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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

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