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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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