Digby Symons - Blade

1
0.9
0.8
0.7
0.6
a, a' 0.5
0.4
0.3
0.2
0.1
0
0 2 4 6 8 10
Local speed ratio x = ωr
/V0
Fig. 20: Optimal induction factors
4.3 Dependency of Power on Tip Speed Ratio
Substitution of (19) and (20) into (17) provides the dependency of the
power coefficient C p on the tip speed ratio λ (Fig. 21).
27
C
16
p
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0 2 4 6 8
Tip speed ratio
λ =
ωR
V
Fig. 21: Turbine efficiency
0
a
a'
10
20