Aerodynamics and Design of Horizontal-Axis Wind Turbines
The upper part of Fig. 9.2 shows the rotor seen from the front and the lower part displays the unfolded cut in the rotor plane at the radial position, r, indicated by the dashed line and seen directly from above.The first thing to note in the lower part of Fig. 9.2 is that the wind speed approaching the rotor has been reduced by a factor a·V o, so that …
