Turbulent drag reduction downstream of large-eddy breakup (LEBU) devices is analyzed from the viewpoint of low-Reynolds number airfoil aerodynamics. It is argued that the variability of results between different research labs is primarily due to low Reynolds number “phenomena” associated with unsteady separation/transition of the LEBU device boundary layer. LEBU drag reduction is shown to be an extremely sensitive function of device micro-geometry at the low Reynolds numbers of all current investigations, and by analogy with conventional low-Reynolds number airfoil testing, the conclusion is drawn that the full potential for LEBU drag reduction must be explored at chord Reynolds numbers of 300,000 and above.


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    Title :

    Large Eddy Breakup Devices as Low Reynolds Number Airfoils


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE Aerospace Technology Conference and Exposition ; 1986



    Publication date :

    1986-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English