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

Placidi, Marco, van Bokhorst, Evelien and Atkin, Chris J. ORCID: https://orcid.org/0000-0003-2529-1978 (2016) On the effect of discrete roughness on the growth of crossflow instability in very low turbulence environment. In: 8th AIAA Flow Control Conference. 8th AIAA Flow Control Conference . American Institute of Aeronautics and Astronautics Inc. (AIAA), USA. ISBN 9781624104329

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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: Funding Information: The authors are grateful to Innovative UK and Airbus for supporting this research under the Advanced Laminar Flow Enabling Technique (ALFET) Project. We also acknowledge the support from the NWTF for some of the tunnel instrumentations under the EPSRC Grant Ref. EP/L024888/1.
Uncontrolled Keywords: fluid flow and transfer processes,control and systems engineering,aerospace engineering ,/dk/atira/pure/subjectarea/asjc/1500/1507
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Depositing User: LivePure Connector
Date Deposited: 19 Jul 2022 19:30
Last Modified: 22 Oct 2022 23:57
URI: https://ueaeprints.uea.ac.uk/id/eprint/86667

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