A PDF method for multidimensional modeling of HCCI engine combustion: Effects of turbulence/chemistry interactions on ignition timing and emissions

Y. Z. Zhang, E. H. Kung, D. C. Haworth

Research output: Contribution to journalConference article

79 Scopus citations


In the limit of homogeneous reactants and adiabatic combustion, ignition timing, and pollutant emissions in homogeneous-charge compression-ignition (HCCI) engines would be solely governed by chemical kinetics. As one moves away from this idealization, turbulence and turbulence/chemistry interactions (TCI) play increasingly important roles. The influence of TCI on autoignition and emissions of CO and unburned hydrocarbon (UHC) is studied using a three-dimensional time-dependent computational fluid dynamics (CFD) model that includes detailed chemical kinetics. Heptane is used as fuel. For nearly homogeneous reactants with low to moderate swirl and no top-ring-land crevice (TRLC), TCI has little effect on ignition timing. With increasing levels of swirl, higher degrees of mixture inhomogeneity, and for cases that include a TRLC, TCI effects become increasingly important and result in significant changes in ignition timing, global in-cylinder temperature and pressure, and emissions. The combination of consistent hybrid particle/finite-volume algorithms, detailed chemical kinetics, and chemistry acceleration strategies makes probability density function methods practicable for three-dimensional time-dependent modeling of HCCI autoignition and emissions. This is an abstract of a paper presented at the 30th International Symposium on Combustion (Chicago, IL 7/25-30/2004).

Original languageEnglish (US)
Pages (from-to)2763-2771
Number of pages9
JournalProceedings of the Combustion Institute
Volume30 II
Issue number2
Publication statusPublished - Jan 1 2005
Event30th International Symposium on Combustion - Chicago, IL, United States
Duration: Jul 25 2004Jul 30 2004


All Science Journal Classification (ASJC) codes

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

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