Study of deposit morphology in a propane diffusion-flame under fuel-rich conditions

The morphologies of deposits on 15-mum diameter SiC fibres have been investigated with a scanning electron-microscope and compared with UV-excited laser-induced broadband fluorescences in a confined co-flowing, propane/air laminar diffusion-flame under a fuel-rich condition. A double structure of polycyclic aromatic hydrocarbon (PAH) fluorescence, having a hollow region between the central and outer fluorescence images, was observed in confined flames under extremely fuel-rich conditions. A comparison of the PAH fluorescence with the morphologies of the deposits indicates that the "dark" hollow zone is caused by a decreased number density of large grown-up droplet-like condensed-phase molecules, and the outer weak fluorescence zone is caused by the diffusion of gas-phase small ones. The evolution of soot precursors is stopped at the earlier stage of transition, to soot from condensed-phase large molecules in the non-sooting diffusion flame, under a fuel-rich condition. (C) 2004 Elsevier Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2004-10
Language
ENG
Keywords

POLYCYCLIC AROMATIC-HYDROCARBONS; SOOT FORMATION; VISIBLE FLUORESCENCE; PARTICLES; OXYGEN; ULTRAVIOLET; INCEPTION; PYROLYSIS; GROWTH

Citation

APPLIED ENERGY, v.79, no.2, pp.179 - 189

ISSN
0306-2619
DOI
10.1016/j.apenergy.2003.12.007
URI
http://hdl.handle.net/10203/84634
Appears in Collection
ME-Journal Papers(저널논문)
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