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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12
THE STEAM INJECTOR.
To obtain the best results, the inlet edge of the steam
nozzle should be slightly rounded, so as to obviate the
setting up of eddy motions at the nozzle throat. If the
inlet edge is excessively rounded, there is probably a cliok-
ing action in the nozzle resulting in velocity loss. In
Rosenhain’s experiments before referred to, the be-st results
were given by nozzles having only slightly rounded inlet
edges.
Figs. 8 to 11 illustrate various forms of steam nozzle as
used in live steam injectors. There would appear to be no
necessity for the excessive length and convergence of the
inlet end of some of the steam nozzles employed in in-
jectors* (except it be that a hexagon is required on the
nozzle exteriör). Fig. 12 shows the form of nozzle which
gave the best all-round results in Rosenhain’s experiments.
The velocity of discharge of the steam from the exit
* A nozzle having a well-rounded inlet discharges more steam in a given time
than a nozzle ha ving only a slightly-rounded inlet, and likewise a nozzle having:
the latter form of iulet discharges more steam than one ha ving a Sharp inlet.