Effect of Lewis number on ball-like lean limit flames

Handle URI:
http://hdl.handle.net/10754/625897
Title:
Effect of Lewis number on ball-like lean limit flames
Authors:
Zhou, Zhen; Shoshin, Yuriy; Hernandez Perez, Francisco; van Oijen, Jeroen A.; de Goey, Laurentius P.H. ( 0000-0001-6625-3113 )
Abstract:
The lean limit flames for three different fuel compositions premixed with air, representing three different mixture Lewis numbers, stabilized inside a tube in a downward flow are examined by experiments and numerical simulations. The CH* chemiluminescence distribution in CH4–air and CH4–H2–air flames and the OH* chemiluminescence distribution in H2–air flames are recorded in the experiments. Cell-like flames are observed for the CH4–air mixture for all tested equivalence ratios. However, for CH4–H2–air and H2–air flames, ball-like lean limit flames are observed. Flame temperature fields are measured using Rayleigh scattering. The experimentally observed lean limit flames are predicted qualitatively by numerical simulation with the mixture-averaged transport model and skeletal mechanism of CH4. The results of the simulations show that the entire lean limit flames of CH4–H2–air and H2–air mixtures are located inside a recirculation zone. However, for the lean limit CH4–air flame, only the leading edge is located inside the recirculation zone. A flame structure with negative flame displacement speed is observed for the leading edges of the predicted lean limit flames with all three different fuel compositions. As compared with 1D planar flames, the fuel transport caused by convection is less significant in the present 2D lean limit flames for the three different fuel compositions. For the trailing edges of the three predicted lean limit flames, a diffusion dominated flame structure is observed.
KAUST Department:
Clean Combustion Research Center
Citation:
Zhou Z, Shoshin Y, Hernández-Pérez FE, van Oijen JA, de Goey LPH (2018) Effect of Lewis number on ball-like lean limit flames. Combustion and Flame 188: 77–89. Available: http://dx.doi.org/10.1016/j.combustflame.2017.09.023.
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
13-Oct-2017
DOI:
10.1016/j.combustflame.2017.09.023
Type:
Article
ISSN:
0010-2180
Sponsors:
The financial support of the Dutch Technology Foundation (STW), Project 13549, is gratefully acknowledged. The authors thank Prof. Clinton Groth for providing access to the CFFC (Computational Framework for Fluids and Combustion) code.
Additional Links:
http://www.sciencedirect.com/science/article/pii/S0010218017303607
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorZhou, Zhenen
dc.contributor.authorShoshin, Yuriyen
dc.contributor.authorHernandez Perez, Franciscoen
dc.contributor.authorvan Oijen, Jeroen A.en
dc.contributor.authorde Goey, Laurentius P.H.en
dc.date.accessioned2017-10-18T08:57:29Z-
dc.date.available2017-10-18T08:57:29Z-
dc.date.issued2017-10-13en
dc.identifier.citationZhou Z, Shoshin Y, Hernández-Pérez FE, van Oijen JA, de Goey LPH (2018) Effect of Lewis number on ball-like lean limit flames. Combustion and Flame 188: 77–89. Available: http://dx.doi.org/10.1016/j.combustflame.2017.09.023.en
dc.identifier.issn0010-2180en
dc.identifier.doi10.1016/j.combustflame.2017.09.023en
dc.identifier.urihttp://hdl.handle.net/10754/625897-
dc.description.abstractThe lean limit flames for three different fuel compositions premixed with air, representing three different mixture Lewis numbers, stabilized inside a tube in a downward flow are examined by experiments and numerical simulations. The CH* chemiluminescence distribution in CH4–air and CH4–H2–air flames and the OH* chemiluminescence distribution in H2–air flames are recorded in the experiments. Cell-like flames are observed for the CH4–air mixture for all tested equivalence ratios. However, for CH4–H2–air and H2–air flames, ball-like lean limit flames are observed. Flame temperature fields are measured using Rayleigh scattering. The experimentally observed lean limit flames are predicted qualitatively by numerical simulation with the mixture-averaged transport model and skeletal mechanism of CH4. The results of the simulations show that the entire lean limit flames of CH4–H2–air and H2–air mixtures are located inside a recirculation zone. However, for the lean limit CH4–air flame, only the leading edge is located inside the recirculation zone. A flame structure with negative flame displacement speed is observed for the leading edges of the predicted lean limit flames with all three different fuel compositions. As compared with 1D planar flames, the fuel transport caused by convection is less significant in the present 2D lean limit flames for the three different fuel compositions. For the trailing edges of the three predicted lean limit flames, a diffusion dominated flame structure is observed.en
dc.description.sponsorshipThe financial support of the Dutch Technology Foundation (STW), Project 13549, is gratefully acknowledged. The authors thank Prof. Clinton Groth for providing access to the CFFC (Computational Framework for Fluids and Combustion) code.en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0010218017303607en
dc.rightsNOTICE: 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 Combustion and Flame, 10 October 2017. DOI: 10.1016/j.combustflame.2017.09.023. © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectLewis numberen
dc.subjectLean limiten
dc.subjectBall-like flameen
dc.subjectCell-like flameen
dc.titleEffect of Lewis number on ball-like lean limit flamesen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalCombustion and Flameen
dc.eprint.versionPost-printen
dc.contributor.institutionDepartment of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlandsen
kaust.authorHernandez Perez, Franciscoen
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