Page 116 - Wind Energy Handbook

90 AERODYNAMICS OF HORIZONTAL-AXIS WIND TURBINES

1
Blade geomerty parameter 0.5

0
0 1 2 3 4 5 6
Local speed ratio
With tip-loss
Without tip-loss

Figure 3.37 Variation of Blade Geometry Parameter with Local Speed Ratio, with and
without Tip-loss for a Three-blade Rotor with a Design Tip Speed Ratio of 6

Similarly, the inflow angle distribution, shown in Figure 3.38, can be determined
by suitably modifying Equation (3.66)
a
1
f
tan ö ¼ 2 a 3 (3:86)
6 a 1 7
4 f 5
ºì 1 þ
2 2
º ì f

40

30
Inflow angle 20

10

0
0 1 2 3 4 5 6
Local speed ratio
With tip-loss
Without tip-loss
Figure 3.38 Variation of Inflow Angle with Local-Speed Ratio, with and without Tip-loss
for a Three-blade Rotor with a Design Tip Speed Ratio of 6