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Atomization and Sprays
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ISSN Print: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v18.i6.50
pages 553-569

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
Department of Aerospace Engineering, University of Cincinnati, Cincinnati, OH, USA 45221-0070

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.


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