Numerical simulation of front lobe formation in laser-induced spark ignition of CH4/air mixtures

M. H. Morsy, S. H. Chung

Research output: Contribution to journalConference articlepeer-review

39 Scopus citations

Abstract

Initial flame-kernel development in laser-induced spark ignition has been investigated numerically for methane/air mixtures. Laser energy absorbed by the spark has been simulated accounting for spatial distribution, especially, asymmetric absorption in the laser-beam direction. Results showed that the shock wave generated from the expansion of high-pressure initial kernel propagates rapidly having nearly spherical shape and leaving behind a high-temperature region. A torus-like shape flame kernel propagated radially and a front lobe was formed, which propagated back toward the laser source. These kernel structures were developed due to vortical motions generated by the interaction of pressure field and flow, which stems from the asymmetric deposition of laser energy in the direction of laser. The front lobe was separated from the torus for the lean mixtures, while the lobe and torus were connected for the stoichiometric mixture. The front lobe was extinguished at a later stage for the lean mixture at subatmospheric pressure. The calculated results agreed well with experimental observations.

Original languageEnglish (US)
Pages (from-to)1613-1619
Number of pages7
JournalProceedings of the Combustion Institute
Volume29
Issue number2
DOIs
StatePublished - Jan 1 2002
Event30th International Symposium on Combustion - Chicago, IL, United States
Duration: Jul 25 2004Jul 30 2004

ASJC Scopus subject areas

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

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