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ICLASS 94
Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems

ISBN 打印: 978-1-56700-019-1

ISBN 在线: 978-1-56700-445-5

THE DISPERSION OF FIRE SUPPRESSION AGENTS DISCHARGED FROM HIGH PRESSURE VESSELS : ESTABLISHING INITIAL/BOUNDARY CONDITIONS FOR THE FLOW OUTSIDE THE VESSEL

Abstract

This is part of a study of dispersion of Halon and Halon-alternative fire extinguishment agents discharged from N2-pressurized vessels. As liquid agent exits from the vessel, thermodynamic and fluid-dynamic instabilities lead to flashing and break-up into a two-phase droplet/gaseous jet mixture. This occurs in a transition region relatively close to the vessel exit orifice/nozzle. Downstream, the agent jet is dispersed in the protected space. A model to simulate vessel discharge was developed previously. Using the output of this and thermodynamic and fluid-dynamic considerations of phenomena in the transition region, this paper develops a method for determining time-dependent boundary conditions at an initial section of the jet, downstream of the transition region. These boundary conditions can be used to simulate development and dispersal of the ensuing air/two-phase-agent jet. Applications of the methodology are presented.
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