Wings flying at low Reynolds numbers enter a stalled flow regime by laminar boundary layer separation at the leading edge. A way to improve the flying performance of these wings at the angle of attack close to stalling is by forcing the transition of the upper-side wing boundary layer from laminar flow to turbulent flow. To force such a transition several devices can be used, the simplest one being a wire parallel to the wing leading edge. The efficiency of such a turbulence generator has been checked by testing two wing models in a low turbulence wind tunnel. One of the wings is of elliptic planform and is equipped with a leading edge wire placed along 62 per cent of the wing span. The second model simulates the wing of the very primitive bird Archaeopteryx, and it is also equipped with a wire at the leading edge which simulates one of the long fingers emerging from the leading edge of the wings of this bird. In both cases, experimental results show that these leading-edge devices are effective in delaying wing stall.


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    Title :

    Use of turbulence generators as stall-delaying devices in flight at low Reynolds numbers


    Additional title:

    Einsatz von Wirbelgeneratoren zur Strömungsabrißverzögerung beim Flug mit niedrigen Reynoldszahlen


    Contributors:
    Meseguer, J. (author) / Sanz-Andres, A. (author) / Perez-Grande, I. (author) / Franchini, S. (author) / Sanz, J.L. (author) / Ortega, F. (author) / Chiappe, L. (author)


    Publication date :

    2008


    Size :

    7 Seiten, 9 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





    Use of turbulence generators as stall-delaying devices in flight at low Reynolds numbers

    Meseguer, J / Sanz-Andrés, A / Pérez-Grande, I et al. | SAGE Publications | 2008


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    Post Stall Propeller Behavior at Low Reynolds Numbers

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