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Analysis of Three Dimensional Dynamic Stall

Analysis of Three Dimensional Dynamic Stall

ID：40878879

大小：2.48 MB

页数：154页

时间：2019-08-09

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1、AnalysisofThree-DimensionalDynamicStallAntonellaFerrecchiaThesissubmittedtotheFacultyofEngineering,UniversityofGlasgow,fortheDe-greeofDoctorofPhilosophy.Allaspectsoftheworkpresentedhereinareoriginalinconceptwhereindicated.TheresearchwasconductedbetweenOctober1997andOctober2000attheDe-partmentofAeros

2、paceEngineering,UniversityofGlasgow.AntonellaFerrecchia,December2000c2000AntonellaFerrecchiaAbstractThepurposeofthisworkistoenhancetheunderstandingofthedynamicstallpro-cessinboththetwodimensionalandthree-dimensionalcasesandto ndoutwhata ectsthedevelopmentandgrowthoftheleadingedgevortexassociatedwith

3、thephenomenonofstall.Inherentinthis,thestudyinvolvedtheanalysisofunsteadypressuredatarecordedalongthechordoftestmodelsundergoingaconstantrateramp-upmotion.Thisinvestigation,supportedby owvisualizationtestspointedoutthemainfeaturesofthedynamicstallvortexbehaviouralongthewingspanonbotharectangularanda

4、swepttipwing.Acomparisonoftheaerodynamicfeaturesoftheunsteady owatlocalcross-sectionsofbothwingswiththoseovertheNACA0015aerofoilshowedqualitativesimilarityofthestallprocessinboththetwodimensionalandthreedimensionalcasesandsingledoutthee ectsofthewingspangeometry.Further,thedynamicstallvorticalstruct

5、ureattheleadingedgecouldbeattributedtoalocalvorticityaccumulation.Thevorticity uxwasexaminedtoidentifythemechanismsthatplaykeyrolesintheinitiationanddevelopmentofthevortex.Itwasfoundthatthe uxofvorticityfromthesurfaceoriginatedprimarilyfromtwoconcentratedregionsorsources.Thebehaviourofvorticity uxfr

6、omthesesourceswasrelatedtotheinteractingmechanismresponsibleforthedevelopmentofthe ow eld.Moreover,theinvestigationsuggestedthatthevorticity uxisapracticaliiengineeringtooltopredicttheonsetofthestall.Inaddition,thechangesofthepressureandsurfacevorticity uxvariationsduetochangesinthereducedpitchratew

7、erealsocharacterized.Thelastpartoftheresearchfocussedonaninvestigationofdynamicstallvortexconvectionoverbothtwo-dimensionalandthreedimensionalaerodynamicsurfaces.Fromtheanalysisofthedynamicstallvortex

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