Experimental and Computational Characterization of Strong Vent Flow Enclosure Fires.

Published

April 19, 2012

Author(s)

Craig G. Weinschenk

Abstract

Firefighters often arrive at structures in which the state of fire progression can be described as ventilation-controlled or under-ventilated. This means that inside the enclosure the pyrolyzed fuel has consumed most, if not all of the available oxygen, resulting in incomplete combustion. Under-ventilated (fuel rich) combustion is particularly dangerous to occupants because of the high yield of toxins such as carbon monoxide and to firefighters because once firefighters enter the structure and introduce oxidizer, the environment can rapidly change into a very dangerous, fast burning condition. The fuel load in many compartment fires would support a several megawatt fire if the fire were not ventilation controlled. In the process of making entrance to the fire compartment, firefighters will likely provide additional ventilation paths for the fire and may initiate firefighting tactics like positive pressure ventilation to push the hot flammable combustion products out of the attack pathway. Forced ventilation creates a strongly mixed flow within the fire compartment. Ventilation creates a complex fluid mechanics and combustion environment that is generally not analyzed on the scale of compartment fires.

Citation

Grant/Contract Reports (NISTGCR) - 12-968

Report Number

12-968

NIST Pub Series

Grant/Contract Reports (NISTGCR)

Pub Type

NIST Pubs

Download Paper

Local Download

Keywords

combustion, compartment fires, fuel, heat transfer, ventilation, structure fires

Citation

G., C. (2012), Experimental and Computational Characterization of Strong Vent Flow Enclosure Fires., Grant/Contract Reports (NISTGCR), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=911248 (Accessed April 25, 2024)