The wake turbulence structure of a cambered airfoil is studied experimentally, including the effects of surface roughness, at different freestream turbulence levels in a transonic flow. As the level of surface roughness increases, all wake profile quantities broaden significantly and nondimensional vortex shedding frequencies decrease. Freestream turbulence has little effect on the wake velocity profiles, turbulence structure, and vortex shedding frequency, especially downstream of airfoils with rough surfaces. Compared with data from a symmetric airfoil, wake profiles produced by the cambered airfoils also have significant dependence on surface roughness, but are less sensitive to variations of freestream turbulence intensity. The cambered airfoil also produces larger streamwise velocity deficits, and broader wakes compared to the symmetric airfoil.


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    Title :

    Wake turbulence structure downstream of a cambered airfoil in transonic flow: Effects of surface roughness and freestream turbulence intensity


    Additional title:

    Turbulentes Strömungsverhalten hinter gewölbten Tragflächen bei transsonischer Strömung: Einflüsse von Oberflächenrauigkeit und Freistromturbulenzgrad


    Contributors:


    Publication date :

    2006


    Size :

    12 Seiten, 11 Bilder, 26 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English