On the effect of discrete roughness on the growth of crossflow instability in very low turbulence environment

Placidi, M., van Bokhorst, E. & Atkin, C.J. (2016). On the effect of discrete roughness on the growth of crossflow instability in very low turbulence environment. In: 8th AIAA Flow Control Conference. . Reston, VA, United States: American Institute of Aeronautics and Astronautics. ISBN 9781624104329

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Abstract

Wind tunnel experiments were conducted in a low-turbulence environment (Tu < 0.006%) on the stability of 3D boundary layers. The effect of two different distributions of discrete roughness elements (DREs) on crossflow vortices disturbances and their growth was evaluated. As previously reported, DREs are found to be an effective tool in modulating the behaviour of crossflow modes. However, the effect of 24µm DREs was found to be weaker than previously thought, possibly due to the low level of environmental disturbances herewith. Preliminary results suggest that together with the height of the DREs and their spanwise spacing, their physical distribution across the surface also intimately affects the stability of 3D boundary layers. Finally, crossflow vortices are tracked along the chord of the model and their merging is captured. This phenomena is accompanied by a change in the critical wavelength of the dominant mode.

Item Type: Book Section
Additional Information: Copyright © 2016 by City University London. Published by the American Institute of Aeronautics and Astronautics, Inc.
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: School of Engineering & Mathematical Sciences > Engineering
URI: http://openaccess.city.ac.uk/id/eprint/16585

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