Abstract
An improved flame extinguishing criterion is implemented
to the Fire Dynamics Simulator (FDS) for gaseous
suppressants under the lumped species model with
transport-limited combustion (infinitely fast chemistry).
The criterion considers the total enthalpy of gas mixture
as a function of temperature, and evaluates whether a
limiting adiabatic flame temperature can be obtained due
to combustion in a cell. The model is validated against a
number of experiments in the cup-burner apparatus, a
standard means of obtaining the minimum
flame-extinguishing concentrations (MEC) for a variety of
fuel-suppressant combinations. The results indicate that
the model can reproduce the MEC values for all common
inert gas agents, as well as some of the fluorinated
halocarbon agents. It is further demonstrated in the
paper that the flame extinguishment criterion, although
validated using grid cells on the order of 1 mm, is
equally applicable to larger cell sizes more appropriate
for full-scale simulations. This improves the capability
of FDS to predict the performance of full-scale fire
suppression systems
| Original language | English |
|---|---|
| Pages (from-to) | 781-793 |
| Journal | Fire Safety Journal |
| Volume | 10 |
| DOIs | |
| Publication status | Published - 2011 |
| MoE publication type | A4 Article in a conference publication |
| Event | 10th International Symposium on Fire Safety Science - College Park, United States Duration: 19 Jun 2011 → 24 Jun 2011 |
Keywords
- CFD
- cup-burner
- inert gas
- NFPA 2001
- suppression