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Effect of CF3H and CF3Br on Laminar Diffusion Flames in Normal and Microgravity



B. A. VanDerWege, M T. Bush, S Hochgreb, Gregory T. Linteris


Due to the ban on production of bromotrifluoromethane (CF3Br) because of its high ozone destruction potential, there has been recent interest in finding a replacement for it for fire extinguishing applications. While a variety of potential replacements are being considered, halogenated hydrocarbons may be a viable alternative for some applications. Consequently, an improved understanding of their action in flames will aid in their effective use. In addition, CF3Br is used as a fire suppressant on the space shuttle, and its action in microgravity has not been tested in diffusion flames. The present study investigates the effects of CF3Br and trifluoromethane (CF3H), the simplest compound representative of the fluorocarbons, in laminar diffusion flames. The primary experiments are laminar gas-jet diffusion flames burning in a quiescent environment containing the inhibitor in normal and microgravity. Experiments were conducted with CF3Br mole fractions in the oxidizer gas of 0.5% to 3%, CF3H mole fractions of 4% to 12%, oxygen mole fractions from 18% to 30%, and ambient pressures of 101 kPa and 25 kPa. Additional opposed-jet counterflow diffusion flame experiments were used to investigate flame structures observed in the microgravity flames.
Proceedings Title
Combustion Institute/Eastern States Section
Conference Dates
October 16-18, 1995
Conference Location
Worcester, ME, US
Conference Title
Chemical and Physical Processes in Combustion


combustion, laminar flames, diffusion flames, gravity, bromotrifluoromethane, experiments, microgravity


VanDerWege, B. , Bush, M. , Hochgreb, S. and Linteris, G. (1995), Effect of CF3H and CF3Br on Laminar Diffusion Flames in Normal and Microgravity, Combustion Institute/Eastern States Section, Worcester, ME, US, [online], (Accessed February 29, 2024)
Created October 15, 1995, Updated October 12, 2021