Page 105 - 《水资源与水工程学报》2025年第2期
P. 105
!36 "!2 # & ' ( ) & * + , - Vol.36No.2
2025 $ 4 % JournalofWaterResources&WaterEngineering Apr.,2025
DOI:10.11705/j.issn.1672-643X.2025.02.12
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FGHIJ:TV135;TV65 KLMNO:A KPQJ:1672643X(2025)02010108
Developmentofnearwallturbulentflowindeepdrainage
holesaffectssluicegateflowcapacity
RUANYanping,QIUYong,MADepo,JILunyong,KONGDexin
(CollegeofWaterConservancy,YunnangAgriculturalUniversity,Kunming650201,China)
Abstract:Thedischargecapacityofdeepdrainageholesinhighheadhydraulicstructuresiscloselycor
relatedwiththestructuresafety.Theturbulencecharacteristicsoftheflowinfrontofthedeepholewitha
fullyopenedradialgate (1.20m)wassimulatedbyRNGk-ε turbulencemodel.Theresultsindicate
thatastheappliedwaterheadincreases,thevelocitygradientofthenearwallflowalsoincreases,lead
ingtoacorrespondingriseinthethicknessoftheturbulentboundarylayer.Consequently,themeantur
bulentshearstress ,flowturbulenceandenergydissipationincreasesSignificantly.Astheappliedwater
headincreasesfrom12.5to52.5m ,themaximumthicknessoftheturbulentboundarylayer,maximum
shearstress,maximumturbulenceintensityandmaximumturbulencedissipationrateinfrontofthegate
increasesby0.67 ,4.57,0.89,and5.50times,respectively.Underthesecombinedeffects,thedis
chargecoefficientofthedischargeflowfirstincreasesandthendecreaseswiththerisingwaterhead(in
creasesfrom0.915to0.931andthendecreasesto0.930 ).Notably,atanappliedwaterheadof42.5
m ,thedischargecoefficient,whichcharacterizesthedrainagecapacityofthegateopening,reachesits
maximumvalue.Withcontinuedincreaseintheappliedhead ,althoughthedischargeflowcontinuesto
rise,theincrementprogressivelydiminishes,indicatingacorrespondingdeclineinthegate’ssurgedis
chargecapacity.Itindicatesthatwiththeincreaseofappliedwaterhead ,thethicknessoftheturbulent
boundarylayerindeepholesgrows (theeffectiveflowareadecreases),theturbulenceintensityincrea
ses,andtheenergydissipationoftheflowinfrontofthegaterises,leadingtoareducedincreaseinthe
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