Synergistic effect of ethylene-propane mixture on soot formation in laminar diffusion flames

J. Y. Hwang, W. Lee, H. G. Kang, S. H. Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

90 Scopus citations


Sooting characteristics in laminar diffusion flames have been studied experimentally for ethylene-propane mixtures, and a synergistic effect from mixture fuels has been observed. Soot volume fraction and polycyclic aromatic hydrocarbon (PAH) concentration are increased when a small amount of propane is added to ethylene diffusion flames. Considering C2H2 concentrations and adiabatic flame temperatures, the experimental results indicate that H- abstraction-C2H2-addition (HACA) reaction alone is insufficient to explain soot inception and growth processes in diffusion flames of ethylene-propane mixtures. The synergistic effect of fuel mixture is discussed, emphasizing the importance of C3 recombination reaction during the initial ring formation process for incipient PAHs. The results of soot number density and particle size in low-temperature soot growth region also support continuous soot inception via PAH agglomeration. Therefore, it is suggested that PAHs are directly involved ill the soot particle inception processes. The synergistic effect is less significant for ethylene-ethane mixtures compared to ethylene-propane mixtures.

Original languageEnglish (US)
Pages (from-to)370-380
Number of pages11
JournalCombustion and Flame
Issue number3-4
StatePublished - Aug 1998
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology
  • General Physics and Astronomy


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