简介:AnumericalcasestudyonidentifyingtheoptimumnumberofbucketsforaPeltonturbineispresented.Threeparameters:numberofbuckets,bucketradialpositionandbucketangularpositionaregroupedsincetheyarefoundtobeinterrelated.Byidentifyingthebestcombinationoftheradialandangularpositionforeachnumberofbucketsitisshownthatreductioninthenumberofbucketsbeyondthelimitsuggestedbytheavailableliteraturecanimprovetheefficiencyandbebeneficialwithregardtothemanufacturingcomplexityandcostperspective.Theeffectofthisreductioninthenumberofbucketswasconfirmedexperimentally.
简介:Theresearchpurposeofthispaperistoestimatetheimpactsoftheparametersoftheguideplateontheverticalmotioncharacteristicsofthemoonpoolfluid.Withthevolumeoffluid(VOF)method,three-dimensionalmodelsofthemoonpoolfluidmotionsofthetrusssparplatformareestablished.Simulationresultsarethenpresentedforthemoonpoolforcedoscillationbyemployingthedynamicmeshmethodanduser-definedfunctionsinFLUENT.Themotionsofthemoonpoolfluidandtheloadsontheguideplatesareobtainedforbothcasesofsquare-ringandcrisscross.Theresultsshowthattheshapeandareaoftheguideplateatthebottomofthemoonpoolhaveasignificantimpactonthephysicalparametersofthemoonpool,includingtheloadonthemoonpoolguideplate,motionformofthemoonpoolfluidandthemassflowrate.
简介:Gas-solidtwo-phaseflowinacirculatingfluidizedbed(CFB)isaffectedbyoperatingconditions(e.g.,superficialgasvelocity,solidsinventory),materialpropertiesandgeometricfactors,suchastheentryandexitconfiguration.Inparticular,thesuspensionsection,whichislocatedbetweentheriserbottomandthesolidsrecycleinlet,affectsthehydrodynamicsintherisersignificantly.However,thesuspensionsectionhasreceivedlessattentioncomparedwithothergeometricfactors.Mostcomputationalfluiddynamics(CFD)simulations,especiallytwo-dimensionalsimulationsdonottakethisfactorintoaccount.Weperformedthree-dimensional,full-loopCFDsimulationswithadragcoefficientthatwasdeterminedbytheenergy-minimizationmulti-scalemodel,andinvestigatedtheflowbehavioroftwoCFBswithdifferentsuspension-sectionlengths.ThesimulationresuitsrevealedthattheaxialprofilesofvoidageintheriserwithalongersuspensionsectionaremorelikelyS-shaped,whereasthosewithshortersuspensionsectionsdecayexponentially.ThedependencesofsolidsfluxonsolidsinventorydifferinthetwoCFBs.Ashortersuspensionsectionmayresultinasmoothtransitionfromdilutetodensetransportwithoutintermediateaccumulativechoki-ng,whereasaIongersuspensionsectionmayleadtoachokingtransition.Thesesimulationresultsarequalitativelyconsistentwiththeflowbehaviorsdescribedinliterature.