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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THE STEAM INJECTOB.
26
The pressure at the nozzle throat will be '58 of tho initial
pressure, or 58 Ibs. per square inch absolute. The velocity
of the jet at the throat and at the nozzle mouth after full
expansion can be calculated by formula (xi.) and the dry-
ness fractions by formula (vii.). We then get
Am _ 1553 x 330-36 x ‘7894
At ~ 3918 X 7-25 X -9649
= 147 approximately.
The above calculations are somewhat laborious. The
following formula, by Zeuner, gives sufficiently correct
results for practical purposes : —
A“ __ l;,;' - ... (xix.)
a< /(?.yTO_ fe)1”
V 'pp 'Pi
where Am = area of nozzle mouth.
At = area of nozzle throat,
p1 = boiler pressure (absolute),
p2 — exhaust pressure (absolute).