Citation

Huang P, Zhang R, Yu L, Liu C. Environ. Sci. Pollut. Res. Int. 2023; ePub(ePub): ePub.

Copyright

(Copyright © 2023, Holtzbrinck Springer Nature Publishing Group)

DOI

10.1007/s11356-023-26748-1

PMID

37012572

Abstract

Annular fire source is a common combustion form in fire accidents. Effects of D(in)/D(out) (the ratio of inner to outer diameters of the floating-roof tank) on the flame morphology and plume entrainment mechanisms of annular pool fires were studied by numerical simulation.

RESULTS show, as D(in)/D(out) increases, the area with low combustion intensity near the central axis of the pool surface gradually increases. Combined with the time-series HRR and the stoichiometric mixture fraction line of the fire plume, it reveals that the combustion of annular pool fire is dominated by non-premixed diffusion flame. The pressure near the pool outlet decreases with D(in)/D(out), while the plume turbulence presents an opposite trend. Based on the time-sequential plume flow and the gas-phase material distribution data, the flame merging mechanism of the annular pool fires is revealed. Furthermore, based on the similarity criterion, it verifies that the applicability of the above scaled simulation conclusions could also be extended to guide full-scale fires.

Language: en

Keywords

Numerical simulation; Annular pool fire; Flame merging; Full-scale simulation; Non-premixed combustion; Plume flow