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http://dx.doi.org/10.15435/JILASSKR.2017.22.4.175

Numerical Study on the Effects of Spray Properties of Water Mist on the Fire Suppression Mechanism  

Bae, Kang-Youl (대명GENT 기술연구소)
Chung, Hee-Taeg (경상대학교 기계공학부, 항공기부품기술연구소)
Kim, Hyoung-Bum (경상대학교 기계공학부)
Publication Information
Journal of ILASS-Korea / v.22, no.4, 2017 , pp. 175-184 More about this Journal
Abstract
The numerical investigation on the effects of water-mist characteristics has been carried out for the fire suppression mechanism. The FDS are used to simulate the interaction of fire plume and water mists, and program describes the fire-driven flows using LES turbulence model, the mixture fraction combustion model, the finite volume method of radiation transport for a non-scattering gray gas, and conjugate heat transfer between wall and gas flow. The numerical model is consisted of a rectangular enclosure of $L{\times}W{\times}H=1.5{\times}1.5{\times}2.0m^3$ and a water mist nozzle that be installed 1.8 m from fire pool. In the present study, the parameters of nozzle for simulation are the droplet size and the spray velocity. The droplet size influences to fire flume on fire suppression more than the spray velocity because of the effect of the terminal velocity. The optimal condition for fire suppression is that the droplet size and the spray velocity are $100{\mu}m$ and 20 m/s respectively.
Keywords
Water mist; Fire flame; Terminal distance; Droplet size; Spray velocity; Fire suppression;
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