
第30琴,第2期 2018年4月
浙江水利水电学院学报
J. Zhejiang Univ of Wat. Res & Electrie Pow
DOI; 10. 3969/j. issn. 2095-7092. 2018. 02. 007
渐扩式消力池水跃长度的分析与计算
张田桦
(浙江省水利水电勘测设计院,浙江杭州310002)
Vol.30No.2 Apr.2018
摘要:为研究渐扩式消力池水跃长度的计算方法,通过分析已有新扩式消力池水跃长度公式,用线性拟合的方法得出新扩式消力池水跃长度的计算公式,认为相对水联长度随联前断面弗劳稳教近似呈线性分布,并随着跃前断面弗劳稳数的增大而增大;在3.5
(9)能满足工程运用,并且计算的水跃长度随着跃前断面弗劳德数的增大而增大关键词:新扩式消力池;水跃长度;跃前断面水深;边墙扩散角
中图分类号:TV135.2*1
文献标志码:A
文章编号:1008536X(2018)02-0029-04
Analysis and Calculation on Length of Hydraulic Jump in Divergent Stilling Basin
ZHANG Tian-wei
( Zhejiang Design Institute of Water Conservancy and Hydroelectric Power, Hangzhou 310002, China)
Abstract: The new calculation method on length of hydraulic jump oceurring on gradually expanding stilling basin is re searched. The calculation equation about length of jump is proposed through the method of linear fit based on the existed e-quations. It shows that the relative length of jump is the linear function of upstream Froude, and it is increasing with the in-creasing of upstream Froude. The caleulated results of Eq- (3) and the Eq- (4) are significantly smaller than the other e-quations, which are unsafety to engineering application at the 3. 5 < Fr, <7. 5. And the Eq- (8) is sensitive to divergence angle of side wall so that the structure of it is flawed. The Eq- (9) is able to satisfy the engineering application with 9 <9° and the results of it is also increasing with the increasing of upstream Froude.
Key words : divergent stilling basin; length of hydraulic jump; initial depth; divergent angle of side wall
当溢洪道出口较窄而下游河道较宽时,常采用渐扩式消力池,用以衔接上游水流与下游河槽.发生于渐扩式消力池中的水跃称渐扩式水跃
张志恒通过研究陡坡扩散消力池的水工模
型试验发现,渐扩式消力池跌后水深较司一流量下一般矩形二元水跃跃后水深小4%~14%.陈椿庭[2]研究表明,当渐扩式水跃跃后断面宽度与跃前断面宽度比6,/b,=2时,所需的下游水深可减小1/ 10.可见,渐扩式消力池较一般矩形消力池具有更好的消能效果
收稿日期:2018-01-25
作者简介:张田桦1985-),男,浙江杭州人,工程师,研究方向
为水工结构及岩土工程设计万方数据
渐扩式水跃的研究主要包括水跃默后水深与水跃长度.现阶段很多学者提出了渐扩式水跃跃后水深的计算方法"3-6],浙扩式水跃跃后水深的研究已比较成熟.而渐扩式水跃长度的研究远没有水跃跌后水深研究的深人和透彻,我国澄洪道设计规范[7]虽给出了渐扩式水跃跃后水深的计算方法,但未给出渐扩式水跃长度的计算公式.作者旨在分析现有渐扩式水跃长度公式的适用性的基础上,提出新的渐扩式水跃长度的计算方法,以供设计参考,
现有渐扩式水跃长度公式的分析现行的水跃长度计算公式主要如下:
中国水利水电科学研究院水跃长度计算公式为:【8