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Effects of the Actuation on the Boundary Layer of an Airfoil at Reynolds Number Re = 60000

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Abstract

Synthetic (zero net mass flux) jets are an active flow control technique to manipulate the flow field in wall-bounded and free-shear flows. The present paper focuses on the role of the periodic actuation mechanisms on the boundary layer of a SD7003 airfoil at \(Re=U_{\infty } C/\nu =6\times 10^4\). Here, Reynolds number is defined in terms of the free-stream velocity \(U_{\infty }\) and the airfoil chord C. The actuation is applied near the leading edge of the airfoil and is periodic in time and in the spanwise direction. The actuation successfully eliminates the laminar bubble at \(AoA=4^{\circ }\), however, it does not produce an increase in the airfoil aerodynamic efficiency. At angles of attack larger than the point of maximum lift, the actuation eliminates the massive flow separation, the flow being attached to the airfoil surface in a significant part of the airfoil chord. As a consequence, airfoil aerodynamic efficiency increases by a 124% with a reduction of the drag coefficient about 46%. This kind of technique seems to be promising at delaying flow separation and its associated losses when the angle of attack increases beyond the maximum lift for the baseline case.

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Acknowledgements

This work has been partially financially supported by the Ministerio de Economía y Competitividad, Secretaría de Estado de Investigación, Desarrollo e Innovación, Spain (Ref. TRA2017-88508-R) and by European Union’s Horizon 2020 research and innovation programme (INFRAEDI-02-2018, EXCELLERAT—The European Centre Of Excellence For Engineering Applications H2020.). We also acknowledge Red Española de Surpercomputación (RES) for awarding us access to the MareNostrum IV machine based in Barcelona, Spain (Ref. FI-2018-2-0015 and FI-2018-3-0021).This work is also funded in part by the Coturb program of the European Research Council.

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  1. Universitat Politècnica de Catalunya (UPC), Colom 11, ESEIAAT, 08221, Terrassa, Spain

    Ivette Rodriguez

  2. Barcelona Supercomputing Center (BSC), Barcelona, Spain

    Oriol Lehmkuhl & Ricard Borrell

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  1. Ivette Rodriguez
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Correspondence to Oriol Lehmkuhl.

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Rodriguez, I., Lehmkuhl, O. & Borrell, R. Effects of the Actuation on the Boundary Layer of an Airfoil at Reynolds Number Re = 60000. Flow Turbulence Combust 105, 607–626 (2020). https://doi.org/10.1007/s10494-020-00160-y

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