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    Rights statement: This is the author’s version of a work that was accepted for publication in Journal of the Energy Institute. 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 Joural of the Energy Institute, 89, 3, 2016 DOI: 10.1016/j.joei.2015.02.008

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A comparative study of instabilities in forced reacting plumes of nonpremixed flames

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<mark>Journal publication date</mark>08/2016
<mark>Journal</mark>Journal of the Energy Institute
Issue number3
Volume89
Number of pages12
Pages (from-to)456-467
Publication statusPublished
Early online date5/03/15
Original languageEnglish

Abstract

A comparative study has been performed to investigate the flow instabilities and their interaction for nonpremixed methane-air flames using experimental results, numerical simulations and theoretical analyses. The effects of buoyancy and the strong external perturbations on the vortex dynamics and instabilities of forced reacting plumes are studied. Results suggest that the flame surface breaks in forced reacting plumes and two flame fronts are formed eventually due to the convective instability coupled with buoyancy-driven instability. Flame pinch-off could occur in a short time for the cases with the strong perturbations of low frequencies. This indicates that the nonpremixed flame system exhibits a low-pass characteristic, which is sensitive to the low frequency perturbations. In addition, the buoyancy instability can be observed from the comparisons, which is of an absolute unstable nature. Despite the fact that theoretical analyses are derived from the single transport equation for mixture fraction with a number of assumptions, the results are still in good agreement with those obtained from the experiments and numerical simulations.

Bibliographic note

This is the author’s version of a work that was accepted for publication in Journal of the Energy Institute. 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 Joural of the Energy Institute, 89, 3, 2016 DOI: 10.1016/j.joei.2015.02.008