Page 212 - Wind Energy Handbook
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186 WIND-TURBINE PERFORMANCE
0.5
0.4
0.3
C
P
0.2
0.1
0
0 5 10 15
λ
Figure 4.14 C P – º Curve for a Design Tip Speed Ratio of 7
0.004
K
Pi
0.002
0
0 0.1 0.2 0.3 0.4 0.5 0.6
1
λ
i
Figure 4.15 K P –1=º Curve for a Fixed Speed, Stall-regulated Turbine
P s ¼ 500=0:9 þ 10 ¼ 567 kW
The wind speed at which maximum power is developed is 13 m=s, therefore the
3
rotor swept area must be, assuming an air density of 1:225 kg=m ,
3
3
567 000=(1=2 3 1:225 3 13 3 0:22) ¼ 1:92 3 10 m 2
The rotor radius is therefore 24:6m.
