Direct numerical simulation of extinction and reignition in a nonpremixed turbulent ethylene jet flame

D. O. Lignell, J. H. Chen, T. Lu, C. K. Law

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Direct numerical simulation of a nonpremixed, turbulent, ethylene jet flame is performed to investigate fundamental mechanisms of extinction and reignition processes. A reduced ethylene mechanism consisting of nineteen transported and ten quasi-steady state species, with 167 reactions was used, along with mixture averaged transport properties. The flow configuration is a temporally-evolving slot jet at a Reynolds number of 5,120. Extreme extinction of the nonpremixed flame occurs, followed by a period of intense turbulent scalar mixing between reactants and quenched products in which less than 2stratified mixture with nonhomogeneous composition and temperature. Various modes of reignition are analyzed-autoignition, edge flame propagation, and premixed flame propagation-by monitoring Takeno's flame index [H. Yamashitia, M. Shimada, and T. Takeno, Proc. Combust. Inst., 26 (1996) 27-34], homogeneous ignition delay times by sampling the mixture prior to reignition, and the turbulent displacement speed of the reaction front. The dominant reignition mechanism is found to be premixed flame propagation commencing from a few high temperature flame kernels which survive near global extinction.

Original languageEnglish (US)
Title of host publicationWestern States Section/Combustion Institute Fall Meeting 2007
PublisherWestern States Section/Combustion Institute
Pages755-774
Number of pages20
ISBN (Electronic)9781605609881
StatePublished - Jan 1 2007
EventWestern States Section/Combustion Institute Fall Meeting 2007 - Livermore, United States
Duration: Oct 16 2007Oct 17 2007

Publication series

NameWestern States Section/Combustion Institute Fall Meeting 2007
Volume2

Other

OtherWestern States Section/Combustion Institute Fall Meeting 2007
CountryUnited States
CityLivermore
Period10/16/0710/17/07

All Science Journal Classification (ASJC) codes

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

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    Lignell, D. O., Chen, J. H., Lu, T., & Law, C. K. (2007). Direct numerical simulation of extinction and reignition in a nonpremixed turbulent ethylene jet flame. In Western States Section/Combustion Institute Fall Meeting 2007 (pp. 755-774). (Western States Section/Combustion Institute Fall Meeting 2007; Vol. 2). Western States Section/Combustion Institute.