Numeric modeling of fire suppression by organophosphorous inhibitors

Details Numeric modeling of fire suppression by organophosphorous inhibitors Numeric modeling of fire suppression by organophosphorous inhibitors

2008-01-15

arxiv.org/abs/0801.2362v1

Physics

Chemical Physics

18 pages, 9 figures

Scientific paper

Numerical calculations of the effect of organophosphorous inhibitor (CF3CH2O)3P and its mixtures with carbon dioxide on propane flames are carried out using the three dimensional Reynolds-averaged Navier-Stokes (RANS) equations in the low Mach number approximation. The k-e model of turbulence, the EDC combustion model and the weighted-sum-of-gray-gases model of radiation are used. The Westbrook global-kinetic scheme with fractional order of reaction was used for the calculation of chemical reaction rate of propane combustion. The empirical expression for the correction factor for the chemical reaction rate was used to model the effect of organophosphorous inhibitor no the reaction. Two series of test calculations for different values of the correction factor are carried out. Dependences of the minimum extinguishing concentration of the inhibitor per carbon dioxide volume concentration in the extinguishing mixtures were obtained. The results of test calculations are shown to agree reasonably with the experimental data. A calculation of the compartment fire extinguishment was carried out using the result of test calculations. Temperature and inhibitor volume concentration fields at the moment of fire extinguishment are obtained. The results of calculation are used to find out the optimum position of the extinguish mixture source.

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