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Atomization and Sprays

Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

Institutional price:	$787.00
Issues per year:	8

Best Paper Award Selection - Editorial Board Site

2008, Volume18

102 pages

Issue price - $118.00

EFFECT OF ENGINE NACELLE CLUTTER DENSITY ON DOWNSTREAM WATER SPRAY DISTRIBUTIONS

John M. Davis
Engineering and Scientific Innovations Inc. Batesville, IN 47006

Peter J. Disimile
USAF 46 Test Wing, Aerospace Survivability and Safety Flight Wright-Patterson AFB, Ohio 45433-7605, USA

ABSTRACT

This investigation presents the results of spray interactions with clutter elements in a surrounding turbulent airflow, with an emphasis on aiding the development of spray transport models to be used within a computational fire code. Many Halon replacement agents have high boiling points and discharge in a liquid state, thus resulting in the transport of liquid droplets through cluttered engine nacelles. By increasing the understanding of liquid state suppressant transport through cluttered environments, the overall effectiveness of fire suppressant systems could be increased. The current paper examines agent droplet diameter and velocity at locations upstream and downstream of a clutter package consisting of staggered cylindrical arrays of various streamwise spacing. The agent (water) was discharged upstream of the clutter from a two-phase nozzle into the main airflow. Three-dimensional droplet velocity and diameter measurements were taken upstream and downstream of the clutter, for three separate clutter densities under a constant main airflow speed of approximately 5.0 m/s and a nominal turbulence level of 10%. The downstream data are compared to the upstream distributions to provide insight into the effect of clutter density on agent distribution.