Developed log-wake law and turbulent behaviour of flow along a stepped spillway

IF 1.6 Q3 WATER RESOURCES Water Practice and Technology Pub Date : 2023-10-27 DOI:10.2166/wpt.2023.153
Panaitep Pongcharoenpit, Duangrudee Kositgittiwong, Chaiwat Ekkawatpanit
{"title":"Developed log-wake law and turbulent behaviour of flow along a stepped spillway","authors":"Panaitep Pongcharoenpit, Duangrudee Kositgittiwong, Chaiwat Ekkawatpanit","doi":"10.2166/wpt.2023.153","DOIUrl":null,"url":null,"abstract":"Abstract The log-wake law for turbulent current has been developed and tested with laboratory data on turbulent flow in smooth pipes. However, flow with turbulence and vortices in a stepped spillway have not been described. Therefore, in this study, a log-wake law has been developed for use in stepped spillway systems. It can be divided into three parts. The first part, a logarithmic equation, describes the effect of shear stress between the flow layers with a von Kármán constant of 0.41. The second part, a third-degree polynomial, describes the effect of the shear stress on the wall. The last part, a fourth-degree polynomial, describes the effect of changing the flow pressure distribution, similar to the wall-free shear stress. Calibration tests (68 datasets) are used with a flow rate between 0.0233 and 3.285 m3/s, a spillway slope of 14–30°, and a step height of 0.0380–0.610 m. The developed log-wake law characterized the flow in a stepped spillway well. The limitation of the equation is a maximum flow velocity of 4 m/s; the accuracy of this equation decreases as the step height increases.","PeriodicalId":23794,"journal":{"name":"Water Practice and Technology","volume":null,"pages":null},"PeriodicalIF":1.6000,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Water Practice and Technology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2166/wpt.2023.153","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"WATER RESOURCES","Score":null,"Total":0}
引用次数: 0

Abstract

Abstract The log-wake law for turbulent current has been developed and tested with laboratory data on turbulent flow in smooth pipes. However, flow with turbulence and vortices in a stepped spillway have not been described. Therefore, in this study, a log-wake law has been developed for use in stepped spillway systems. It can be divided into three parts. The first part, a logarithmic equation, describes the effect of shear stress between the flow layers with a von Kármán constant of 0.41. The second part, a third-degree polynomial, describes the effect of the shear stress on the wall. The last part, a fourth-degree polynomial, describes the effect of changing the flow pressure distribution, similar to the wall-free shear stress. Calibration tests (68 datasets) are used with a flow rate between 0.0233 and 3.285 m3/s, a spillway slope of 14–30°, and a step height of 0.0380–0.610 m. The developed log-wake law characterized the flow in a stepped spillway well. The limitation of the equation is a maximum flow velocity of 4 m/s; the accuracy of this equation decreases as the step height increases.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
建立了阶梯式溢洪道的尾流规律和湍流特性
摘要建立了紊流的对数尾迹规律,并用光滑管道紊流的实验数据进行了验证。然而,阶梯式溢洪道中湍流和旋涡的流动尚未被描述。因此,在本研究中,开发了一个用于梯级溢洪道系统的对数尾流定律。它可以分为三个部分。第一部分是一个对数方程,描述了流动层之间剪切应力的影响,von Kármán常数为0.41。第二部分是一个三次多项式,描述了剪力对墙体的影响。最后一部分是一个四次多项式,描述了改变流动压力分布的影响,类似于无壁剪应力。校准试验(68个数据集)使用的流量为0.0233 ~ 3.285 m3/s,溢洪道坡度为14 ~ 30°,台阶高度为0.0380 ~ 0.610 m。建立了阶梯溢洪道井流动的尾流规律。方程的极限是最大流速为4m /s;该方程的精度随着阶跃高度的增加而降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
CiteScore
2.30
自引率
6.20%
发文量
136
审稿时长
14 weeks
期刊最新文献
Hydro-geochemical characterisation and modelling of groundwater in Chikun Local Government Area of Kaduna state, Nigeria A methodology for temporal disaggregation of daily rain gauge data using satellite precipitation product for improved accuracy in hydrologic simulation ACWA: an AI-driven cyber-physical testbed for intelligent water systems Phosphorus removal from ore waste in aqueous solution with different mass of ore waste adsorbent from the Johor mine site Assessment of risks to the quality of water supplied in Bushenyi-Uganda using the water safety plan approach
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1