Hydroxyl and Rayleigh scattering time-series measurements in turbulent non-premixed H2/CH4/N2-air jet flames

J. Raguraman, G. B. King, N. M. Laurendeau, M. W. Renfro

Research output: Contribution to conferencePaperpeer-review

Abstract

Hydroxyl laser-induced fluorescence and laser Rayleigh scattering time-series measurements were obtained for a set of five turbulent non-premixed H2/CH4/N2-air jet flames in the range 13,100 < Re < 21,000. For each of the flames, high-repetition rate time-series measurements were made at various axial locations between x/D = 20 and x/D = 40. The autocorrelation functions were self-similar for both the [OH] and LRS measurements, and could be fully characterized by their integral time scales. Integral time scales were computed along the centerline at various axial heights. The density and [OH] time scales portrayed an increase with distance downstream, but the density time scales are always greater than those for [OH] by a factor of two to four. At a fixed peak radial temperature location, the OH integral time scales decreased with increasing Reynolds number as Re-1.41. The density time scales showed a similar trend of Re1.42. Along the jet centerline, for a given Re, the ratio of density to OH integral time scale was largely invariant. However, this ratio rose with increasing Re, suggesting an enhanced reduction in the [OH] time scale owing to more discernable fluctuations of the thin [OH] layer as compared to the wider density layer. Measured [OH] and density time scales were also compared to predicted time scales using mixture fraction simulations. This is an abstract of a paper presented at the 30th International Symposium on combustion (Chicago, IL 7/25-30/2004).

Original languageEnglish
Pages448
Number of pages1
StatePublished - 2004
Event30th International Symposium on Combustion, Abstracts of Works-in-Progress Poster Presentations - Chicago, IL, United States
Duration: Jul 25 2004Jul 30 2004

Conference

Conference30th International Symposium on Combustion, Abstracts of Works-in-Progress Poster Presentations
Country/TerritoryUnited States
CityChicago, IL
Period7/25/047/30/04

ASJC Scopus subject areas

  • Engineering (all)

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