Fundamental flame-speed measurements in combustion gases containing CF/sub 3/Br. WSS Paper No. 79-16
An acoustically tuned flame tube was used to measure fundamental flame speed and flammability envelopes of premixed propane/air and methane/air that contain minute amounts of CF/sub 3/Br. The flat propagation boundaries produced by this tube allow one to measure fundamental flame speed directly without having to make complicated velocity adjustments because of irregular flame shape. Measurement data show flame speed decreases exponentially with the concentration of CF/sub 3/Br regardless of the equivalence ratio, and more CF/sub 3/Br is needed to make fuel-rich mixtures inert than to make fuel-lean mixtures inert. Consequently, one can attain significantly lower flame speed on the fuel-rich side of the flammability envelope. The implications of these data for gross extinguishment mechanisms indicate CF/sub 3/Br combines with free hydrogen radicals in competition with oxygen to interfere with chain-branching propagation. 14 figures.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6064470
- Report Number(s):
- UCRL-82181; CONF-790434-2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ADDITIVES
AIR
ALKANES
BROMINATED ALIPHATIC HYDROCARBONS
CHEMICAL REACTIONS
COMBUSTION
CRYOGENIC FLUIDS
DISPERSIONS
FIRE EXTINGUISHERS
FLAME PROPAGATION
FLAMES
FLAMMABILITY
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
GASES
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
METHANE
MIXTURES
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXIDATION
PROPANE
THERMOCHEMICAL PROCESSES