摘要
为了满足过流能力的同时进一步提高消能效果,在一级齿墩式内消能工研究的基础上,采用理论分析和物理模型试验方法,对断面收缩比为0.5、齿墩数目为4、齿墩长度为13.5cm的二级齿墩进行物理试验,分析了二级齿墩式内消能工相对旋转后的水力特性。结果表明,脉动压强系数沿程分布规律基本一致,从一级齿墩开始到二级齿墩结束,受齿墩突缩突扩影响,脉动压强系数变化最明显,在4.2倍的管径附近脉动压强系数达到最大,在6.5倍的管径附近,脉动压强系数逐渐恢复平稳;当两个齿墩相对旋转角越小时,过流能力越好,消能率越小;当两个齿墩相对旋转角越大时,过流能力变弱,消能率变大。
In order to meet flow capacity and improve energy dissipation effect simultaneously,on the basis of the study of energy dissipation in the first-class tooth pier,the theoretical analysis and physical model test method were used to analyze the hydraulic characteristics of the secondary tooth pier internal energy dissipator by physical test of secondary tooth pier whose the shrinkage ratio of section is 0.5,number of pierces is 4and the pier length is 13.5cm.The results show that the pulsating pressure coefficient is basically the same distribution law along the distance;from the beginning of the first-stage pier to the end of the secondary pier,affected by the sudden shrinkage and expansion of the tooth pier,the change of pulsating pressure coefficient is obvious;the maximal pulsating pressure coefficient appears near 4.2times of the pipe diameter;at the near 6.5times of the pipe diameter,pulsating pressure coefficient gradually attains steady;when the two tooth pier relative rotation angle is smaller,the better the flow capacity is,the smaller the energy dissipation rate is;while the relative rotation angle of two tooth pier is larger,the flow capacity becomes weaker and the energy dissipation rate becomes larger.
出处
《水电能源科学》
北大核心
2017年第9期73-76,共4页
Water Resources and Power
关键词
齿墩式内消能工
物理模型
消能率
过流能力
tooth pier internal energy dissipater
physical model
energy dissipation rate
flow capacity
