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Model for Predicting the Generation Rate and Distribution of Products of Combustion in Two-Layer Fire Environments.


pdf icon Model for Predicting the Generation Rate and Distribution of Products of Combustion in Two-Layer Fire Environments. (6703 K)
Cooper, L. Y.

NISTIR 4403; 53 p. September 1990.

American Society of Mechanical Engineers (ASME). Heat and Mass Transfer in Fire and Combustion Systems. ASME HTD Vol. 176. 1991, ASME, New York, Yao, S. C.; Chung, J. N., Editor(s)(s), 9-22 pp, 1990.

Available from:

National Technical Information Service
Order number: PB91-107151

Keywords:

combustion; building fires; compartment fires; computer models; fire models; mathematical models; zone models; global equivalence ratio

Abstract:

A model is developed for predicting the generation rates of oxygen, fuel, and any other products of combustion in rooms containing fires. The model is called the generalized global equivalence ratio model. It extends the steady state global equivalence ratio model established from steady-state data of several previous experimental studies. After describing the model in detail, a concise algorithm is outlined for implementing it in two-layer zone-type compartment fire model computer codes. With the algorithm in place, such codes could be used to simulate the distribution of combustion products in single or multi-room fire environments. In an example application, the model simulates the time-dependent environment, including that of steady-state, in conditions and under the assumption of complete stoichiometric combustion, solutions for concentrations of products of combustion are obtained and presented. The solutions are used to predict the time-to-extinguishment of a burning methane fuel source embedded in an initially ambient-atmosphere upper layer.