Analytical evaluation of effect of equivalence ratio inlet-air temperature and combustion pressure on performance of several possible ram-jet fuels Page: 2 of 60
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TECH LIBRARY KAFB, NM
1143388
NACA RM E53G14
NATIONAL ADVISORY COMM FOR AERONAUTICS
RESEARCH MEbMRANDJXM ,
ANALYTICAL EVALUATION OF EFFECT OF EQUIVALENCE RATIO, INLET-AIR
TEPERA ZTRE, AND COMBUSTION PRESSURE ONM PERFORMANCE
OF SEVERAL POSSIBLE RAM-JET FUELS
By Leonard K. Tower and Benson E. Gammon
SUMMARY
An analytical investigation conducted to determine the theoretical
air specific impulse performance of several fuels over a range of equi-
valence ratios, inlet-air temperatures, and combustion pressures is
reported herein. The fuels include octene-l, 50-percent-magnesium
slurry, boron, pentaborane, diborane, hydrogen, carbon, and aluminum.
Inlet-air temperatures between 1000 and 9000 F are considered at a com-
bustion pressure of 2 atmospheres; a combustion pressure of 0.2 atmos-
phere is also considered at an inlet-air temperature of 1000 F.
The benefit to air specific impulse of an increase in inlet-air
temperature at the higher equivalence ratios was reduced by such high
temperature effects as dissociation and increased specific heats of
the combustion products. An increase in combustion pressure from 0.2
to 2 atmospheres raised the air specific impulse level as much as 5
seconds at higher equivalence ratios. The fuel consumption of penta-
borane and diborane remained below that of octene-1 despite the adverse
effect of boron oxide vaporization on the performance of fuels contain-
ing boron at combustion temperatures exceeding 30000 RJ the fuel con-
sumption of boron became higher than that of octene-1 above this tem-
perature. Boron, as well as diborane and pentaborane, provided higher
air specific impulse than octene-l at an equivalence ratio of 1.0.
Means are shown for extending the data to inlet conditions beyond
the limited range of inlet-air temperatures and combustion pressures
considered. Also discussed are the determination of air specific im-
pulse efficiency and combustion efficiency for experimental data by the
use of theoretical results and the estimation of the relative amounts of
the various fuels required to maintain a fixed level of thrust in an
engine.1 ~ ---~-))~~ C
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Tower, Leonard K. & Gammon, Benson E. Analytical evaluation of effect of equivalence ratio inlet-air temperature and combustion pressure on performance of several possible ram-jet fuels, report, September 14, 1953; (https://digital.library.unt.edu/ark:/67531/metadc59663/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.