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Cross compound steam turbine arrangement
Compounding is the splitting up, into two or more stages, of the steam
pressure or velocity change through a turbine.
Pressure compounding of an impulse turbine is the use of a number
of stages of nozzle and blade to reduce progressively the steam pressure.
This results in lower or more acceptable steam flow speeds and a better
turbine efficiency.
Velocity compounding of an impulse turbine is the use of a single
nozzle with an arrangement of several moving blades on a single disc.
Between the moving blades are fitted guide blades which are connected
to the turbine casing. This arrangement produces a short lightweight
turbine with a poorer efficiency which would be acceptable in, for
example, an astern turbine.
