The Steam Injector
A theoretical and practical treatise on the design and operation of injectors and on the flow of fluids through and the design of nozzles.
Forfatter: V. A. B. Hughes
År: 1912
Forlag: The Technical Publishing Company Limited
Sted: London
Sider: 145
UDK: 621.176
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104
THE STEAM INJECTOR.
steam nozzle and entering the vacuum formed in the com-
bining cone inay be approximately as great as if boiler
steam of considerable pressure were used, yet the weight or
quantity of steam passed through a given area will be less
in proportion to the inferior density of the exhaust steam.”
A typical exhaust steam injector is illustrated at fig.
59. The following is a detailed description'of the parts
of the appliance: —
The Steam Nozzle.—The ratio of cross-sectional areas of
steam inlet nozzle a and delivery nozzle throat adopted for
exhaust injectors is 16 to 1, as compared with. from between
2 and 3 to 1 in the case of ordinary live-steam injectors.
As the pressure of the entering steam is but small,
namely, that of the atmosphere, it is unnecessary to allow
for any transverse or lateral expansion in the steam nozzle
a. The latter is thei efore a plain cylindrical tube with
a rounded or smootli inlet edge.
The Oombining Nozzle.—The length of the combining
nozzle is usually not less than 15 times the diameter of
the delivery nozzle throat, so as to ensure satisfactory con-
densation of the large volume of steam dealt with.
The Delivery Nozzle of an exhaust injector is similar to
that employed in a live-steam injector.