消力戽面沿程脉动压强特征研究  

Study on the Characteristics of Fluctuating Pressure on Bucket with Different Flow Regimes

作　　者：韩晓维[1] 徐岗[1] 吴佩峰 屠兴刚[1] HAN Xiaowei;XU Gang;WU Peifeng;TU Xinggang(Zhejiang Institute of Hydraulics and Estuary,Hangzhou 310020,China;Zhejiang Kaihua Reservoir Development Co.,Ltd.,Kaihua 324330,China)

机构地区：[1]浙江省水利河口研究院,浙江杭州310020 [2]浙江省开化县开化水库开发有限公司,浙江开化324330

出　　处：《人民黄河》2020年第7期112-115,150,共5页Yellow River

摘　　要：为研究戽流消能时戽面脉动压强特征及变化情况,结合实际工程,建立1∶60物理模型,应用DJ800多功能采集系统,对自由戽流、附着戽流、临界戽流及稳定戽流流态时戽面脉动压强进行观测。对戽面脉动强度特征、概率密度特征及频谱特性等参数进行统计,结果表明:戽流流态发生变化时戽面脉动压强随之发生变化,在泄流平顺的条件下,戽面脉动压强由大到小依次为稳定戽流>临界戽流>附着戽流≈自由戽流。戽面脉动压强概率密度基本符合正态分布,但临界戽流流态时,戽面鼻坎处峰态系数较大,且略有正偏。戽面上脉动压强主频主要集中在低频段,但随着下游水位的升高及流态的变化,戽面上脉动压强逐渐向高频段移动。In order to study the pressure fluctuation on spillway with bucket flow energy dissipation,based on the 1:60 physical model,this study observed the pressure fluctuation in different flow regimes by DJ800 system and carried out the statistics of some pressure fluctuation characteristics including the intensity,probability distribution and spectrum distribution.The research shows that when the bucket flow regime changes,the pressure fluctuation on the bucket is also changed.The bucket surface fluctuating pressure is in descending order:stable bucket flow>attachment bucket flow>critical bucket flow≈free bucket flow.The bucket surface pressure fluctuation is mainly distributed in the range of±3σ,in accordance with normal distribution,however,in the critical bucket flow regime,the pressure fluctuation kurtosis coeffi⁃cient on the bucket lip is larger than else.The dominant frequency of pressure fluctuation is concentrated in low⁃frequency stage,but with the increase of downstream water level and the changes of flow pattern,the dominant frequency is gradually moved towards high frequency.

关 键 词：消力戽 脉动压强 概率密度 频谱 模型试验 

分 类 号：TV652.1[水利工程—水利水电工程]