Q. In a Francis turbine, the runner blades are radial at the inlet and the discharge leaves the runner radially at the exit. For this turbine
Solution:
- Francis turbine is the bulk flow is in the radial direction.
- To be more clear, the flow is tangential and radial at the inlet but is entirely radial with a negligible tangential component at the outlet.
- The flow, under the situation, has to make a 90 degree turn after passing through the rotor for its inlet to the draft tube.
- Thus the absolute velocity is radial at the outlet.
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