Raman-LIF measurements of temperature, major species, OH, and NO in a methane-air Bunsen flame

Quang Viet Nguyen, R. W. Dibble, C. D. Carter, G. J. Fiechtner, R. S. Barlow

Research output: Contribution to journalArticlepeer-review

120 Scopus citations


Nonintrusive measurements of temperature, the major species (N2, O2, H2, H2O, CO2, CO, CH4), OH, and NO in an atmospheric pressure, laminar methane air Bunsen flame were obtained using a combination of Raman Rayleigh scattering and laser-induced fluorescence. Radial profiles were measured at three axial locations for an equivalence ratio of 1.38. Measurements along the centerline of the flame, for equivalence ratios of 1.38, 1.52, and 1.70, were also obtained. The measurements indicate that the inner unburned fuel- air mixture experiences significant preheating as it travels up into the conical flame zone surrounding it. Consequently, the centerline axial temperatures were typically 100-150 K higher than predicted by adiabatic equilibrium for reactants at an initial temperature of 300 K. Because the amount of preheating increases with the equivalence ratio (due to the increased inner flame height), the maximum temperatures (2000 K) in a Bunsen flame were rather insensitive to the stoichiometry. We observed a 20% reduction of the maximum NO concentrations (80 ppm) in a Bunsen flame by increasing the equivalence ratio from 1.38 to 1.70. We also find that using a one-dimensional premixed laminar flame model incorporating finite-rate chemistry, satisfactorily predicts properties such as the temperature, CO, OH, and NO concentrations at the inner flame.

Original languageEnglish (US)
Pages (from-to)499-510
Number of pages12
JournalCombustion and Flame
Issue number4
StatePublished - Jun 1996
Externally publishedYes

ASJC Scopus subject areas

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


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