Starting characteristics and combustion performance of magnesium slurry in 6.5-inch-diameter ram-jet engine mounted in connected-pipe facility Page: 2 of 26
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TECH LIBRARy KAFB, NM
NACA . E535 014326 7
NATIONAL ADVISORY CO CITTEE FOR AERONAUTICS
STARTING CHARACTERSTICS AND COMBUSTION PERFORMANCE OF MAGNESIUM SLURRY
IN 6.5-INCH-DIAMETER RAM-JET ENGINE MOUNTED IN CONNECTED-PIPE FACILITY
W By James B. Gibbs
The starting characteristics and combustion performance of 50 per-
cent magnesium powder in a hydrocarbon carrier were investigated in a
flight-type, 6.5-inch-diameter ram-jet engine mounted in a connected-
pipe facility. Starting disks, metal plates mounted in the combustion
chamber and blocking part of the burner area, were developed that provide
quick, dependable starting of the engine over the starting equivalence
ratio range investigated, 0.36 to 0.69. After the engine was started,
the disk was expelled to permit normal operation of the engine. One of
the disks was expelled within 0.1 second after fuel-flow initiation. No
explosive starts were experienced. A flame-holder protection plate,
designed to cover the cavity in the flame-holder mounting tube, permitted
operation without flame-holder damage for test durations of about 20 sec-
onds. The combustion tests were made with a short, 8.5-inch fuel-air mix-
ing length, because combustion instability was encountered in previous
free-jet tests with a longer mixing length. The combustion efficiency was
above 77 percent for the equivalence ratio range from 0.5 to 1.0 and
reached a maximum of 81 percent at an equivalence ratio of 0.7. In-
creases in inlet-air temperature from about 600 to 3700 F caused increases
in combustor efficiency of 12 to 22 percent over the equivalence ratio
Performance data obtained with the slurry system having the short fuel-
air mixing length were compared with performance data obtained in the free-
Jet and flight tests of similar ethylene-fueled ram-Jet engines at the NACA
Langley laboratory. The slurry fuel provided over twice the fuel volume
specific impulse; however, the fuel weight specific impulse was slightly
higher for the ethylene fuel. An air specific impulse of 187 seconds was
obtained with the slurry fuel, while the maximum obtained with ethylene
was 159 seconds. In the Langley flight-test vehicle, a greater fuel load
and a greater thrust would be possible if the ethylene fuel were replaced
by a magnesium slurry. Therefore, .higher flight speeds, higher altitudes,
a and longer flight durations should be attainable with the slurry fuel.
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Gibbs, James B. Starting characteristics and combustion performance of magnesium slurry in 6.5-inch-diameter ram-jet engine mounted in connected-pipe facility, report, January 28, 1954; (digital.library.unt.edu/ark:/67531/metadc59416/m1/2/: accessed May 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.