Extended flammability limits of n-heptane/air mixtures with cool flames

Wenkai Liang, Chung K. Law

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


A numerical and theoretical investigation has been conducted on the flammability limits of n-heptane/air mixtures by considering the role of the cool flame chemistry. It is found that the existence of the cool flame can substantially extend the lean and rich limits of the conventional high-temperature flame. Different levels of kinetic criteria based on the controlling branching and termination reactions at low temperatures are derived and shown to agree well with the numerical results at normal and elevated pressures. Furthermore, the critical temperature of cool flame flammability limits at normal pressure is found to be around 600 K and is insensitive to pressure variations.

Original languageEnglish (US)
Pages (from-to)75-81
Number of pages7
JournalCombustion and Flame
StatePublished - 2017

All Science Journal Classification (ASJC) codes

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


  • Flammability limit
  • Premixed cool flame
  • n-Heptane


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