Steam Boilers, Engines, Nozzles and Turbines
The purpose of governing in steam turbines is to

Reheat the steam and improve its quality
Reduce the effective heat drop
Completely balance against end thrust
Maintain the speed of the turbine

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Steam Boilers, Engines, Nozzles and Turbines
In an ideal impulse turbine, the

Absolute velocity at the inlet of moving blade is equal to that at the outlet
Relative velocity at the inlet of the moving blade is equal to that at the outlet
Axial velocity at inlet is equal to that at the outlet
Whirl velocity at inlet is equal to that at the outlet

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