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Influence of the Shear Layer Thickness on the Flow Around Unsteady Airfoils

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New Results in Numerical and Experimental Fluid Mechanics X

Part of the book series: Notes on Numerical Fluid Mechanics and Multidisciplinary Design ((NNFM,volume 132))

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Abstract

Experiments with a pitching and plunging unsteady airfoil have been conducted in order to investigate the influence of the separating shear layer properties on the formation and detachment of leading edge vortices (LEVs). The chord length was varied from 90 to 180 mm keeping all non-dimensional parameters constant. It has been shown, that the mechanism of vortex detachment changes with chord length, manifested by a change in flow topology. One mechanism scales with chord length, the other is attributed to viscous effects in the boundary layer. For this mechanism a new scaling of the LEV circulation is introduced.

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Authors and Affiliations

  1. Institute of Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Flughafenstr. 19, 64347, Griesheim, Germany

    Alexander Widmann & Cameron Tropea

Authors
  1. Alexander Widmann
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  2. Cameron Tropea
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Correspondence to Alexander Widmann .

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Editors and Affiliations

  1. Ins. für Aerodynamik & Strömungstechnik, Deutsches Zentrum für Luft- und Raumfahr, Göttingen, Germany

    Andreas Dillmann

  2. Airbus Deutschland, Bremen, Bremen, Germany

    Gerd Heller

  3. Institut für Aerodynamik und Gasdynamik, Universität Stuttgart, Stuttgart, Germany

    Ewald Krämer

  4. Inst. für Aerodynamik & Strömungstechnik, Deutsches Zentrum für Luft- und Raumfahr, Göttingen, Niedersachsen, Germany

    Claus Wagner

  5. Technische Universität München, Lehrstuhl für Aerodynamik & Strömungsm, Garching, Bayern, Germany

    Christian Breitsamter

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Widmann, A., Tropea, C. (2016). Influence of the Shear Layer Thickness on the Flow Around Unsteady Airfoils. In: Dillmann, A., Heller, G., Krämer, E., Wagner, C., Breitsamter, C. (eds) New Results in Numerical and Experimental Fluid Mechanics X. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 132. Springer, Cham. https://doi.org/10.1007/978-3-319-27279-5_59

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  • DOI: https://doi.org/10.1007/978-3-319-27279-5_59

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-27278-8

  • Online ISBN: 978-3-319-27279-5

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