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Facility for Assessing Suppression Effectiveness in High Speed Turbulent Flames.


pdf icon Facility for Assessing Suppression Effectiveness in High Speed Turbulent Flames. (360 K)
Gmurczyk, G. W.; Grosshandler, W. L.; Peltz, M.; Lowe, D. L.

Combustion Institute/Eastern States Section. Chemical and Physical Processes in Combustion. Fall Technical Meeting, 1993. October 25-27, 1993, Princeton, NJ, 487-490 pp, 1993.

Keywords:

turbulent flames; suppression; halon 1301; aircraft engines; nacelle fires; fire protection; nitrogen

Abstract:

The work described in this paper is part of a larger effort focused on finding alternatives to halon 1301 for application to aircraft engine nacelle and dry bay in-flight fire protection. The engine nacelle encases the compressor, combustor and turbine. Protection is required to eliminate a possible fire resulting from leaking fuel, hydraulic, or lubrication lines. Dry bays refer to closed spaces in the wings and fuselage, inaccessible in flight, and into which fuel could spray and possibly ignite following an equipment malfunction. Alternative chemical compounds are sought which do not create unacceptable safety, environmental, or systems compatibility problems. Four burner arrangements are being used to rank the relative suppression effectiveness of different gaseous agents: [1] a cup burner similar to the design of Sheinson et al. (1989) [2] an opposed flow diffusion flame (OFDF) burner following the technique developed by Seshadri (1977), [3] a turbulent spray flame burner (Grosshandler et al., 1993), and [4] a detonation tube. The detonation tube discussed in this article has been chosen to examine the performance of alternative agents in a highly dynamic situation, in which the residence time of the agent in the reaction zone is an order of magnitude shorter than in the other three burners and in which pressure effects on the chemistry are thought to be important.