Chain mechanisms in the overall reaction orders in laminar flame propagation

F. N. Egolfopoulos, C. K. Law

Research output: Contribution to journalArticle

163 Scopus citations

Abstract

The laminar flame speeds of methane-oxygen-nitrogen mixtures as functions of the flame temperature Tad and system pressure p have been experimentally determined by using the counterflow, twin-flame technique. These data are then compared with numerically-calculated values obtained by using an independently validated kinetic scheme. Results show that the overall reaction order n and activation energy Ea are far from being constants, that n decreases with increasing p and decreasing Tad whereas Ea increases with increasing p, and that n can actually assume negative values; the last result implies that the mass burning rate of some weakly burning flames may decrease with increasing pressure. By further identifying the crucial reaction steps through sensitivity analysis, the present results are interpreted on the basis of the influence of chain branching-termination mechanisms on the overall reaction rate.

Original languageEnglish (US)
Pages (from-to)7-16
Number of pages10
JournalCombustion and Flame
Volume80
Issue number1
DOIs
StatePublished - Apr 1990

All Science Journal Classification (ASJC) codes

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

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