Suppression Criteria in Engine Nacelle Fires.
Suppression Criteria in Engine Nacelle Fires.
(867 K)
Hamins, A.; Cleary, T. G.
Alliance for Responsible Atmospheric Policy; U.S.
Environmental Protection Agency; Environment Canada;
United Nations Environment Programme; U.S. Department of
Agriculture. Stratospheric Ozone Protection for the
90's. 1995 International CFC and Halon Alternatives
Conference and Exhibition. Proceedings. October 21-23,
1995, Washington, DC, 664-673 pp, 1995.
Sponsor:
Air Force Flight Dynamics Lab., Wright-Patterson AFB
Keywords:
nacelle fires; fire suppression; aircraft safety;
blowout velocity; flame extinguishment; flammability
limits; halogenated compounds; ignition; pool fires;
sprays; halons
Abstract:
A series of experimental measurements were conducted and
simple models were developed in an effort to provide an
improved understanding of the influence of various
parameters on the processes controlling flame stability
in engine nacelle applications. The model was
constructed to predict the quantity of agent required to
suppress a generic engine nacelle fire. The model was
based on suppression experiments from a bench-scale
turbulent jet spray burner and a pool burner, and on
agent fluid mixing calculations. The experiments
indicate that fire hazard is dependent on a large number
of parameters including the air velocity, nacelle
temperature, fuel type, and system pressure in the
nacelle. The geometry of the fire configuration is
critical in defining the ease of fire suppression. The
model illustrates the importance of injection duration,
air flow, nacelle free volume, fluid mixing, and fire
scenario on the minimum agent suppression requirements.
