Rotor Blade Design, Number of Blades, Performance …
The system of Eqs. 10 and 11 can be solved analytically for the optimum axial induction. Depending on the actual value for the tip speed ration λ, the radial distribution of this optimum α will be as shown in Fig. 2.The value is very close to (alpha =frac {1}{3}) for most of the blade, only changing near the root, where the local tip …