Real-Time Suppressant Concentration Measurement.
Real-Time Suppressant Concentration Measurement.
(15770 K)
Pitts, W. M.; Mulholland, G. W.; Breuel, B. D.;
Johnsson, E. L.; Chung, S.; Harris, R. H., Jr.; Hess, D.
E.
NIST SP 890; Volume 2; Section 11; November 1995.
Fire Suppression System Performance of Alternative
Agents in Aircraft Engine and Dry Bay Laboratory
Simulations. Volume 2, Gann, R. G., Editor(s), 319-590
pp, 1995.
Available from:
National Technical Information Service
Order number: PB96-117783
Keywords:
fire suppression; aircraft engines; nacelle fires;
simulation; halon 1301; halon alternatives; aspirated
hot films; cold wires; concentration fluctuations;
concentration measurement; infrared detectors; infrared
absorption; temperature measurements
Abstract:
The development and testing of two approaches for
recording real-time measurements (millisecond time
resolution) of concentration for halon alternatives are
summarized. Discussions of the background necessary to
understand their operation is included. The first
instrument is a combined aspirated hot-film/cold-wire
probe which is calibrated to record both temperature and
concentration. The second is a specially developed
instrument based on infrared absorption near 8.5 mm
which has been dubbed the Differential InfraRed Rapid
Agent Concentration Sensor (DIRRACS). A series of tests
of the instruments in the full-scale dry-bay test
facility at Wright-Patterson AFB is summarized. The
characteristics of the current devices used to measure
halon 1301 concentrations - the Statham analyzer and
Halonyzer - are reviewed. The final section contains a
literature review assessing other potential techniques
for making the required concentration measurements.
