The interaction between a streamwise vortex and a spanwise blade was studied in incompressible flow for blade-vortex separations between +-1/8 chord. Three-component velocity and turbulence measurements were made from 4 chord lengths upstream to 15 chord lengths downstream of the blade using miniature four-sensor hot-wire probes. The interaction of the vortex with the blade causes an almost immediate loss in vortex core circulation. Downstream of the blade the core becomes embedded in the blade wake and begins to grow rapidly. Core radius increases and peak tangential velocity decreases but circulation remains roughly constant. True turbulence levels within the core are much larger downstreams than upstream of the blade. Outside of the core the interaction produces a substantial region of turbulent flow associated with the blade and vortex generator wakes. Overall, perpendicular blade vortex interaction substantially alters the flow and produces a much larger and more intense region of turbulent flow than that presented by the undisturbed vortex. These results have significant implications for the prediction of both impulsive and broadband helicopter noise.


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    Titel :

    Perpendicular blade vortex interaction


    Weitere Titelangaben:

    Wechselwirkungen einer Wirbelfadenströmung und einem dazu senkrechten Flügel


    Beteiligte:
    Wittmer, K.S. (Autor:in) / Devenport, W.J. (Autor:in) / Rife, M.C. (Autor:in) / Glegg, S.A.L. (Autor:in)

    Erschienen in:

    AIAA Journal ; 33 , 9 ; 1667-1674


    Erscheinungsdatum :

    1995


    Format / Umfang :

    8 Seiten, 81 Bilder, 16 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





    Perpendicular Blade Vortex Interaction

    Wittmer, K. S. / Devenport, W. J. / Rife, M. C. et al. | British Library Conference Proceedings | 1994


    Perpendicular blade vortex interaction

    Wittmer, Kenneth S. / Devenport, William J. / Rife, Michael C. et al. | AIAA | 1995


    Perpendicular Blade Vortex Interaction

    Wittmer, K.S. | Online Contents | 1995


    Perpendicular Blade Vortex Interaction

    Wittmer, K. S. / Devenport, W. J. / Rife, M. C. et al. | British Library Conference Proceedings | 1994