Optical-velocimetry, wake measurements of lift and induced drag on a wing

I. Grant, G. McCutcheon, A. H. McColgan, D. Hurst

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)


    Particle Tracking Velocimetry was used, in a low-speed wind-tunnel study, to obtain simultaneous cross-flow velocity measurements in three planar regions downstream of an airfoil having a NACA 0015 profile. In order to measure both the total lift and induced drag, and their distributions on the airfoil, a wake integration technique based on the control volume approach was used. The airfoil model was tested in clean wing configuration and with a 3.33% Gurney flap attached to the trailing edge. The Gurney flap was found to increase the complexity of the wake and cause a systematic increase in lift and induced drag values. The changes in total lift and induced drag resulting from the fitting of a Gurney flap compared very favourably to investigations using traditional aerodynamic techniques demonstrating the validity of the method. © 2005 Elsevier Ltd. All rights reserved.

    Original languageEnglish
    Pages (from-to)282-303
    Number of pages22
    JournalOptics and Lasers in Engineering
    Issue number3-4
    Publication statusPublished - Mar 2006


    • Gurney flap
    • Induced drag
    • Lift
    • Particle tracking velocimetry (PTV)
    • PIV
    • Wake integration
    • Wake studies


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