Investigation of Fire Impingement on a Horizontal Ceiling.
Investigation of Fire Impingement on a Horizontal
Ceiling.
(3330 K)
You, H. Z.; Faeth, G. M.
NBS GCR 80-251; 49 p. July 1980.
Sponsor:
National Bureau of Standards, Gaithersburg, MD
Available from:
National Technical Information Service
(NTIS), Technology Administration, U.S. Department of
Commerce, Springfield, VA 22161.
Telephone:
1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900.
Website: http://www.ntis.gov
Order number: PB80-220437
Keywords:
flame impingement; heat transfer; convection; radiation;
temperature; velocity; ceilings
Abstract:
This report covers the second year of a three-year
study. The first year of the investigation was devoted
to convective ceiling heat flux measurements. The
present effort concentrated on radiative heat flux
measurements and a portion of the flow. structure
measurements. A new experimental apparatus was
constructed which allows the long term testing needed
for structure measurements. This arrangement has a
water-cooled ceiling, 1 m in diameter. The fire source
is simulated by a 55 mm ID burner fueled with natural
gas operating at heat release rates up to 8.5 kW.
Convective and radiative heat fluxes are measured with
heat flux gages, mean gas temperatures were obtained
with fine wire thermocouples, mean velocities and
velocity fluctuations are measured with a laser Doppler
anemometer, an impact probe is also used for mean
velocities, and mean concentrations are measured by
isokinetic gas sampling with gas chromatograph.
Measurements completed to date include: flame shape,
convective and radiative heat fluxes to the ceiling,
radiative heat fluxes to the ambiance, mean
temperatures, and mean velocities and velocity
fluctuations in the plume portion of the flow.
