Page 127 - 《水资源与水工程学报》2024年第5期
P. 127

!35 "!5 #                         & ' ( ) & * + , -                               Vol.35No.5
               2024 $ 10 %              JournalofWaterResources&WaterEngineering                 Oct.,2024

            DOI:10.11705/j.issn.1672-643X.2024.05.15


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                 Analysisofjetturbulencecharacteristicsofrectangulardissipationwells

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                         HEYunqiu,QIUYong,QIUZhengkui,LIUHangming,WANGYuxiao
                    (1.CollegeofWaterConservancy,YunnanAgriculturalUniversity,Kunming650201,China;2.YunnanNanyang
                            WaterConservancyandHydropowerSurveyandDesignCo.,Ltd.,Qujing655000,China)
                 Abstract:Rectangulardissipationwellswithobliqueinletsarewellsuitedtonarrowterrainsofremote
                 mountainousareas ;however,thedissipationeffectofthewellsisdirectlyaffectedbytheturbulenceand
                 energydissipationoftheobliquejet.Here ,thelargeeddysimulationmethodisusedtostudytheturbu
                 lencecharacteristicsofthejetinarectangulardissipationwellunderaspecificflowrate.Theresults
                 showthattheaxisareaoftheprimarysubmergedflowatthejetdirectiondisplaysanirrotationalmotion ,
                 whereasrotatingvorticesofvaryingsizesandstrengthsareconcentratedaroundthewaterstream(absolute
                 reductionrateofrelativevorticesalongthejetfallsintherangeof74% -92%).Thevortexintensityis
                 greaterinthefrontpartofthejet,wherethevortexstructureisvisiblydisruptedandthedistribution
                 thicknessissmall.Inthemiddlesectionofthejet ,therangeofvortexseparationandfusiongraduallyex
                 pands,theadjacentvortexareasbegintoformstripstructures,andthevortexintensitydecreasessignifi
                 cantly.Intherearsectionofthejet,theturbulentvortexisfurtherdisrupted,twisted,andspreadsout
                 wards,resultinginafurtherdecreaseinvortexintensity.Thedistributionofturbulenceintensityaround
                 thejetexhibitsaclearpattern ,withlowintensityinthecenterandhighintensityaroundthejet.This
                 distributionalsodemonstratesacertainselfsimilarity.Specifically,theturbulenceintensitygraduallyin
                 creasesalongthepathofthejetwaterstreaminthefrontandmiddlesections(anincreaseof12% -
                14%).Intherearsection,theturbulenceintensitytendstobemoreuniformaroundthejet,butgradual

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