Experiments in a water tunnel have been carried out on low-aspect-ratio rectangular wings undergoing a small-amplitude harmonic plunge motion at Reynolds numbers 10,000 and 20,000. A series of measurement techniques have been used, including force measurements, hot film, particle image velocimetry, and volumetric velocimetry measurements, to study the lift enhancement as a function of forcing frequency. Multiple peaks in the time-averaged lift have been observed, occurring at frequencies in the order of natural vortex-shedding frequencies of the stationary wings. It is postulated that interaction between the leading-edge and trailing-edge vortices contributes to the selection of the optimal frequencies for the time-averaged lift. At a specific Strouhal number, an adverse interaction between the vortices results in a vortex dipole that directs flow upstream. A comparison between a NACA 0012 and flat-plate profile provides further insight into the advantages and disadvantages of using a thinner profile in low-Reynolds-number flows.


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    Titel :

    Lift-Enhancing Vortex Flows Generated by Plunging Rectangular Wings with Small Amplitude


    Beteiligte:
    Calderon, D. E. (Autor:in) / Wang, Z. (Autor:in) / Gursul, I. (Autor:in)

    Erschienen in:

    AIAA Journal ; 51 , 12 ; 2953-2964


    Erscheinungsdatum :

    2013-10-14


    Format / Umfang :

    12 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





    LIFT ENHANCEMENT OF A RECTANGULAR WING UNDERGOING A SMALL AMPLITUDE PLUNGING MOTION

    Colderon, D. / Wang, Z. / Gursul, I. et al. | British Library Conference Proceedings | 2010


    Lift Enhancement of a Rectangular Wing Undergoing a Small Amplitude Plunging Motion

    Calderon, Dario / Wang, Zhijin / Gursul, Ismet | AIAA | 2010


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    Son, Onur / Wang, Zhijin / Gursul, Ismet | AIAA | 2022