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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 21 — Jul. 20, 1999
  • pp: 4596–4608

Quantitative hydroxyl concentration time-series measurements in turbulent nonpremixed flames

Michael W. Renfro, Galen B. King, and Normand M. Laurendeau  »View Author Affiliations


Applied Optics, Vol. 38, Issue 21, pp. 4596-4608 (1999)
http://dx.doi.org/10.1364/AO.38.004596


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Abstract

Quantitative hydroxyl concentration time-series measurements have been obtained by picosecond time-resolved laser-induced fluorescence in a series of methane–air and hydrogen–argon–air nonpremixed flames. The recovery of a quantitative time series is complicated by the need to account for fluctuations in the fluorescence lifetime. We have recently developed instrumentation that enables the simultaneous measurement of fluorescence signal and lifetime. The present research represents the first application of this technique to turbulent flames. The correction for hydroxyl lifetime fluctuations is shown to be significant for mean concentrations and thus probability density functions but negligible for power spectral densities (PSD’s). The hydroxyl PSD’s were found to vary slightly with radial and axial location in the flames and to vary significantly with Reynolds number. However, the PSD’s in the H2–Ar–air flames are nearly identical to those in the CH4–air flames.

© 1999 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(280.7060) Remote sensing and sensors : Turbulence
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6500) Spectroscopy : Spectroscopy, time-resolved

History
Original Manuscript: November 30, 1998
Revised Manuscript: April 13, 1999
Published: July 20, 1999

Citation
Michael W. Renfro, Galen B. King, and Normand M. Laurendeau, "Quantitative hydroxyl concentration time-series measurements in turbulent nonpremixed flames," Appl. Opt. 38, 4596-4608 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-21-4596

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