미분무수 특성이 화재억제 메커니즘에 미치는 영향에 대한 수치해석적 연구

Abstract

The numerical investigation on the effects of water-mist characteristics has been carried out for the fire suppression mech-anism. 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×W×H=1.5×1.5×2.0 m3 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 µm and 20 m/s respectively.