Suppression of Ignition Over a Heated Metal Surface.
Suppression of Ignition Over a Heated Metal Surface.
(880 K)
Hamins, A.; Borthwick, P.
Combustion and Flame, Vol. 112, No. 1/2, 161-170,
January 1998.
Keywords:
fire research; halogenated compounds; ignition; ignition
suppression; ignition temperature
Abstract:
The effectiveness of various agents including N2, C3HF3,
C3HF7, CF3Br and CF3I was compared in suppressing the
ignition of stoichiometric mixtures of methane/air,
propane/air, and ethene/air. Measurements were made of
the critical ignition temperature of the reactants as
they flowed over a heated nickel surface. The results
showed that CF3Br and CF2I were both hihgly effective
suppressants of ignition for all fuels studied. This
was not the case for N2, C2HF5, and C3HF7, which tended
to have little effect on ignition unless very high agent
concentrations were present, when ignition was not
achieved. The effect of the average reactant velocity
and the angle of approach of the reactants (relative to
the heated metal surface) on the critical ignition
temperature for stoichiometric ehtne/air mixtures
flowing over the heated nickel foil were also measured.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899