A fan (see Fig. P5.58) has a bladed rotor of 12-in. outside diameter and 5-in. inside di...

A fan (see Fig. P5.58) has a bladed rotor of 12-in. outside diameter and 5-in. inside diameter and runs at 1725 rpm. The width of each rotor blade is 1 in. from blade inlet to outlet. The volume flowrate is steady at 230 ft³/min, and the absolute velocity of the air at blade inlet, V₁, is purely radial. The blade discharge angle is 30 measured with respect to the tangential direction at the outside diameter of the rotor. (a) What would be a reasonable blade inlet angle (measured with respect to the tangential direction at the inside diameter of the rotor)? (b) Find the power required to run the fan.