MARC Steam Turbines The Modular Steam Turbine Generation

Reaction Part
The multi-stage reaction blading ensures
utmost reliability and economy due to
high mechanical and thermal
strengthen both guide blades and
rotor blades to withstand operating
stress
a large sectional modulus to avoid
vibrations.
low flow losses in the blading covering
a wide operating range.
The guide and rotor blades have the
same profile. It was theoretically and
experimentally tested during its development.
Hereby, the characteristics of
the profile, depending on the cascade
arrangement and the entry angles, were
determined by measurements in a plane
wind tunnel.
A characteristic feature of partload operation
is the entry angle deviating from
the normal line of flow. The impact-free
entry angle range is very large and ensures
a high part load efficiency at operating
conditions different from those of
rated load.
The clearance and rim losses of backpressure
turbines and high-pressure
parts of condensing turbines are reduced
to a minimum by using shrouds.
The blade with root and shroud is
machined from one piece. After blading
the rotor, the shrouding is machined to
its form. Regarding stages with a low
clearance loss factor, the blade tips are
provided with a one-sided thinning.
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