Interaction of a dynamic vortex generator with a laminar boundary layer

Cruz, Erica Jeannette
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Oehlschlaeger, Matthew A.
Sahni, Onkar
Hicken, Jason
Issue Date
Aeronautical engineering
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Surface oil flow visualization experiments were performed to obtain qualitative information on the structures present in the flow, while Stereoscopic particle image velocimetry (SPIV) was used to provide quantitative measurements of the 3-D flow field at multiple spanwise planes downstream of the VG under both static and dynamic conditions. Several flow features were detected in the oil flow visualization experiments, including two vortical structures—the main vortex and primary horseshoe vortex—which were confirmed in the SPIV results. The time-averaged flow field showed similar results, though the strength of the vortices appeared less when the VG was actuated. However, phase-averaged data revealed the size, strength, and location of the vortices varied as a function of the actuation cycle, with peaks of vorticity magnitude being greater at certain phases as compared to the static case. The varying flow field associated with the dynamic motion of the DVG showed higher levels of turbulent kinetic energy, therefore confirming enhanced mixing in contrast to the static case.
August 2015
School of Engineering
Dept. of Mechanical, Aerospace, and Nuclear Engineering
Rensselaer Polytechnic Institute, Troy, NY
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