The 'bursting' of leading edge laminar separation bubbles that can occur on moderately thick airfoil sections are the cause of sudden large increase of drag, decrease of lift and change in pitching moment associated with abrupt stall at high angles of attack. This paper describes a semi-empirical theory for the description and calculation of the development and bursting of laminar separation bubbles. The semi-empirical theory uses an experimental correlation to relate the length of the laminar free shear layer to the free stream turbulence and a modified version of Hortons Method 1 to calculate the properties and reatachment position of the turbulent shear layer. The method is used to predict the development of laminar separation bubbles for NACA airfoils. Comparison of these results with NACA experiment shows good agreement. (Kursetz)


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    Title :

    Calculation of laminar separation bubbles and their effect on airfoil performance


    Additional title:

    Kalkulation von laminaren Stroemungstrennblasen und ihrer Auswirkung auf das Verhalten von Tragfluegeln


    Contributors:

    Published in:

    AIAA-Papers ; Jan ; 1-8


    Publication date :

    1979


    Size :

    8 Seiten, 9 Bilder, 13 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English