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National Advisory Committee for Aeronautics, Research Memorandum - Free Jet Performance of 16-Inch Ram-Jet Engine with Several Fuels

Several fuels were used in a 16—inch ram-Jet engine during a
free-Jet investigtion of ram-Jet performance in the NAGA Lewis
altitude wind tunnel. The fuels used were: msoline (AN-F-dd‘b),
kerosene (Ali-F452), blend .(by volume) of 50-percent gasoline and 50-
percent propylene oxide, blend (by volume) of 75-percent kerosene
and 25-percent propylene oxide, and isopentane.

Data are presented showing ranges of operation, 'ccm'bustion
efficiencies, and weight and volume specific fuel consumptions obtained
with the various fuels. mum ranges of operation were obtained
with the blends of propylene oxide. Under the more difficult operating
conditions (low inlet temperatures), fuels having the lowest 50-percent
boiling points gave the highest combustion efficiencies. Gasoline gave
minimum values of weight specific fuel consumption, whereas kerosene
ave minimum values of volume specific fuel consumption.

During a free-Jet study of the internal performance of a 16-inch
ram-Jet engine conducted at the EAGA Lewis laboratory (reported in
reference 1), data were obtained with several fuels. These data,
which are reported herein, do not constitute a systematic and compre-
hensive study of the effect of fuel on ram-Jet performance, but are
sufficient to give some trends in the effects of specific fuels on
engine performce.

The fuels investigated were: clear @soline (AN -F-48b) , hero:
sene (AN-F-32), blend (by volume) of 50-percent gasoline plus 50-percent
propylene oxide, blend (by volume) of 75-percent kerosene plus 25-
percent propylene oxide, and isopentane.

The fuels geoline and kerosene were selected because of their
availability and current use in aircraft. The two blends were selected
Security Classification of This Repori iaé Been Cancelled
on the basis of previous investigations with propylene oxide (refer-
ences 2 and 3). Isopentane was investigated because of the low 50-
percent boiling point, a desirable property for engine operation under
severe burner-inlet conditions (references 4 to 7).