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Influenceofcavitationontheaddedmassanddamping
characteristicsofavibratinghydrofoil
1,3
2
1,3
1
ZENGYongshun,QIXin,YAOZhifeng ,WANGFujun
(1.CollegeofWaterResources&CivilEngineering,ChinaAgriculturalUniversity,Beijing 100083,China;
2.BAPTEECLTD,Beijing 100176,China;
3.BeijingEngineeringResearchCenterofSafetyandEnergySavingTechnologyfor
WaterSupplyNetworkSystem ,Beijing 100083,China)
Abstract:Pumpedstorageunitsneedtofrequentlyadjusttheiroperatingconditionstomeettheneedsoftheelec
tricgrid.Thiswidensthefrequencyrangeofthehydraulicexcitationandincreasestheriskofresonance.Added
massanddampingcharacteristicsarekeyparametersforevaluatingtheresonanceoperatingpointandresonanceam
plitude,respectively.Whencavitationoccurs,thefluidflowingaroundthebladechangesfromliquidphasetova
porphase ,anditscomplexfluid - structureinteraction(FSI)affectstheaddedmassandhydrodynamicdamping
characteristicsofablade.Inthispaper ,thebladeissimplifiedasaNACA0009hydrofoil,andtheprediction
methodofaddedmassandhydrodynamicdampingcharacteristicsbasedontwo - wayFSIisexploredundercavitation
conditions.Theresultsshowthatthesimulatednaturalfrequencyinstillwaterandthecavitationsheddingfrequency
underdifferentcavitationnumbersareingoodagreementwiththeexperimentalresults ,andtherelativeerrorsare
within7.12% and8.76%,respectively.Whenthecavitationnumberisintherangeof1.04 - 2.02,thenaturalfre
quencyandhydrodynamicdampingincreaseanddecreaserespectivelywiththedecreaseofcavitationnumber,and
theaverageerrorsrelativetotheexperimentresultsare9.69% and13.65%, respectively.Theinternalflow
analysisshowsthatthere - entrantjetcausesthecavitationattheleadingedgetoshedperiodically,andthede
creaseintheflowvelocityaroundthesuctionsurfacemaybethemainreasonforthedecreaseinhydrodynamic
dampingafterthecavitationoccurs.Theresearchresultshaveimportantguidingsignificanceforthebladevibration
evaluationunderthecavitationconditioninthedesignstageofapumpedstorageunit.
Keywords:hydrofoil;cavitation,two - wayFSI;addedmass;hydrodynamicdampingratio
(责任编辑:王 婧)
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