串列海豹胡须柱杆件周围流场与气动噪声特性分析

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中图分类号：0355 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202405038

Abstract：Basedontheflowsimulationsthroughdelayeddetached-eddysimulation model，themethodsofsparsitypromotingdy namic modedecompositionand spectralproperorthogonaldecompositionareappliedforanalysing themode decompositiononthe wakeflow.Thencombinedbytheacousticanalogyapproach，thisstudyinvestigatesthebehaviourofflowandaerodynamic noise generatedaround tandemseal-vibrisashapedcylinderincomparison withthecasesoftandemcylinderlikeandelipticalarswith the same characteristic length coresponding to the cylinder diameterof 3O mm for arange of Reynolds numbers（Re=6 × 1 ）4～ （204号 1.2 ×10s ）.Resultsshowthattheliftfluctuationsofthedownstreambarsare strongerthan thoseof theupstreambarsandthe downstreambarsdominatetheaerodynamicnoiseradiation.Thealterativearangementofthesaddleandnodalplanesofsealvibrisashapedcylider introduces threedimensionalflowseparations andsuppresses theshearlayer interactions，improvinggreatlythe flow stability.Thestructuredestroys theregularvortexsheddingofKarmanvortexstretocurring intandemcylinder wake.The presenceofreverseVortexsheddinggeneratedbytwoadjacentsaddlesurfaces intheflowoftandemseal-vibrisa-shapedcylinder makesthelateralforcebalancedpartiallyandreducessignificantlyteliftfluctuationsaswellasthevortex-iducedvibrationThe aerodynamicnoisegeneratedbythenon-constantfluctuatingforceexertedonthewallsurfacesofbarsaresuppressdefectively. Thesoundpressurelevelisreducedatmostfrequencies.Therebythetandemsealvibrisashapedcylinderisdmonstratedtohave asignificantnoisereduction efect.Theexperimental measurementsverify theacuracyoftheaerodynamic noise predictions.The current work would provideacertainscientificresearchandengineringapplicationvaluefortheaerodynamic noisecontroloncylinderlike bars.

Keywords：noisecontrol；tandemsealvibrisashapedcylinder；flowbehaviour；flow-inducednoise；anechoicwind-tune experiment

柱体结构群在实际工程领域中得到厂泛应用，如高速列车受电弓、飞机起落架、高层建筑、吊桥拉索与桥梁桥墩等。（剩余16953字）