Question

2. The discharge through a Francis turbine rotating at 150 rpm is 1.5 m3s-1. The outer and inner diameters of the turbine runner are 1500 mm and 1000 mm respectively. The runner thicknesses at entry and exit are 100 mm and 250 mm respectively. The power transfer to the runner is 150 kW. There is no shock at the inlet and outlet of the runner. Assume no whirl at outlet.

a) Find the whirl velocity at inlet.
b) What is the angle of the guide vanes?
c) Find the ideal entry and exit blade angles assuming no shock.