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Suppression of Low Strain Rate Flames by an Agent.


pdf icon Suppression of Low Strain Rate Flames by an Agent. (884 K)
Hamins, A.; Bundy, M.; Puri, I. K.

NISTIR 6588; November 2000.

U.S./Japan Government Cooperative Program on Natural Resources (UJNR). Fire Research and Safety. 15th Joint Panel Meeting. Volume 1. Proceedings. March 1-7, 2000, San Antonio, TX, Bryner, S. L., Editor(s), 250-257 pp, 2000.
Order number: PB2001-101517

Keywords:

fire safety; fire research; fire suppression; halons; flame extinction

Abstract:

The structure and suppression of low strain rate methane-air nonpremixed flames were investigated experimentally and computationally. Measurements of the critical suppression conditions were conducted using N2, CO2, and CF3Br added to the fuel or oxidizer streams. Temperature measurements were made with small platinum thermocouples (0.025 mm wire diameter) that were coated with a fine layer (0.010 mm) of SiO2 and corrected for radiative losses. Numerical simulations of the non-luminous diluted flames included radiative heat losses by participating gaseous species. A previously developed narrowband model of radiative transfer was incorporated into the one-dimensional flame simulation. For comparison, radiation was also modeled as an optically thin gray gas, represented by Plank mean absorption coefficients.