Drag on 3 sets of tip vanes incorporating an LA 5055 and NACA 23012 airfoil section was measured. The drag level of the tip vane is high due to a high level of induced drag. There is no significant difference between the drag of the LA and the NACA airfoil. In oversynchronous operation the measured drag is a little lower than in undersynchronous operation. Calculations show that the measured drag level only can be explained by summing the calculated induced drag, the two-dimensional airfoil drag and interference drag (of same order as the two-dimensional airfoil drag) and neglecting any self propelling effect of the tip vanes. A self propelling effect might be expected when the tilt angle of the tip vane is too big in relation to the axial flow expansion.


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    Title :

    Tip Vane Drag Measurements on the Full Scale Experimental Wind Turbine


    Contributors:
    A. Bruining (author)

    Publication date :

    1986


    Size :

    135 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English