Temperature profiles in forced-ventilation enclosure fires
We investigated the effect of ventilation rate, ventilation configuration, fire elevation, and the presence of a plenum (suspended ceiling) on the fire compartment temperatures during forced ventilated methane gas fires (100-400 kW). We found that with low air-inlet positions, fires with ventilation rates greater than 2 to 3 times the stoichiometrically required air (referred to here as well-ventilated fires) produce two-layer temperature profiles; fires with a lower ventilation rate (under-ventilated fires) produce single-layer profiles with a temperature gradient. Higher temperatures throughout the enclosure are seen in underventilated fires as compared to well-ventilated fires. We observed that high air-inlet locations perturb the two-layer temperature profile of the well-ventilated fire, cooling the upper layer and heating the lower layer. For underventilated fires, high air-inlet locations lower temperatures in the enclosure but do not perturb the profile shape. Elevated fires and fires in a compartment with a plenum were seen to behave similarly for the same distance from fire base to ceiling, producing hotter layers the shorter the distance. 9 refs., 13 figs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5128968
- Report Number(s):
- UCRL-97975; CONF-880634-2; ON: DE88006807
- Resource Relation:
- Conference: 2. international symposium on fire safety science, Tokyo, Japan, 13 Jun 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FIRES
VENTILATION
AIR
AIR FLOW
CEILINGS
LAYERS
METHANE
SAFETY
TEMPERATURE MEASUREMENT
ALKANES
FLUID FLOW
FLUIDS
GAS FLOW
GASES
HYDROCARBONS
ORGANIC COMPOUNDS
570000* - Health & Safety
400800 - Combustion
Pyrolysis
& High-Temperature Chemistry