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Applied Optics

Applied Optics


  • Vol. 44, Iss. 9 — Mar. 21, 2005
  • pp: 1548–1558

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

Sean P. Kearney, Robert W. Schefer, Steven J. Beresh, and Thomas W. Grasser  »View Author Affiliations

Applied Optics, Vol. 44, Issue 9, pp. 1548-1558 (2005)

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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.

© 2005 Optical Society of America

Original Manuscript: August 27, 2004
Revised Manuscript: November 11, 2004
Manuscript Accepted: November 17, 2004
Published: March 20, 2005

Sean P. Kearney, Robert W. Schefer, Steven J. Beresh, and Thomas W. Grasser, "Temperature imaging in nonpremixed flames by joint filtered Rayleigh and Raman scattering," Appl. Opt. 44, 1548-1558 (2005)

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