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                                Explorationandanalysisofthemechanism ofKarmanvortex
                                           inducedvibrationinFrancisturbine

                                    MENGLong,ZHANGChiye,XUHongquan,YIYanlin
                                (ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100038,China)

                  Abstract:Karmanvorticesinhydraulicturbinesmaygeneratevibrationandotherissues.StrongKarmanvortex
                  frequencyvibration ,foundatanumberofhydropowerplantsequippedwithFrancisturbines,andinsomecases
                  causingcracksinrunnerblades ,iswidelyregardedasKarmanvortexresonancebyseveralstudies.Thisstudyre
                  vealedasignificantdifferencebetweentheKarmanvortexfrequencyandthenaturalfrequencyoftherunnerblade ,
                  andanewperspectivewasproposedbasedonthespecificpracticeofreducingKarmanvortexfrequencyvibrationin
                  DachaoshanPowerStationbydecreasingtrailingedgethickness ,indicatingthatresonancewasnottheprimary
                  causeofstrongvibrationevenwhenthevibrationfrequencywastheKarmanvortexfrequency.Theimpactofdis
                  chargeandcavitationcoefficientonvisibleKarmanvorticeswasexaminedinamodelturbineKarmanvortexobser
                  vationtest.VisibleKarmanvorticeswerediscoveredeasiertoformincircumstanceswithlargerdischargeorlower
                  cavitationcoefficient.ItwasnotedthatKarmanvorticesbecamevisibleonlywhencavitationoccurredinthevortex
                  core.TheanalysisofeffectivevibrationreductionoperationsrevealedthatKarmanvortexresonancedoesexistatlow
                  flowconditions ,butitwasnotnoticedduetothesmallvibrationamplitude;andthestrongKarmanvortexfrequen
                  cyvibrationathighflowconditionswascausedbyamassiveimpactforceformedbythecollapseofcavitybubbles
                  ratherthanresonance.
                  Keywords:turbine;Karmanvortex;resonance;naturalfrequency;vibrationmode;cavitationcavity

                                                                                    (责任编辑:王 婧)







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