Please explain the working of francis turbine? (Manish asked)
Francis Turbine is a water turbine developed by James B Francis and is mainly used for Electrical Power Production ranging from 10MW to 750 MW. It is usually placed at the bottom of a dam where there is large pressure difference between the water entry level and exit level. As the water moves through the runner, its spinning radius decreases, further acting on the runner. At the exit, water acts on cup-shaped runner features, leaving with no swirl and very little kinetic or potential energy. The turbine’s exit tube is shaped to help decelerate the water flow and recover the pressure.