Effects of oxygen and propane addition on soot formation in counterflow ethylene flames and the role of C3 chemistry

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

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

65 Scopus citations


The influence of oxygen addition and propane addition on soot formation is investigated experimentally in counterflow ethylene diffusion flames, and numerical calculations with detailed chemical reaction mechanisms are conducted to interpret experimental results. Soot volume fractions and polycyclic aromatic hydrocarbon (PAH) concentrations increase with a small amount of oxygen addition for ethylene diffusion flames but not for propane diffusion flames. This result supports that the reactions between O atoms and C2H 2 produce CH2 and eventually form C3H 3, which are responsible for the enhancement of incipient rings and thereby PAH and soot formation through C3H3 recombination reaction. When a small amount of propane is added to ethylene diffusion flames, PAH concentrations and soot volume fractions also increase. However, the simultaneous addition of oxygen and propane in ethylene diffusion flames shows that the observed soot-formation enhancement with propane addition to ethylene diffusion flames diminishes with oxygen addition to fuel stream and eventually disappears when sufficient amount of oxygen is added. This implies that the mechanisms responsible for the soot-formation enhancement with propane and oxygen addition to ethylene flames can be explained based on the same chemistry. Numerical results on C3H3 concentrations can explain successfully both the effects of oxygen and propane additioninethylene flames, through which the importance of C3 chemistry on soot formation has been demonstrated.

Original languageEnglish (US)
Pages (from-to)1531-1538
Number of pages8
JournalSymposium (International) on Combustion
Issue number1
StatePublished - 1998
Externally publishedYes
Event27th International Symposium on Combustion - Boulder, CO, United States
Duration: Aug 2 1998Aug 7 1998

Bibliographical note

Funding Information:
JYH was supported by the Creative Research Initiatives of Korean Ministry of Science and Technology, and SHC was supported by the Turbo and Power Machinery Research Center.

ASJC Scopus subject areas

  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes


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