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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    Title :

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


    Additional title:

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


    Contributors:

    Published in:

    AIAA Journal ; 41 , 7 ; 1230-1237


    Publication date :

    2003


    Size :

    8 Seiten, 10 Bilder, 32 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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