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Title: Hydroxyl time series and recirculation in turbulent nonpremixed swirling flames

Abstract

Time-series measurements of OH, as related to accompanying flow structures, are reported using picosecond time-resolved laser-induced fluorescence (PITLIF) and particle-imaging velocimetry (PIV) for turbulent, swirling, nonpremixed methane-air flames. The [OH] data portray a primary reaction zone surrounding the internal recirculation zone, with residual OH in the recirculation zone approaching chemical equilibrium. Modeling of the OH electronic quenching environment, when compared to fluorescence lifetime measurements, offers additional evidence that the reaction zone burns as a partially premixed flame. A time-series analysis affirms the presence of thin flamelet-like regions based on the relation between swirl-induced turbulence and fluctuations of [OH] in the reaction and recirculation zones. The OH integral time-scales are found to correspond qualitatively to local mean velocities. Furthermore, quantitative dependencies can be established with respect to axial position, Reynolds number, and global equivalence ratio. Given these relationships, the OH time-scales, and thus the primary reaction zone, appear to be dominated by convection-driven fluctuations. Surprisingly, the OH time-scales for these nominally swirling flames demonstrate significant similarities to previous PITLIF results in nonpremixed jet flames. (author)

Authors:
; ; ; ;  [1];  [2]
  1. School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288 (United States)
  2. Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269-3139 (United States)
Publication Date:
OSTI Identifier:
20824156
Resource Type:
Journal Article
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 147; Journal Issue: 1-2; Other Information: Elsevier Ltd. All rights reserved; Journal ID: ISSN 0010-2180
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; TIME-SERIES ANALYSIS; HYDROXYL RADICALS; TURBULENCE; METHANE; AIR; FLAMES; COMBUSTION KINETICS; FLUCTUATIONS; REYNOLDS NUMBER

Citation Formats

Guttenfelder, Walter A, Laurendeau, Normand M, Ji, Jun, King, Galen B, Gore, Jay P, and Renfro, Michael W. Hydroxyl time series and recirculation in turbulent nonpremixed swirling flames. United States: N. p., 2006. Web. doi:10.1016/J.COMBUSTFLAME.2006.08.003.
Guttenfelder, Walter A, Laurendeau, Normand M, Ji, Jun, King, Galen B, Gore, Jay P, & Renfro, Michael W. Hydroxyl time series and recirculation in turbulent nonpremixed swirling flames. United States. https://doi.org/10.1016/J.COMBUSTFLAME.2006.08.003
Guttenfelder, Walter A, Laurendeau, Normand M, Ji, Jun, King, Galen B, Gore, Jay P, and Renfro, Michael W. 2006. "Hydroxyl time series and recirculation in turbulent nonpremixed swirling flames". United States. https://doi.org/10.1016/J.COMBUSTFLAME.2006.08.003.
@article{osti_20824156,
title = {Hydroxyl time series and recirculation in turbulent nonpremixed swirling flames},
author = {Guttenfelder, Walter A and Laurendeau, Normand M and Ji, Jun and King, Galen B and Gore, Jay P and Renfro, Michael W},
abstractNote = {Time-series measurements of OH, as related to accompanying flow structures, are reported using picosecond time-resolved laser-induced fluorescence (PITLIF) and particle-imaging velocimetry (PIV) for turbulent, swirling, nonpremixed methane-air flames. The [OH] data portray a primary reaction zone surrounding the internal recirculation zone, with residual OH in the recirculation zone approaching chemical equilibrium. Modeling of the OH electronic quenching environment, when compared to fluorescence lifetime measurements, offers additional evidence that the reaction zone burns as a partially premixed flame. A time-series analysis affirms the presence of thin flamelet-like regions based on the relation between swirl-induced turbulence and fluctuations of [OH] in the reaction and recirculation zones. The OH integral time-scales are found to correspond qualitatively to local mean velocities. Furthermore, quantitative dependencies can be established with respect to axial position, Reynolds number, and global equivalence ratio. Given these relationships, the OH time-scales, and thus the primary reaction zone, appear to be dominated by convection-driven fluctuations. Surprisingly, the OH time-scales for these nominally swirling flames demonstrate significant similarities to previous PITLIF results in nonpremixed jet flames. (author)},
doi = {10.1016/J.COMBUSTFLAME.2006.08.003},
url = {https://www.osti.gov/biblio/20824156}, journal = {Combustion and Flame},
issn = {0010-2180},
number = 1-2,
volume = 147,
place = {United States},
year = {Sun Oct 15 00:00:00 EDT 2006},
month = {Sun Oct 15 00:00:00 EDT 2006}
}