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titleCorrelation of optical emission and turbulent length scale in a coaxial jet diffusion flame
Author(jpn)松山, 新吾
Author(eng)Matsuyama, Shingo
Author Affiliation(jpn)宇宙航空研究開発機構航空本部(JAXA)
Author Affiliation(eng)Institute of Aeronautical Technology, Japan Aerospace Exploration Agency (JAXA)
Issue Date2014-04
PublisherElsevier Combustion Institute
Publication titleCombustion and Flame
Start page937
End page949
Publication date2014-04
AbstractThis article investigates the correlation between optical emission and turbulent length scale in a coaxial jet diffusion flame. To simulate the H2O emission from an H2/O2 diffusion flame, radiative transfer is calculated on flame data obtained by numerical simulation. H2O emission characteristics are examined for a one-dimensional opposed-flow diffusion flame. The results indicate that H2O emission intensity is linearly dependent on flame thickness. The simulation of H2O emission is then extended to an H2/O2 turbulent coaxial jet diffusion flame. Time series data for a turbulent diffusion flame are obtained by Large Eddy Simulation, and radiative transfer calculations are conducted on the LES results to simulate H2O emission optical images. The length scales of visible structures in the simulated emission images are determined by the procedure proposed by Ivancic and Mayer (2002) [8]. The length scales of emission intensity are compared with the integral length scales of velocity and temperature evaluated from LES flowfield data. The results clearly indicate that the length scale of emission intensity agrees well with the integral length scale of temperature, and is also close to that of the radial velocity component. Finally, the explanation as to why the integral length scale of temperature can be extracted from emission intensity distributions is stated.
KeywordsH2O emission; Integral length scale; Turbulent diffusion flame; Large Eddy Simulation; OH* chemiluminescence; Cryogenic rocket combustion
Document TypeJournal Article
JAXA Category学術雑誌論文
Rights(C) 2013 The Combustion Institute. Published by Elsevier Inc. || NOTICE: this is the author's version of a work that was accepted for publication in Combustion and flame. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in PUBLICATION, Volume 161, Issue 4, 2014, DOI:10.1016/j.combustflame.2013.10.009

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