- Author
-
Ogawa, Y.
- Title
- Effect of Interaction Between Halogenated Fire Suppressants and Inert Gases on the Extinction Limit of Premixed Flames.
- Coporate
- National Research Institute of Fire and Disaster, Tokyo, Japan
- Report
-
BFRL Seminar,
March 27, 1997,
- Keywords
-
premixed flames
|
inert gases
- Abstract
- A synergistic effect betwen halon 1301 and inert gases was found in previous studies of flame suppression efficiency using a cup burner diffusion flame. Further Experiments using a variety of suppressants in premixed tubular flames (methane/air) were performed in order to better understand the causes of this effect. The halogenated suppressants considered,in addition to halon 130 were: tetrafluoromethane, HFC-23, HFC-227ea and FC-3-1-10. The synergistic effects in halon 1301/nitrogen and concentrations of the suppressant at the limit of extinction were measured. The maximum synergy between halon 1301 and nitrogen was observed for a mixture consisting of 10% halon 1301 and 90% nitrogen (by mole). The effect is most pronounced at stoichiometric conditions. A negative synergy was observed for binary mixtures of nitrogen with each of the following suppressants: HFC-23, HFC227ea and FC-3-1-10. The presence of nitrogen, however had no effect the experimental extinction limits of the methane/air flames by tetrafluoromethane.