An Experimental Study of Longitudinally Embedded Vortices in a Turbulent Boundary Layer via the Non-Invasive Comprehensive LDV Technique

dc.contributor.authorDerlaga, Joseph Michaelen
dc.contributor.committeechairSimpson, Roger L.en
dc.contributor.committeememberDevenport, William J.en
dc.contributor.committeememberRoy, Christopher J.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.description.abstractThis report documents the measurements of turbulence quantities resulting from vortices embedded in a zero pressure gradient turbulent boundary layer. Turbulent boundary layers are found in most flow regimes over large scale vehicles and have been studied for many years. Various systems to control separation of boundary layers have been proposed, but vortex generators have proven to be an economical choice as they are often used to fix deficiencies in a flow field after large scale production of a vehicle has commenced. In order to better understand the interaction between vortex generators and the boundary layer in which they are embedded, an experiment has been performed using through non-invasive Comprehensive Laser Doppler Velocimeter. The results show that normalization on edge velocity is appropriate for comparison with previous work. The 1/S parameter and vq^2 parameter were found to be most appropriate to correlate the Reynolds stresses and triple products, respectively. The higher inflow edge velocity and greater momentum thickness, creating a lower vortex generator to boundary layer height ratio, result in a more diffuse vortex as compared to previous work conducted in the same wind tunnel, with the same geometry, but with different inflow conditions.en
dc.description.degreeMaster of Scienceen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.subjectlaser Doppler velocimetryen
dc.subjectlaser Doppler anemometryen
dc.subjectboundary layersen
dc.subjectReynolds stressesen
dc.subjectnon-intrusive flow measurementen
dc.titleAn Experimental Study of Longitudinally Embedded Vortices in a Turbulent Boundary Layer via the Non-Invasive Comprehensive LDV Techniqueen
dc.typeThesisen and Ocean Engineeringen Polytechnic Institute and State Universityen of Scienceen


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