Wind Turbine Airfoils and Rotor Wakes - Wind Turbine Technology: Fundamental Concepts of Wind Turbine Engineering - page 380

blades of this rotor are Clark Y airfoils with an aspect ratio of six. Figure 6-3 shows the
modification of the unstalled two-dimensional lift and drag curves for this airfoil [Silverstein
1934] to represent an aspect ratio of six, in accordance with Equations (6-3). At the stall
angle of 15.9 deg, these curves are coupled with the Viterna-Corrigan model of post-stall
behavior. The power curves in Figure 6-4 show the effect of these changes on calculated
power, compared to test data from [Lundsager et al. 1980].
Figure 6-3. Two-dimensional and modified lift and drag curves for Clark Y airfoils.
Figure 6-4. Measured output power of the Gedser 200-kW wind turbine compared to
power curves calculated by two methods. [Viterna and Corrigan 1981]