This paper presents an experimental investigation on the control of airfoil aerodynamics at poststall angle of attack a using a surface perturbation technique. Piezoceramic actuators were deployed to create a local surface perturbation on a NACA0012 airfoil, along with an open-loop control system, to manipulate flow around the airfoil. Two different control signals were examined, i.e., square and sine waves. Whereas the lift and drag forces were measured using a load cell, the flow was documented using a particle image velocimetry, laser Doppler anemometer and a single hotwire. The surface perturbation significantly improved the airfoil aerodynamics for 12 smaller alpha smaller 20 deg. The control effect with the square-wave excitation was found to be much more effective than that with the sine wave. The control was most effective at alpha = 14 deg: the mean lift coefficient, lift-to-drag ratio, and figure of merit (i.e., the ratio of the power to aerodynamic efficiencies) were enhanced by 35, 64, and 44%, respectively, whereas the mean drag coefficient dropped by 23%. Furthermore, the airfoil stall was postponed by 3 deg. The physics behind the observations were discussed in detail.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Control of poststall airfoil aerodynamics based on surface perturbation


    Additional title:

    Steuerung der Tragflügel-Aerodynamik nach dem Strömungsabriss basierend auf Oberflächenstörung


    Contributors:
    Zhang, M.M. (author) / Zhou, Y. (author) / Cheng, L. (author)

    Published in:

    AIAA Journal ; 46 , 10 ; 2510-2519


    Publication date :

    2008


    Size :

    10 Seiten, 14 Bilder, 1 Tabelle, 35 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English






    Poststall airfoil response to a periodic freestream

    HOWARD, RICHARD M. / GWILLIAM, DAVID J. | AIAA | 1991


    Poststall Airfoil Performance and Vertical-Axis Wind Turbines

    Rainbird, John / Peiro, Joaquim / Graham, J. Michael | AIAA | 2017


    Control of Poststall Airfoil Using Leading-Edge Pulsed Jets

    Hipp, Kyle D. / Walker, Michael M. / Benton, Stuart I. et al. | AIAA | 2017