Fuels-combustion resaearch. Annual technical report, 1 October 1985-30 September 1986

Technical Report · Fri Oct 31 00:00:00 EST 1986

OSTI ID:7186666

Dryer, F L; Glassman, I; Williams, F A

After great progress related to soot formation in normal diffusion flames, studies of near sooting inverse-diffusion flames were begun to determine controlling precursors. Stable, temperature-controlled inverse-diffusion flames were successfully developed and numerous chemical samples extracted and analyzed. Observed trends are being studied. The side-chain oxidation of n-butyl benzene was found to follow the same processes as the smaller n-alkyl benzenes; abstraction, alkyl group displacement and thermal cleavage. The results led to development of a simple general, mechanistic model for the oxidation of n-alkyl benzenes. Combustion-property observations of isolated boron droplets were extended to boron/JP-10 slurries with various solid loadings. Some physical understanding of observed droplet burning and disruption behavior was developed. Quasi-spherical hollow shells of the boron agglomerate with blowholes support the hypothesis of the formation of the impermeable shell and subsequent disruption of the primary slurry droplet. Boron suspension (cloud) combustion in the hot reaction products of a flat-flame burner has been pursued. The boric acid fluctuation bands were identified spectroscopically, and conditions for their flame occurrence measured. The work progresses toward establishment of ignition conditions and combustion times of 0.1-5 micron boron particles.

• Research Organization: Princeton Univ., NJ (USA). Dept. of Mechanical and Aerospace Engineering
• OSTI ID: 7186666
• Report Number(s): AD-A-175040/5/XAB
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
FOSSIL FUELS
FUEL SLURRIES
COMBUSTION
JET ENGINE FUELS
ALKYL RADICALS
BORIC ACID
BORON
CLEAVAGE
CLOUDS
COLLOIDS
DIFFUSION
FUELS
IGNITION
OXIDATION
PERMEABILITY
SAMPLING
SOOT
VARIATIONS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DISPERSIONS
ELEMENTS
ENERGY SOURCES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MICROSTRUCTURE
MIXTURES
RADICALS
SEMIMETALS
SLURRIES
SUSPENSIONS
THERMOCHEMICAL PROCESSES
025000* - Petroleum- Combustion