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
Søgning i bogen
Den bedste måde at søge i bogen er ved at downloade PDF'en og søge i den.
Derved får du fremhævet ordene visuelt direkte på billedet af siden.
Digitaliseret bog
Bogens tekst er maskinlæst, så der kan være en del fejl og mangler.
22
THE STEAM INJECTOR.
Now p2 v2 = p.2 v.2l,
v„ = V2
xp-i
Substituting for V the valne given in formula (x.), we get
av y^xl44x A i
W = A v = A—_____________n~ 1______< >
'_____________________-(ff______________
L his expression is a maximum for a given initial pressure
p1} when
Cp-ä2- a?2\— •
i — f n — I-- I •„ is a maximum ;
Ti7 xPi7
that is (by differentiating and equating to zero), when
or
^2
Pi
( 2 \ n
\-----i /”-1
n + 1 7
(xiii.)
For the adiabatic expansion of dry saturated steam, n =
1 *135 W is then a maximum when p., = ‘577 p2.
Other valnes of the ratio for diflferent known valijes of
Pi
n, are given in the following table :—
TABLE III.
Values of n. Values of 7'i
1-4 •528
1-3 •546
10 u •582
1 •6