Jul 13, 2009

Rateau Stage

1) On a Rateau stage, a thermal exansion takes place only in nozzles and static energy of steam is converted to kinetic energy (flow velocity of steam). This kinetic energy is changed to effective force in blades on the rotor by reducing absolute velocity and changing velocity angle.

2) There is no pressure difference at inlet and outlet of blades on the rotor, because thermal expansion is only in nozzles, it means no thrust force acting to turbine rotor disc.

Rateau stage

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