Effect of inlet temperature and humidity on thrust augmentation of turbojet engine by compressor-inlet injection Page: 2 of 48
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NACA RM E50D19 3 1176 01434 4866
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS'
EFFECT OF INLET TEMPERATE AND HUMIDITY ON THRUST
AUGMENTATION OF TURBOJET ENGINE BY
By Thomas B. Shillito and James L. Harp, Jr.
An investigation has been conducted at conditions of zero ram
and sea-level pressure to determine the effect of inlet temperature
and humidity on turbojet-engine performance with injection of water
and water-alcohol mixtures at the compressor inlet. The inlet-air
temperature was varied by mixing atmospheric air with exhaust gases
recovered from the exhaust jet of the engine, and the inlet humidity
was varied by evaporating water in the exhaust gas used for heating
the inlet air. It was found that at a given engine speed and tail-
pipe temperature, both the thrust and total mass flow for the com-
plete range of compressor-inlet temperatures, composition of injected
mixtures, and injected flows investigated were functions only of the
compressor-pressure ratio, The pressure ratio, and hence the aug-
mented thrust, increased with injected flow and at a constant injected
flow decreased with compressor-inlet temperature. The effect of inlet
temperature on compressor pressure ratio and thrust became less pro-
nounced as compressor-inlet injected flow increased. The augmented
thrust ratio increased with compressor-inlet temperature at a con-
stant total liquid flow. At a total liquid flow of 5 pounds per
second, the augmented thrust ratio obtained at rated engine speed
and tail-pipe gas temperature (as permitted by use of a variable-
area exhaust nozzle) increased from 1.26 to 1.62 as the compressor-
inlet temperature was increased from 600 F to 2000 F. At a given
inlet temperature and injection rate, the thrust decreased slightly
with increasing humidity, the effects being more pronounced at the
higher injection rates.
A simple method of increasing the thrust of turbojet engines
is by the injection of refrigerants at the compressor inlet. The
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Shillito, Thomas B. & Harp, James L., Jr. Effect of inlet temperature and humidity on thrust augmentation of turbojet engine by compressor-inlet injection, report, July 3, 1950; (https://digital.library.unt.edu/ark:/67531/metadc58542/m1/2/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.