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

Whirl velocity at inlet is equal to that at the outlet
Axial velocity at inlet is equal to that at the outlet
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

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

The steam is expanded in nozzles only and there is a pressure drop and heat drop
The pressure and temperature of steam remains constant
The steam is expanded in moving blades only
The steam is expanded both in fixed and moving blades continuously

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