An inward flow reaction turbine works under a total head of 25 m. The outer and inner diameters of..

An inward flow reaction turbine works under a total head of
25 m. The outer and inner diameters of the runners are 0.70 m and 0.35 m
respectively. The vane tip is radial at the inlet and the flow leaves the
turbine radially. The guide vane angle is 12°. Calculate the speed of the
runner and the vane angle at exit, if the velocity of flow at the exit of the
draft tube is 4.0 m/s. Assume the velocity of flow to be constant and the
hydraulic efficiency to be 0.90.