Temperature imaging in nonpremixed flames by joint filtered Rayleigh and Raman scattering

Sean P. Kearney, Robert W. Schefer, Steven J. Beresh, Thomas W. Grasser

Research output: Contribution to journalArticlepeer-review

Abstract

Joint fuel Raman and filtered Rayleigh-scattering (FRS) imaging is demonstrated in a laminar methane-air diffusion flame. These experiments are, to our knowledge, the first reported extension of the FRS technique to nonpremixed combustion. This joint imaging approach allows for correction of the FRS images for the large variations in Rayleigh cross section that occur in diffusion flames and for a secondary measurement of fuel mole fraction. The temperature-dependent filtered Rayleigh cross sections are computed with a six-moment kinetic model for calculation of major-species Rayleigh-Brillouin line shapes and a flamelet-based model for physically judicious estimates of gas-phase chemical composition. Shot-averaged temperatures, fuel mole fractions, and fuel number densities from steady and vortex-strained diffusion flames stabilized on a Wolfhard-Parker slot burner are presented, and a detailed uncertainty analysis reveals that the FRS-measured temperatures are accurate to within ±4.5 to 6% of the local absolute temperature.

Original languageEnglish (US)
Pages (from-to)1548-1558
Number of pages11
JournalApplied Optics
Volume44
Issue number9
DOIs
StatePublished - Mar 20 2005
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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