Low Reynolds numbers and high turbulence intensities are inherent in the flight of small unmanned aerial vehicles (UAVs). A significant aspect of this unsteady motion is the pitching component of the flow, as perceived by the UAV, and the inherent risk of flow separation. The leading-edge suction parameter (LESP) has been proposed in the literature as a separation criterion. This paper trials the LESP in the erratic high-pitch-rate flow of onset turbulence. Two airfoils, a NACA0012 and NACA4412, have been tested at a Reynolds number of 100,000 and in turbulence intensities from 1.3 to 15%, replicating small UAV flight conditions. It is seen that, although the peaks in the LESP can indicate vortex shedding, the LESP in itself is not a sufficient criterion. Notably, there is not a critical value corresponding to vortex activity. Furthermore, the LESP does show sensitivity to camber, which is primarily apparent through the angle of the leading-edge suction vector.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Leading-Edge Suction Parameter in Turbulent Flow at a Low Reynolds Number


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 60 , 2 ; 798-808


    Erscheinungsdatum :

    2021-09-13


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Low-Reynolds Number Behavior of the Leading-Edge Suction Parameter at Low Pitch Rates

    Kay, Nicholas J. / Richards, Peter J. / Sharma, Rajnish N. | AIAA | 2021


    LOW REYNOLDS NUMBER BEHAVIOR OF THE LEADING-EDGE SUCTION PARAMETER AT LOW PITCH RATES

    Kay, Nicholas J. / Richards, Peter J. / Sharma, Rajnish N. | TIBKAT | 2021


    Low Reynolds Number Behavior of the Leading-Edge Suction Parameter at Low Pitch Rates

    Kay, Nicholas J. / Richards, Peter J. / Sharma, Rajnish N. | AIAA | 2021


    Suction Flow Control at High Reynolds Number

    Wallace, Ryan / Shea, Patrick / Glauser, Mark et al. | AIAA | 2011


    Theoretical Modeling of Leading Edge Vortices Using the Leading Edge Suction Parameter

    Ramesh, K.K. / Gopalarathnam, A. / Granlund, K. et al. | British Library Conference Proceedings | 2012