A Francis turbine with an overall efficiency of $70 \%$ is required to produce 147.15 kW . it is working under a head of 8 m . The peripheral velocity $=0.30 \sqrt{2 g H}$ and the radial velocity of flow at inlet is $0.96 \sqrt{2 g H}$. The wheel runs at 200 rpm and the hydraulic losses in the turbine are $20 \%$ of the available energy. Assume radial discharge, determine: (c) Diameter of the wheel at inlet

Explanation

The diameter of the wheel at inlet is determined by the ratio of the peripheral velocity to the radial velocity of flow at inlet.