Experimental and modeling study of laminar flame speed and non-premixed counterflowignition of «-heptane

A. J. Smallbone, W. Liu, C. K. Law, X. Q. You, H. Wang

Research output: Contribution to journalConference article

73 Scopus citations

Abstract

Laminar flame speeds were determined for n-heptane-oxygen-nitrogen mixtures over the pressure range of 0.5-2 atm and equivalence ratio range of 0.7-1.4, using the counterflow twin-flame technique. For pressure at or below 1.5 atm, the laminar flame speeds were collected for n-heptane-air mixtures, whereas the data at 2 atm are reported for diluted air of 18% O2-82% N 2. These experimental data, together with those acquired previously on the non-premixed counterflow ignition temperature of n-heptane determined over the same range of pressure, were simulated with a high-temperature, detailed kinetic model of n-heptane oxidation. After demonstrating satisfactory comparison between the model and experiment, the influence of pressure-induced kinetic effects on the laminar mass flux was analyzed through a computational determination of the overall reaction order. The non-premixed ignition temperature responses were in addition analyzed by numerical sensitivity analysis on reaction kinetics and fuel diffusion rate. The influence of uncertainties in the molecular transport on the model prediction of diffusive ignition is discussed.

Original languageEnglish (US)
Pages (from-to)1245-1252
Number of pages8
JournalProceedings of the Combustion Institute
Volume32 I
Issue number1
DOIs
StatePublished - 2009
Event32nd International Symposium on Combustion - Montreal, QC, Canada
Duration: Aug 3 2008Aug 8 2008

All Science Journal Classification (ASJC) codes

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

Keywords

  • Elevated pressure and temperature
  • Kinetic mechanism
  • Non-premixed counterflow ignition temperatures
  • Premixed laminar flame speeds
  • n-heptane

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