Blade Element Calculations - Small Wind Turbines: Analysis, Design, and Application - page 89

Fig. 5.3 Predicted velocity
through the rotor for the
measurements of Anderson
et al. [ 5 ]

0.8

0.75

0.7

0.65

= 8
= 10
= 12

0.6

0.55

0 0.2 0.4 0.6 0.8 1

radius, r/R

Fig. 5.4 Predicted blade
circulation for the
measurements of Anderson
et al. [ 5 ]

0.28

0.26

0.24

0.22

= 8
= 10
= 12

0.2

0.18

0.16

0 0.2 0.4 0.6 0.8 1

radius, r/R

Fig. 5.5 Predicted
distribution of blade torque
for the measurements of
Anderson et al. [ 5 ]

5

4

λ

= 8

= 10

λ

= 12 λ

3

2

1

0

0 0.2 0.4 0.6 0.8 1

radius, r/R

thrust. Unfortunately the maximum measured value of C T in Fig. 5.2 b is just over
unity, so it was not possible to explore the accuracy of the calculations in the high
thrust region; there just does not appear to be any good data for these conditions.