The interaction of a low-aspect-ratio finite-span pin with a laminar flow over a flat plate was investigated experimentally. The pin was either static or dynamically oscillated in the wall-normal direction at a driving frequency that was either equivalent to the natural shedding frequency or its subharmonic. The mean height of the pin was either equal to 1 or 1.5 times the local boundary-layer thickness. The study focused on the formation and development of two main vortical structures: the arch-type vortex and the horseshoe vortex. It was shown that the arch vortex combined with the counter-rotating horseshoe vortex. The shedding of this coupled phenomenon was investigated under static and dynamic conditions to provide comparisons between their corresponding flowfield behaviors. Under dynamic conditions, the arch-type vortex periodically shed from the pin’s free end and advected downstream, interacting with the horseshoe vortex, which resulted in complex, three-dimensional, and time-periodic flow patterns. The dynamics of these flow structures were determined to be dependent upon the driving frequency and actuation amplitude.


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    Titel :

    Interactions of a Low-Aspect-Ratio Cantilevered Dynamic Pin with a Boundary Layer



    Erschienen in:

    Erscheinungsdatum :

    2017




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :

    Klassifikation :

    BKL:    55.50 Luftfahrzeugtechnik / 55.60 Raumfahrttechnik / 55.60 / 50.93 / 55.50 / 50.93 Weltraumforschung
    Lokalklassifikation TIB:    770/7040