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

Author

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  • Shim, Sung Hoon
  • Ahn, Kook Young
  • Jeong, Sang Hyun
  • Keel, Sang In
  • Shin, Hyun Dong

Abstract

The morphologies of deposits on 15-[mu]m 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.

Suggested Citation

  • Shim, Sung Hoon & Ahn, Kook Young & Jeong, Sang Hyun & Keel, Sang In & Shin, Hyun Dong, 2004. "Study of deposit morphology in a propane diffusion-flame under fuel-rich conditions," Applied Energy, Elsevier, vol. 79(2), pages 179-189, October.
    • Handle: RePEc:eee:appene:v:79:y:2004:i:2:p:179-189
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