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The rotating blade, vertical axis wind tur The rotating blade, vertical axis wind turbine KD 417

To propel the blades of a windmill, one can use the aerodynamic lift force or the aerodynamic drag force. The lift force L is the force (in N) which is generated on an airfoil perpendicular to the relative wind speed W. The drag force D is the force (in N) which is generated on a drag body in the direction of the relative wind speed W. The relative wind speed W is the wind speed (in m/s) which is felt by the airfoil or by the drag body. Modern horizontal axis wind turbines make use of the lift force and the blades move in a direction perpendicular to the undisturbed wind speed V (in m/s). Information about horizontal axis windmills can be found for instance in my report KD 35 (ref. 1).




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