The results of experiments in which a unsteady flow was generated on the surface of an airfoil immersed in an incompressible freestream are discussed. Measurements of the velocity and vorticity fields and the surface pressure distribution generated by oscillations of a fence-type spoiler located on one surface of the airfoil has confirmed the presence of a dynamically evolving vortex-like structure bearing a close resemblance to the one encountered in classical dynamic stall. The growth and development of the shear layer region is characterized through iso-vorticity contour maps at select phase points during the motion cycle. A detailed description of flow field behaviour is provided over a range of dimensionless spoiler frequencies and freestream Reynolds numbers. The correlation of these results with corresponding surface pressure measurements is also presented. (Kursetz)


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    Title :

    An investigation of unsteady flow separation


    Additional title:

    Eine Untersuchung zur Trennung bei ungleichmaessigen Stroemungen


    Contributors:
    Francis, M.S. (author) / Keesee, J.E. (author) / Retelle, J.P. (author) / Sisson, G.E. (author) / Lang, J.D. (author)

    Published in:

    Publication date :

    1980


    Size :

    91 Seiten


    Type of media :

    Report


    Type of material :

    Print


    Language :

    English






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