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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MNFOP:TV135 QRSTU:A QVWP:1672643X(2024)05012307
Analysisofjetturbulencecharacteristicsofrectangulardissipationwells
2
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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
distributionalsodemonstratesacertainselfsimilarity.Specifically,theturbulenceintensitygraduallyin
creasesalongthepathofthejetwaterstreaminthefrontandmiddlesections(anincreaseof12% -
14%).Intherearsection,theturbulenceintensitytendstobemoreuniformaroundthejet,butgradual
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