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
Whirl velocity at inlet is equal to that at the outlet
Axial velocity at inlet 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 accelerated circulation type boiler

Water is converted into steam in one pass without any recirculation
Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Feed pump is employed to supplement natural circulation in water wall type furnace

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