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:1672643X(2025)02010108
                          Developmentofnearwallturbulentflowindeepdrainage
                                      holesaffectssluicegateflowcapacity


                              RUANYanping,QIUYong,MADepo,JILunyong,KONGDexin
                           (CollegeofWaterConservancy,YunnangAgriculturalUniversity,Kunming650201,China)
                 Abstract:Thedischargecapacityofdeepdrainageholesinhighheadhydraulicstructuresiscloselycor
                 relatedwiththestructuresafety.Theturbulencecharacteristicsoftheflowinfrontofthedeepholewitha
                 fullyopenedradialgate (1.20m)wassimulatedbyRNGk-ε turbulencemodel.Theresultsindicate
                 thatastheappliedwaterheadincreases,thevelocitygradientofthenearwallflowalsoincreases,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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