Model for Predicting the Generation Rate and Distribution of Products of Combustion in Two-Layer Fire Environments.
Model for Predicting the Generation Rate and
Distribution of Products of Combustion in Two-Layer Fire
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
combustion; building fires; compartment fires; computer
models; fire models; mathematical models; zone models;
global equivalence ratio
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.