A generator driven by a wind turbine is required to deliver 12 MW of power at the generator terminals. The turbine is a two-blade propeller rotating about a horizontal axis and the maximum permitted...

Extracted text: A generator driven by a wind turbine is required to deliver 12 MW of power at the generator terminals. The turbine is a two-blade propeller rotating about a horizontal axis and the maximum permitted shear stress of the turbine shaft is 55x10€ N/m? The rotor is designed to operate at a rotational speed of 70 revolution per seconds .The stage efficiencies are Cp = 0.32, ngb = 0.90, ng = 0.92.. () If the turbine delivers its rated power at a wind average speed of 20 m/s, calculate the corresponding diameter of the propeller and its TSR, assuming a typical value for the overall efficiency. The air density may be assumed to have a value 1.29 kg/m³. (ii) Calculate the torque on the turbine shaft. Area = Radius= Tip speed ratio = shaft torque