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On the effect of active flow control on the meandering of a wing-tip vortex

Published online by Cambridge University Press:  08 June 2020

Marouen Dghim Open the ORCID record for Marouen Dghim [Opens in a new window] ,
Mohsen Ferchichi  and
Hachimi Fellouah
Marouen Dghim*
Affiliation:
Department of Mechanical Engineering, Université de Sherbrooke, 2500 boulevard de l’Université, Sherbrooke, QC, J1K 2R1, Canada Department of Mechanical and Aerospace Engineering, Royal Military College of Canada, 713 General Crerar Crescent, Kingston, ON, K7K 7B4, Canada
Mohsen Ferchichi
Affiliation:
Department of Mechanical and Aerospace Engineering, Royal Military College of Canada, 713 General Crerar Crescent, Kingston, ON, K7K 7B4, Canada
Hachimi Fellouah
Affiliation:
Department of Mechanical Engineering, Université de Sherbrooke, 2500 boulevard de l’Université, Sherbrooke, QC, J1K 2R1, Canada
*
†Email address for correspondence: [email protected]
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Abstract

The development of a wing-tip vortex of a rectangular, square-tipped wing having a NACA 0012 airfoil at a chord Reynolds number $Re_{c_{w}}=2\times 10^{5}$, under the effect of synthetic jet actuation, was experimentally studied. Five control configurations were considered: case C1 with momentum coefficient $C_{\unicode[STIX]{x1D707}}=0.001$ and actuation frequency $F^{+}=0.075$; case C2 with $C_{\unicode[STIX]{x1D707}}=0.001$ and $F^{+}=0.15$; case C3 with $C_{\unicode[STIX]{x1D707}}=0.001$ and $F^{+}=0.3$; case C4 with $C_{\unicode[STIX]{x1D707}}=0.001$ and $F^{+}=0.6$; and case C5 with $C_{\unicode[STIX]{x1D707}}=0.001$ and $F^{+}=1.2$. Under the most effective configuration, case C3, the vortex was stretched and appeared to be diffuse with a nearly 40 % decrease in the peak circumferential velocity and 50 % decrease in the core axial vorticity. The vortex core radius largely broadened suggesting that the lower-frequency control configuration allowed the synthetic jet to travel larger distances into the vortex bringing turbulent structures within its core resulting in increased mixing and subsequently a more diffuse vortex.

JFM classification

Flow Control: Flow Control Turbulent Flows: Turbulent Flows Vortex Flows: Vortex Flows
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 896 , 10 August 2020 , A30
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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