Fundamental flame-speed measurements in combustion gases containing CF3Br
| Autor: | D.J. Parks, Norman J. Alvares, D.G. Beason |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
Premixed flame
Materials science Laminar flame speed business.industry Diffusion flame General Physics and Astronomy Poison control Extinguishment General Chemistry Mechanics Structural engineering Combustion Flame speed General Materials Science Safety Risk Reliability and Quality business Flammability |
| Zdroj: | Fire Safety Journal. 2:237-242 |
| ISSN: | 0379-7112 |
| DOI: | 10.1016/0379-7112(79)90023-7 |
| Popis: | We have been using an acoustically tuned flame tube to measure fundamental flame speed and flammability envelopes of premixed propane/air and methane/air that contain minute amounts of CF3Br. 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 that flame speed decreases exponentially with the concentration of CF3Br regardless of the equivalence ratio, and more CF3Br 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 that CF3Br combines with free hydrogen radicals in competition with oxygen to interfere with chain-branching propagation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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