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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Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - A comparative study of instabilities in forced reacting plumes of nonpremixed flames
AU - Jiang, Jieyu
AU - Jing, Liyue
AU - Zhu, Min
AU - Jiang, Xi
N1 - 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
PY - 2016/8
Y1 - 2016/8
N2 - 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.
AB - 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.
KW - Plumes
KW - Flame instability
KW - Vortical structure
KW - Low-pass characteristic
U2 - 10.1016/j.joei.2015.02.008
DO - 10.1016/j.joei.2015.02.008
M3 - Journal article
VL - 89
SP - 456
EP - 467
JO - Journal of the Energy Institute
JF - Journal of the Energy Institute
SN - 1743-9671
IS - 3
ER -