Combustion regime of a reacting front propagating into an auto-igniting mixture

J. B. Martz, H. Kwak, Hong Im, G. A. Lavoie, D. N. Assanis

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

To characterize and model the combustion of a reactant mixture in a spark-assisted compression ignition (SACI) engine, one-dimensional reaction front propagation into end-gas mixtures with varying degrees of reaction progress is simulated using a skeletal iso-octane mechanism with variable transport properties. The dominant mechanism for the end-gas auto-ignition and combustion is identified based on a ratio of the corresponding flame to homogeneous ignition time scales, as a means to distinguish the transport-controlled and chemistry-controlled combustion regimes. The results indicate that reaction fronts propagating into end-gases are deflagrative provided that the temperature at the reaction front base is below 1100 K, while beyond this temperature, transport has little effect on the one-dimensional solution, indicating that reaction front propagation is chemistry-controlled. The results suggest that reaction front combustion regimes are strongly influenced by and can be separated with the end-gas temperature at the base of the reaction front.

Original languageEnglish (US)
Pages (from-to)3001-3006
Number of pages6
JournalProceedings of the Combustion Institute
Volume33
Issue number2
DOIs
StatePublished - Feb 3 2011

Keywords

  • Combustion regime
  • HCCI combustion
  • Iso-octane
  • Mild combustion
  • Spark assisted compression ignition

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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