消力池尾坎坡度对底板脉动压强特性的影响试验研究  

Experimental study on pressure fluctuating characteristics of bottom plate of stilling basin with different end slopes

作　　者：苟小武 刁明军[1] 王川隘 黄桂兵 GOU Xiao-wu;DIAO Ming-jun;WANG Chuan-ai;HUANG Gui-bing(State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065

出　　处：《西南民族大学学报（自然科学版）》2022年第6期701-708,共8页Journal of Southwest Minzu University(Natural Science Edition)

基　　金：四川省学术和技术带头人培养基金(2012DTY020)。

摘　　要：消力池底板脉动压强特性对消力池底板安全稳定具有重要意义,基于模型试验研究4种尾坎坡度(i=1∶0.5、1∶0.75、1∶1、1∶1.2)消力池的底板脉动压强特性,为消力池的设计提供参考.试验结果表明:消力池底板脉动压强概率密度分布函数基本服从正态分布,相比标准正态分布,其峰更加高瘦,且有正偏或负偏现象.消力池尾坎坡度增大,底板最大脉动压强强度系数减小,优势频率降低,底板前部与后部的脉动压力差值减小,尾坎附近(X/L>0.81)测点区域脉动压强瞬间空间相关系数减小、涡旋的保持性降低、脉动能量集中的频带变宽,消力池前、中部(X/L<0.61)测点区域脉动压强相关系数增大、空间积分尺寸增大,涡旋保持性增强.The fluctuating pressure characteristics of stilling basin floor are of great significance to the safety and stability of stilling basin floor. Based on the model test, this paper studied the fluctuating pressure characteristics of the bottom plate of the stilling basin with four kinds of end slopes(i=1∶0.5,1∶0.75,1∶1 and 1∶1.2),to provide reference for the design of the stilling basin.The test results showed that the probability density distribution function of fluctuating pressure on the bottom plate of stilling basin basically obeys the normal distribution, and, when compared to normal distribution, its peak is higher and thinner, and there is positive deviation or negative deviation, and that the end slope increases, the maximum fluctuating pressure intensity coefficient of the bottom decreases, the dominant frequency decreases, the fluctuating pressure difference between the front and rear of the bottom decreases, the instantaneous spatial correlation coefficient of fluctuating pressure in the measuring point area near the tail sill(X/L>0.8) decreases, the retention of vortex decreases, the frequency band of fluctuating energy concentration widens, the correlation coefficient of fluctuating pressure in the area of measuring points in front and middle of stilling basin(X/L<0.6) increases, the spatial integral size increases, and the vortex retention increases.

关 键 词：消力池 尾坎坡度 脉动压强特性 模型实验 

分 类 号：TV135.2[水利工程—水力学及河流动力学]