An axial flow fan operates at 1200 rpm. The outer diameter of the impeller is Im and the hub diameter is 800 mm. At the mean blade radius, fluid enters at an angle al = 35 and the inlet blade angle is 30 and the outlet blade angle is 60, both the blade angles measured with respect to the plane of impeller rotation. Sketch the corresponding velocity diagrams at inlet and outlet and estimate from them (i) (ii) Horse power The rate of flow through the fan Outlet angle a2. (3 mks) (2 mks) (2 mks)