All About Engines
Forfatter: Edward Cressy
År: 1918
Forlag: Cassell and Company, LTD
Sted: London, New York, Toronto and Melbourne
Sider: 352
UDK: 621 1
With a coloured Frontispiece, and 182 halftone Illustrations and Diagrams.
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Fig. 91.—Small Westinghouse-Rateau turbine
Steam Turbines 159
the relation between the fall in pressure and the shape
of the fixed blades the total velocity obtainable from
the steam may be split up into a series of stages, and
the velocity which is characteristic of the single
wheel of de Laval’s turbine is reduced accordingly.
Turbines with more than one stage can be used
to drive ^electric generators and other machinery
directly,
without the
intervention
of toothed
gearing.
With these
preliminary
explanations
the general
arrangement,
method of
working, and
construction
of an impulse
turbine will
be clear from
the following
plates and diagrams. Fig. gi shows a section through
a small Westinghouse-Rateau turbine with a single
velocity wheel having three rings of blades, and
made in sizes from about 40 to 300 horse-power.
Fig. 92 is a half-section through a larger high-
pressure turbine having one velocity wheel, A, with two
rows of blades, and six velocity wheels, B, carrying a
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