Observations on the combustion of boron slurry droplets in air
Single fiber-supported slurry droplets composed of boron in JP-10 were ignited and burned in room-temperature air. Initial droplet diameters ranged from 1.2 to 3.0 mm and initial boron weight fractions f from 0 to 0.7. It was observed that although the liquid fuel apparently burns completely the boron does not ignite under these experimental conditions. For the pure liquid the combustion is smooth with a measured burning-rate constant of 0.43 mm/sup 2//s. At low f there is periodic swelling of the droplet with mildly disruptive emission of gas from the interior; the severity of this irregularity is greatest for f approx. = 0.1 and negligible for f greater than or equal to 0.2. For f less than or equal to 0.4 a reduction in droplet diameter, according to a d/sup 2/ law, is observed for a period of time, followed by a burning period of essentially constant diameter. For f greater than or equal to 0.5, the droplet diameter remains practically constant during combustion, although the measured burning time conforms to a d/sup 2/ law. These observations are compared quantitatively with theoretical predictions and are found to agree within accuracies ranging from 10% to 25%.
- Research Organization:
- AT and T Engineering Research Center, P.O. Box 900, Princeton, NJ
- OSTI ID:
- 7100070
- Journal Information:
- Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 67:1; ISSN CBFMA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ACCURACY
AIR
AMBIENT TEMPERATURE
BENCH-SCALE EXPERIMENTS
BORON
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
COMBUSTION PROPERTIES
DISPERSIONS
DROPLETS
ELEMENTS
EMISSION
FLUIDS
FUEL SLURRIES
FUELS
GASES
IGNITION
KINETICS
LIQUID FUELS
MATHEMATICAL MODELS
MIXTURES
PARTICLES
REACTION KINETICS
SEMIMETALS
SLURRIES
SUSPENSIONS
SWELLING
TIME DEPENDENCE
WEIGHT