Analytical model for auto-ignition in a thermally stratified HCCI engine

Ramanan Sankaran*, Hong G. Im, John C. Hewson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The characteristics of auto-ignition in HCCI engines in the presence of charge stratification is studied theoretically using activation energy asymptotics. The analysis accounts for the effects of pressure rise due to piston motion and heat release, and the consequent compression-heating of the charge. The chemical kinetics are approximated using a single reaction step with a large activation energy and the compression-heating effects are accounted for through an entropy variable. The resultant model is simple and suitable for extensive parametric studies of HCCI engine combustion. Some preliminary results on the effects of mixture and composition stratification on the duration of burning are presented using a presumed Gaussian PDF for the initial temperature distribution. The effects of mixture stratification on the feasible operating conditions is demonstrated using simple criteria to delineate the knocking and incomplete end-gas combustion regimes.

Original languageEnglish (US)
Pages (from-to)1963-1989
Number of pages27
JournalCombustion science and technology
Issue number9
StatePublished - Sep 2007
Externally publishedYes


  • Asymptotic analysis
  • HCCI
  • Ignition
  • Ignition delay and control
  • Inhomogeneity
  • Stratified charge

ASJC Scopus subject areas

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


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