简介:SHIPHYDRODYNAMICSBASICRESEARCHINTHEUNITEDSTATES¥EdwinP.Rood(MechanicsandEngergyConversion(333),OfficeofNavalResearchArlington...
简介:(IWSH'2015,26-28August2015,Glasgow,UK)In1999,thefirstInternationalWorkshoponShipHydrodynamicswassuccessfullyheldinWuhan,China.ThenitwasheldinWuhan,Shanghai,Zhenjiang,Harbin,Seoulinsubsequenteverytwoyears.TheseConferenceshaddrawnavarietyofinternationaldelegatesincludingscientists,engineersandresearcherswithacommoninterestinshiphydrodynamics.Theyprovidedaforumtopromotescientific
简介:Inthisarticle,anewacoustictesttechniqueusingtowedmodelwasintroducedtostudyflownoisecausedbyasurfaceship.Theprojectofmodeltestwasbeproperlydesignedforacousticsignalcollectingandwiththehelpofappropriatedataprocessingmethoddifferentkindsofacousticsourcescouldbesuccessfullyidentified.Alotofworkaboutfuidnoisecouldbecarriedonwiththetowedmodel,andthenoisecorrespondingtolowfrequencywhichisespeciallyinterestedforitslongdistanceradiatingwithsmallattenuationcouldalsobestudiedinthisway.
简介:Turbulencepropertiesofawall-boundedturbulentmixinglayerassociatedwithanopeningstepwereextensivelymeasuredusingI-andX-typehotwires.Theturbulentmixinglayerflowwasanalyzedintermsofwallstaticpressuredistribution,turbulenceintensity,Reynoldsstress,streamwisevelocityprofileandcontinuouswavelettransformcoefficients.Developmentofvorticalstructuresembeddedintheturbulentmixinglayerwastemporallyandspatiallyresolvedbyusingcontinuouswavelettransform.Theconstraintofthedownstreamsolidwallonthemixinglayerflowwasdelineated.
简介:Thevelocitiesofboundarylayerflowsbetweentwoparalleloscillatingplatesseparatedbysmalldistance,i.e.,insocallednarrowchannel,weretheoreticallyandexperimentallystudied.ThefocuswasonthelaminarcasewheretheReynoldsnumberReAismuchsmallerthanthetransitionvalue.ThetheoreticalanalysisoftheStokeslayerinoscillatingflowoveranarrowchannelwasmadefirst.ThenLaserDopplerVelocimeter(LDV)wasemployedtomeasuretheStokesboundarylayeraboveanoscillatingflatplateandinsidetheoscillatingnarrowchannelatvariousReHnumbers.Atthesametime,thephaseangledifferencealongtheverticaldirectioninbothanalysisandexperimentwereprovided.Thegoodagreementsareshownbetweenthemeasuredresultsandthetheoreticalsolution.
简介:Inthispaper,recentmeasurementsoftipvortexflowwithandwithoutcavitationcarriedoutinCavitationMechanismTunnelofChinaShipScientificResearchCenter(CSSRC)arepresented.TheelliptichydrofoilwithsectionNACA662-415wasadoptedastestmodel.High-speedvideo(HSV)camerawasusedtovisualizethetrajectoryoftipvortexcoreandtheformoftipvortexcavitation(TVC)indifferentcavitationsituations.LaserDopplervelocimetry(LDV)wasemployedtomeasurethetipvortexflowfieldinsometypicalsectionsalongthevortextrajectorywiththecaseofcavitationfree.Stereoparticleimagevelocimetry(SPIV)systemwasusedtomeasurethevelocityandvorticitydistributionswithandwithoutcavitation.Seriesmeasurementresultssuchasvelocityandvorticitydistributions,thetrajectoryoftipvortexcore,thevortexcoreradius,cavitysizeandcavitationinceptionnumberwereobtained.Theresultsdemonstratedthattheminimumpressurecoefficientinthevortexcoreobtainedbyflowfieldmeasurementwasquitecoincidentwiththetipvortexcavitationinceptionnumberobtainedundertheconditionofhighincomingvelocityandlowaircontent.AndTVCwoulddecreasethevortexstrengthcomparingwiththecasewithoutcavitation.