Calculate the input power to the impeller.

An impeller with an eye radius of 51 mm and an outside diameter of 406 mm rotates at 900 rpm. The inlet and outlet blade angles measured from the radial flow direction are 75° and 83° respectively, while the blade depth is 64 mm. Assuming zero inlet whirl, zero slip and an hydraulic efficiency of 89 per cent, calculate

(a)the volume flow rate through the impeller,

(b)the stagnation and static pressure rise across the impeller,

(c)the power transferred to the fluid and

(d)the input power to the impeller.