The use of flat-plate tabs (similar to Gurney flaps) to enhance the lift of multielement airfoils is extended here by placing them on the pressure side and near the trailing edge of the main element rather than just on the furthest downstream wing element. The tabs studied range in height from 0.125 to 1.25% of the airfoil reference chord. In practice, such tabs would be retracted when the high-lift system is stowed. The effectiveness of the concept was demonstrated experimentally and computationally on a two-dimensional NACA 63(sub 2)-215 Mod B airfoil with a single-slotted, 30%-chord flap. Both the experiments and computations showed that the tabs significantly increase the lift at a given angle of attack and the maximum lift coefficient of the airfoil. The computational results showed that the increased lift was a result of additional turning of the flow by the tab that reduced or eliminated now separation on the flap. The best configuration tested, a 0.5%-chord tab placed 0.5% chord upstream of the trailing edge of the main element, increased the maximum lift coefficient of the airfoil by 12% and the maximum lift-to-drag ratio by 40%.


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    Title :

    Lift-Enhancing Tabs on Multielement Airfoils


    Contributors:

    Conference:

    Applied Aerodynamics ; 1993 ; Monterey, CA, United States


    Published in:

    Publication date :

    1995-05-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Lift-Enhancing Tabs on Multielement Airfoils

    J. C. Ross / B. L. Storms / P. G. Carrannanto | NTIS | 1995


    Lift-Enhancing Tabs on Multielement Airfoils

    Ross, J.C. | Online Contents | 1995


    Lift-enhancing tabs on multielement airfoils

    Ross, James C. / Storms, Bruce L. / Carrannanto, Paul G. | AIAA | 1995


    Lift enhancing tabs for airfoils

    Ross, James C. | NTRS | 1994


    Lift-Enhancing Tabs on Multi-Element Airfoils

    Ross, J. C. / Storms, B. L. / Carrannanto, P. G. et al. | British Library Conference Proceedings | 1993