Citation

Sun Y. China Saf. Sci. J. 2022; 32(4): 65-71.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.04.010

PMID

unavailable

Abstract

In order to explore transient radiative heat transfer characteristics of pool fires, a combustion model of methanol fire was developed based on large eddy simulation, and non⁃gray radiative properties of combustion gases were simulated by adopting accurate weighted sum of gray gases (WSGG) model. Then, transient characteristics of temperature, velocity, species concentration and radiative energy were investigated. The results show that gas temperature varies in a periodical pattern, during which high temperature gases form above pool surface, then rises, expands and spreads in cycles, with its velocity increasing first and then decreasing during rising process. Due to this factor, radiative feedback at surface shows an oscillating behavior, and radiative heat flux at center varies between - 17 and - 7 kW/ m2 drastically, which decreases along radial direction. Moreover, probability density of heat fluxes at surface spreads like a triangle. As the ground is far away from fire and partially blocked by tanks, its heat flux is one order of magnitude smaller that of pool surfaces. © 2020 China Safety Science Journal. All rights reserved.

Language: zh