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dc.contributor.advisorChandrasekhara, Muguru S.
dc.contributor.advisorChandrasekhara, M.S.
dc.contributor.authorBrydges, Bruce E.
dc.date.accessioned2013-01-23T22:09:04Z
dc.date.available2013-01-23T22:09:04Z
dc.date.issued1989-09
dc.identifier.urihttp://hdl.handle.net/10945/27060
dc.descriptionApproved for public release; distribution is unlimiteden_US
dc.description.abstractStroboscopic schlieren photography was used to investigate the efFects of compressibihty, reduced frequency, and amphtude on the dynamic stall of a NACA 0012 airfoil subjected to sinusoidal oscillation. The Mach number was varied from M^o = 0.25 to M^o = 0.45 (corresponding to a Reynolds number variation of Re = 450,000 to Re = 810,000); the reduced frequency was varied from k = 0.025 to k = 0.10. Oscillation amplitudes of am = 5° and am = 10 were compared. Schlieren photographs are presented, which document the dynamic stall vortex formation, convection, and shedding sequence for various experimental conditions. Additionally, a preliminary examination of the flow reattachment process was conducted. Data derived from the photographs indicates that increasing the compressibility causes dynamic stall to occur at lower angles of attack; while, increasing the reduced frequency and/or the oscillation amplitude effectively delays dynamic stall effects to a higher angle of attack. Flow reattachment is sensitive to both Mach number and reduced frequency for low values of these parameters; when either the Mach number or reduced frequency is sufficiently high, the reattachment process stabilizes.en_US
dc.description.urihttp://archive.org/details/flowvisualizatio00bryd
dc.format.extent105 p.en_US
dc.language.isoen_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.titleFlow visualization of dynamic stall on an oscillating airfoilen_US
dc.typeThesisen_US
dc.contributor.secondreaderPlatzer, Max F.
dc.contributor.corporateNaval Postgraduate School
dc.contributor.schoolNaval Postgraduate School
dc.contributor.departmentAeronautical Engineering
dc.subject.authorDynamic Stallen_US
dc.subject.authorDynamic liften_US
dc.subject.authorUnsteady liften_US
dc.subject.authorHelicopter retreating blade stallen_US
dc.subject.authorOscillating airfoilen_US
dc.subject.authorFlow visualizationen_US
dc.subject.authorSchlieren methoden_US
dc.description.serviceCaptain, United States Armyen_US
etd.thesisdegree.nameM.S. in Aeronautical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineAeronautical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


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