Drop burning rates of hydrocarbon and nonhydrocarbon fuels Page: 3 of 24
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NACA RM E57F11
The studies reported herein were undertaken to provide drop-burning-
rate data that could be used to investigate possible correlations with
the combustion efficiency data of reference 4. Drop burning rates of some
of the fuels investigated in reference 4 previously had been determined
in reference 5. However, since a self-consistent set of fuel data was
desirable in order to assure uniformity of the results, drop-burning data
were obtained in this study for most of the fuels that had been investi-
gated in reference 4.
Single drops of fuel were suspended from a fine quartz filament in
quiescent air. The drop was then ignited and was photographed with a
movie camera. A platinum wire having a known diameter was positioned in
the plane of the filament and was photographed at the beginning of each
series of new runs, in order to convert image distances on the photographs
to absolute values of drop diameter.
The data are compared with drop burning data presented in reference
5 and with theoretical drop burning data determined from equations de-
veloped in reference 6. In addition, the relative drop burning rates are
compared with the relative performance characteristics of the fuels in a
turbojet combustor (ref. 4).
FUELS
Physical properties of the fuels tested, including the references
from which these properties were obtained, are presented in table I. The
fuels selected were as follows:
Hydrocarbons Oxygenated Nonhydrocarbons
Hydrocarbons
Isooctane Methanol Carbon disulfide
(2,2,4-Trimethyl
pentane)
2,2-Dimethyl Propylene Acrylonitrile
butane oxide
2-Pentene Diethyl ether Butylsilane
Isopentane Acetone
Benzene
n-Heptane
Cyclohexane
Methyl cyclohexane
APPARATUS AND PROCEDURE
The apparatus used to determine the burning rate of the fuel drops
(fig. 1) was the same as that used in reference 7. Fuel drops2
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Smith, Arthur L. & Graves, Charles C. Drop burning rates of hydrocarbon and nonhydrocarbon fuels, report, August 6, 1957; (https://digital.library.unt.edu/ark:/67531/metadc63613/m1/3/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.