A generator driven by a wind turbine is required to deliver 2 MW of power at the generator terminals. The turbine is a two-blade propeller rotating about a horizontal axis and the maximum permitted...

B2

Extracted text: A generator driven by a wind turbine is required to deliver 2 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 55×106 N/m² The rotor is designed to operate at a rotational speed of 55 revolution per seconds .The stage efficiencies are Cp = 0.32, ngb = 0.90, ng = 0.92. . (i) If the turbine delivers its rated power at a wind average speed of 29 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 =