A comparative study of the extinguishment characteristics of liquid heptane and gaseous propane diffusion flames in a co-flowing stream of air in an apparatus simulating the NFPA standard 2001-cup burner apparatus is presented. A physical agent, carbon dioxide, and a chemical agent Halon 1301 were used as flame extinguishing agents. Results indicate that when the agents were premixed with air, the concentrations of CO2 and Halon 1301 at extinction of propane flames were approximately the same as the corresponding values in heptane flames. Results are substantiated with the measurements of in-flame temperature profiles and exhaust gas composition/temperature measurements in the flames.

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