The hydraulic efficiency of a turbine is the ratio of
1
mechanical energy in the input shaft at coupling and hydrodynamic energy available from the fluid.
2
mechanical energy supplied by the rotor and hydrodynamic energy available from the fluid
3
useful hydrodynamic energy in the fluid at final discharge and mechanical energy supplied to the rotor
4
useful hydrodynamic energy in the fluid at final discharge and mechanical energy supplied to the shaft and coupling