Slotted multi-element configurations are widely used because they are very effective in increasing the maximum lift of airfoils during takeoff and landing. However, when stall occurs in the leading-edge region of one of the elements, the outcome is a sudden and dangerous drop in performance of the whole configuration. The results of the experimental verification of a computer-designed single-slotted flap are presented. Many realistic configurations, including the computed optimum, were tested and compared to the numerical predictions. For a number of these configurations, sudden leading-edge stall due to the bursting of a laminar bubble was detected on the flap, followed by severe stall hysteresis. Present numerical design codes do not help the designer much in predicting this important phenomenon, and wind-tunnel testing remains necessary. Therefore, there is a need for better bubble bursting prediction methods. A possible direction for improvement is discussed, focusing on the unsteadiness of the flow.


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    Titel :

    Bubble bursting and stall hysteresis on single-slotted flap high-lift configuration


    Weitere Titelangaben:

    Untersuchung der Strömungsablösung und des Auftriebsbeiwerts eines Spaltflügels in Abhängigkeit vom Anstellwinkel


    Beteiligte:
    Baragona, M. (Autor:in) / Boermans, L.M.M. (Autor:in) / Tooren, M.J.L. van (Autor:in) / Bijl, H. (Autor:in) / Beukers, A. (Autor:in)

    Erschienen in:

    AIAA Journal ; 41 , 7 ; 1230-1237


    Erscheinungsdatum :

    2003


    Format / Umfang :

    8 Seiten, 10 Bilder, 32 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Bubble Bursting and Stall Hysteresis on Single-Slotted Flap High-Lift Configuration

    M. Baragona / L. M. M. Boermans / M. J. L. van Tooren et al. | AIAA | 2003



    Stall Hysteresis of an Airfoil with Slotted Flap

    Biber, K. | Online Contents | 2005


    STALL HYSTERESIS OF AN AIRFOIL WITH SLOTTED FLAP

    Biber, K. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2005