TY - GEN
T1 - On the effect of discrete roughness on the growth of crossflow instability in very low turbulence environment
AU - Placidi, Marco
AU - van Bokhorst, Evelien
AU - Atkin, Chris J.
N1 - 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.
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84980027692&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84980027692
SN - 9781624104329
T3 - 8th AIAA Flow Control Conference
BT - 8th AIAA Flow Control Conference
PB - American Institute of Aeronautics and Astronautics Inc. (AIAA)
T2 - 8th AIAA Flow Control Conference, 2016
Y2 - 13 June 2016 through 17 June 2016
ER -