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Numericalanalysisofthespiralvortexropeswithinalargebifurcatedpipe
1
1
2
1
2
SHENYan,JIANGZiyun,YANGLi,SONGRuixiang,WANGWei,GUOMiao 1
(1.SchoolofWaterResourcesandHydropowerEngineering,NorthChinaElectricPowerUniversity,Beijing 102206,China;
2.POWERCHINABeijingEngineeringCorporationLimited,Beijing 100024,China)
Abstract:Bifurcatedpipesarewidelyusedincriticalfieldssuchashydropowerstations,pumpedstoragepower
stations,andotherimportantindustries.Thecouplingofbifurcationshape,ribstructure,andflowpatterninlarge -
scalebifurcatedpipes (mainpipediameterofmorethan6meters)leadstotheundesiredspiralvortexropes,which
contributestotheincreaseofnon - negligiblehydrauliclossesofthebifurcatedpipe.Thespiralflowpatternnearthe
ribinthebifurcatedpipewaseffectivelyeliminatedbytheimplementationofguidevanes ,whichwasbasedonthe
establishmentofthenumericalcalculationmodelforthecomplexflowpatternoflarge - scalebifurcatedpipesinthe
presentpaper.Thevalidityandaccuracyofthenumericalresultswereverifiedbycomparingitwithexperimental
data.Specifically,fordifferentflowcasesinbranchpipe,theoptimizedflowofthemainpipeissmooth,andthe
maximumflowvelocityislocatednearthebendofthebranchpipe.Thevortexflowpatternsonbothsidesofthebi
furcationribandspiralflowphenomenoninthebranchpipehaveessentiallyeliminatedafteroptimization.Forthe
3 - unitdouble - sideand2 - unitsingle - sideoperatingcases ,onlyasmallamountofribplateflowisformeddueto
thenon - uniformflowratesinthetwobranches.Ithasbeenproventhattheoptimizedschemeofmulti - guidevanes
caneffectivelymitigateandeliminatetheoccurrenceofspiralflow,whilealsoreducinghydrauliclossesofthebifur
catedpipe.Theresultscangivesomereferenceforhydraulicdesignofbifurcatedpipesandrelatedresearchfields.
Keywords:computationalfluiddynamics;spiralvortexropes;guidevanes;hydraulicloss;hydraulicoptimiza
tion;numericalanalysis;largebifurcatedpipe
(责任编辑:李 娜)
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