低比转速叶轮水力设计新方法综述(英文)-豆柴文库

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低比转速叶轮水力设计新方法综述(英文)
Title:ReviewofNewMethodsforLowSpecificSpeedImpellerHydraulicDesign
Abstract:
Thedesignofimpellersforlowspecificspeedhydraulicapplicationspresentsuniquechallengesduetotheloweroperatingspeedsandhigherefficienciesrequired.Thispaperprovidesacomprehensivereviewofrecentdevelopmentsandmethodsinlowspecificspeedimpellerhydraulicdesign.Theaimistohighlighttheadvantagesandlimitationsofeachapproachandidentifypotentialareasforfutureresearch.
1.Introduction
Thedesignofimpellersforlowspecificspeedhydraulicmachines,suchaslow-headturbinesandpumps,iscrucialforachievingoptimalperformanceandefficiency.Traditionaldesignmethodsoftenstruggletoaccuratelypredictflowbehaviorandperformanceatlowspeeds.Therefore,newapproachesandtechniqueshavebeendevelopedtoovercomethesechallenges.
2.GeometricalDesignTechniques
2.1.AdvancedBladeProfiles:Oneapproachinvolvesthemodificationofbladeprofilestopromotebetterflowcontrolandreduceenergylosses.TheseprofilemodificationsincludeS-shape,doublecurvature,andparaboliccurves,whichhaveshownpromisingresultsinreducingsecondaryflowsandimprovinghydraulicperformance.
2.2.LeadingandTrailingEdgeModifications:Anotherapproachfocusesonoptimizingtheleadingandtrailingedgesofimpellerblades.Modificationssuchasfilleting,tapering,orintroducingslotshavebeensuccessfullyusedtoimprovehydraulicefficiencyandreducecavitation.
3.ComputationalFluidDynamics(CFD)Techniques
3.1.3DNumericalSimulations:Recentadvancementsincomputationalcapabilitieshaveenabledtheuseof3DCFDsimulationsforlowspecificspeedimpellerdesign.Thisapproachallowsforaccuratepredictionofflowbehavior,recirculationzones,andenergylosses,leadingtooptimizeddesigns.
3.2.Multi-ObjectiveOptimization:CFDsimulationscombinedwithmulti-objectiveoptimizationalgorithmshaveproventobehighlyeffectiveinfindingthebestcompromisebetweenconflictingdesignrequirements,suchasefficiency,head,andcavitation.
4.ExperimentalMethods
4.1.LaserDopplerVelocimetry(LDV):LDVmeasurementsprovidedetailedvelocityprofilesinsidetheimpeller,allowingforb