Effect of laser-induced excitation of oxygen on ignition in HCCI engines analysed by numerical simulations

D. L. Flowers*, S. M. Aceves, Robert Dibble

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Lack of proven means to control ignition impedes practical implementation of homogenous charge compression ignition (HCCI) engines. In the present paper, we investigate if laser-induced excitation of oxygen might aid solution of the ignition control problem in HCCI engines. Simulations by previous researchers showed laser-induced excitation of oxygen enhances ignition in supersonic combustion. Based on this previous research, we extend a chemical kinetic mechanism for propane autoignition to include reactions for two excited oxygen states, O2(a1Δg) and O2 (b1σg+). Simulations examined the effect of each of these excited O2 states upon ignition timing in an HCCI engine. Results indicate that achieving useful control of the combustion process requires substantial conversion of O2 to either of the excited states. At the required level of excitation, the power required for the laser may lower engine efficiency.

Original languageEnglish (US)
Pages (from-to)455-468
Number of pages14
JournalCombustion Theory and Modelling
Volume11
Issue number3
DOIs
StatePublished - Jun 1 2007

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Modeling and Simulation
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

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