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.
Tip Vane Drag Measurements on the Full Scale Experimental Wind Turbine
1986
135 pages
Report
No indication
English
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