a) A large wind turbine has blades 50 m long. In Northern UAE's winds of 20 m/s, calculate

the rotational rate if the blade tips were to equal the speed of sound (340 m/s).

b)What would be the tip speed ratio if hurricane-force wind of 40 m/s blows over the hills?

Compare your results with the figure below and identify which turbine would best

work under this condition?

Cp Ideal wind rotor 0.6 0.5 Mul-blade wind rotor 0.4 Three-blade wind rotor Two-blade wind rotor 0.3 0.2 mi . 0.1 0 Dutch four armed wind rotor 1 2 3 4 5 6 7 8 8 9 10 11 12 13 14 Tip speed ratio 1