Performance of pure fuels in a single J33 combustor 1: five liquid hydrocarbon fuels Page: 2 of 45
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NACA RM E52JOZ33 1176 01435 6324
NATIONAL ADVISORY COMITEE FOR AERONAUTICS
RESEARCH MEMORANDUM
PERFORMANCE OF PURE FUELS IN A SINGLE J33 COMBUSTR
I - FIVE LIQUID HYDROCARBON FUELS
By Jerrold D. Wear and Ralph T. Dittrich
SUMMARY
Investigations of several pure hydrocarbon fuels were conducted in
a single tubular-type combustor in order to determine possible relations
between combustor performance and fuel properties. The combustor tem-
perature rise, combustion efficiency, and blow-out limits were determined
with five liquid hydrocarbon fuels of high purity over a range of heat
input and air-flow rates and at two inlet-air-temperature conditions.
The fuels were isooctane, cyclohexane, methylcyclohexane, n-heptane,
and benzene. Performance parameters were selected to compare with the
physical and fundamental combustion properties of the fuel.
The general performance order among the fuels was: benzene highest;
isooctane lowest; cyclohexane, methylcyclohexane, and n-heptane inter-
mediate. Of the several fuel properties considered, maximum burning
velocity best correlated with fuel performance, indicating an approxi-
mately linear increase n the performance of the fuels with an increase
in burning velocity. For the various test conditions investigated, the
maximum combustor temperature rise and the combustion efficiencies
increased by 2300 to 4000 F and 2 to 17 percent for an increase in max-
imum burning velocity from 34.6 to 40.7 centimeters per second.
INTRODUCTION
Research is being conducted at the NACA Lewis laboratory to deter-
mine poss-ible design parameters for improving the performance of tur-
bojet engines. One phase of the over-all program is concerned with
improving combustion efficiency and the altitude combustion blow-out
limits of the combustor. Investigations of this phase of the research
included systematic changes in combustor design and performance evalua-
tions of various types of fuels. Results of some of these investigations
are summarized in reference 1. These studies were concerned primas.rily
with over-all effects on performance; that is, they did not attempt to
describe combustion inefficiency and blow-out in terms of basic processes
which take place within the combustor. Knowledge of the importance of
each of the several basic processes in establishing over-all combustor
performance would assist materially in a rational approach to design
improvements and fuel selection.
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Wear, Jerrold D. & Dittrich, Ralph T. Performance of pure fuels in a single J33 combustor 1: five liquid hydrocarbon fuels, report, November 21, 1952; (https://digital.library.unt.edu/ark:/67531/metadc59429/m1/2/: accessed April 26, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.