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Oscillation and Fire Area Shrinkage Phenomena of Wood Crib and Heptane Pool in Ventilation-Controlled Compartment Fires.


pdf icon Oscillation and Fire Area Shrinkage Phenomena of Wood Crib and Heptane Pool in Ventilation-Controlled Compartment Fires. (12768 K)
Utiskul, Y.; Quintiere, J. G.

Volume 1;

Interflam 2007. (Interflam '07). International Interflam Conference, 11th Proceedings. Volume 1. September 3-5, 2007, London, England, 465-476 pp, 2007.

Sponsor:

National Institute of Standards and Technology, Gaithersburg, MD

Keywords:

test methods; compartment fires; wood cribs; heptane; ventilation; structures; fire growth; burning rate; fuels; mixing; vents; fire behavior; equations; experiments; pool fires; fire models

Abstract:

To predict the effect of fire on the structures, one needs to understand physics of the fire growth in a compartment as to how the fuel interacts with the flame and its surroundings. This study explores these effects and applies them to the common fuel configurations such as pool and crib fires. An experimental program for single-wall-vent compartment using wood crib and heptane pool as fuels is carried out to explore a full range of phenomena associated with under ventilated compartment fires: extinction, oscillation, fire area shrinkage, and response of fuel to thermal and oxygen effects. A single-zone compartment fire model is developed along with a fuel mass loss rate model that accounts for the thermal enhancement, oxygen-limiting feedback, and the fuel type and configuration. The simulation from the model is able to capture these phenomena and shows good agreement with the experiments. Some generalities of the fuel mass loss rate and compartment gas temperature are presented using the experimental results and the model simulations. From the simulation, the fire area shrinkage can be the reason for the fuel mass loss rate to follow the same trend as the burning rate in ventilation-controlled fires. The developed model has a potential to give burning time and temperature in a fire for any fuel, scale and ventilation.