of energy dissipation. Optimizing the structure design of plunge pool slab has certain practical research value for the stability of the whole structure. With a plunge pool hydraulic model test as the research background and based on the model test results, a study was conducted on the characteristics of fluctuating pressure acting on the gap of special-shaped slab of plunge pool. An analysis was made for the distribution of fluctuating pressure, probability characteristic, the cross correlation characteristics and the spectrum characteristics of fluctuating pressure of lower surface with and without keyway on slab. Then the significance of setting keyway for the stability of floor was analyzed from the perspective of fluctuating pressure acting on the gap. The analytical results show that in the impacted area fluctuating pressure intensity coefficient of keyway bottom has a more obvious decreasing trend than without keyway bottom. The possible fluctuating uplift force of keyway bottom is smaller. After adding the keyway, the possession rate and average length of eddy have increased, and the interactivity between floors has increased. The power spectral density curve of fluctuating pressure of the keyway slab is more concentrated on low frequency section.

关 键 词：水利水电工程 异型构造底板 键槽 模型试验 脉动压力 

分 类 号：TK131.6[动力工程及工程热物理—热能工程]