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Passive control of the flow around unsteady aerofoils using a self-activated deployable flap
KTH, School of Engineering Sciences (SCI), Mechanics. City University London, United Kingdom.ORCID iD: 0000-0002-9004-2292
2018 (English)In: Journal of turbulence, ISSN 1468-5248, E-ISSN 1468-5248, Vol. 19, no 3, p. 204-228Article in journal (Refereed) Published
Abstract [en]

Self-activated feathers are used by many birds to adapt their wing characteristics to the sudden change of flight incidence angle. In particular, dorsal feathers are believed to pop-up as a consequence of unsteady flow separation and to interact with the flow to palliate the sudden stall breakdown typical of dynamic stall. Inspired by the adaptive character of birds feathers, some authors have envisaged the potential benefits of using of flexible flaps mounted on aerodynamic surfaces to counteract the negative aerodynamic effects associated with dynamic stall. This contribution explores more in depth the physical mechanisms that play a role in the modification of the unsteady flow field generated by a NACA0020 aerofoil equipped with an elastically mounted flap undergoing a specific ramp-up manoeuvre. We discuss the design of flaps that limit the severity of the dynamic stall breakdown by increasing the value of the lift overshoot also smoothing its abrupt decay in time. A detailed analysis on the modification of the turbulent and unsteady vorticity field due to the flap flow interaction during the ramp-up motion is also provided to explain the more benign aerodynamic response obtained when the flap is in use.

Place, publisher, year, edition, pages
Taylor & Francis, 2018. Vol. 19, no 3, p. 204-228
Keywords [en]
Large-Eddy Simulation, Low Reynolds-Numbers, 3-Dimensional Dunes, Coherent Structures, Upper-Surface, Stall Control, Separation, Wings, Airfoil, Steady
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-223291DOI: 10.1080/14685248.2017.1314486ISI: 000424062000003Scopus ID: 2-s2.0-85017409954OAI: oai:DiVA.org:kth-223291DiVA, id: diva2:1183705
Note

QC 20180219

Available from: 2018-02-19 Created: 2018-02-19 Last updated: 2018-02-19Bibliographically approved

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Output format
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