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[22] 徐洪泉,王万鹏,廖翠林,等.空腔危害及压力脉动传递机理研究[M]??第二十次中国水电设备学术讨论
会论文集.北京:中国水利水电出版社,2015.
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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