For a given Francis turbine, 1 = 60, 2 = 90, r1 = 5 m,

For a given Francis turbine, β₁ = 60°, β₂ = 90°, r1 = 5 m, r₂ = 3 m, and B = 1 m. Th e discharge is 126 m³/s, and the rotational speed is 60 rpm. Assume T = 10°C.

a. What should α1 be for a non separating flow condition at the entrance to the runner?

b. What is the maximum attainable power with the conditions noted?

c. If you were to redesign the turbine blades of the runner, what changes would you suggest to increase the power production if the discharge and overall dimensions are to be kept the same?