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dc.contributor.authorZhou, Zhen
dc.contributor.authorShoshin, Yuriy
dc.contributor.authorHernandez Perez, Francisco
dc.contributor.authorvan Oijen, Jeroen A.
dc.contributor.authorde Goey, Laurentius P.H.
dc.date.accessioned2017-10-18T08:57:29Z
dc.date.available2017-10-18T08:57:29Z
dc.date.issued2017-10-13
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.
dc.identifier.issn0010-2180
dc.identifier.doi10.1016/j.combustflame.2017.09.023
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.
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.
dc.publisherElsevier BV
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0010218017303607
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/
dc.subjectLewis number
dc.subjectLean limit
dc.subjectBall-like flame
dc.subjectCell-like flame
dc.titleEffect of Lewis number on ball-like lean limit flames
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.identifier.journalCombustion and Flame
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands
kaust.personHernandez Perez, Francisco
dc.date.published-online2017-10-13
dc.date.published-print2018-02


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