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Similar tests were also made on the 25-kW Carter Model 25 HAWT [Gyatt 1986]. In
this rotor the blades are highly twisted, so at low wind speeds the angles of attack along the
inboard segments of the blade are well below stall. Thus, while vortex generators increased
the maximum power of the Carter Model 25, power output at low wind speeds was reduced
by the additional drag of the vortex generators.
Figure 5-25. Test power curves for the 2.5-MW Mod-2 HAWT with and without
vortex generators on the rotor airfoils.
[Sullivan 1984]
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