Effect of pressure on the lean limit flames of H2-CH4-air mixture in tubes

Handle URI:
http://hdl.handle.net/10754/624985
Title:
Effect of pressure on the lean limit flames of H2-CH4-air mixture in tubes
Authors:
Zhou, Zhen; Shoshin, Yuriy; Hernandez Perez, Francisco; van Oijen, Jeroen A.; de Goey, Laurentius P.H.
Abstract:
The lean limit flames of H2-CH4-air mixtures stabilized inside tubes in a downward flow are experimentally and numerically investigated at elevated pressures ranging from 2 to 5 bar. For the shapes of lean limit flames, a change from ball-like flame to cap-like flame is experimentally observed with the increase of pressure. This experimentally observed phenomenon is qualitatively predicted by numerical simulations. The structure of ball-like and cap-like lean limit flames at all tested pressures is analysed in detail based on the numerical predictions. The results show that the lean limit flames are located inside a recirculation zone at all tested pressures. For the leading edges of the lean limit flames at all tested pressures, the fuel transport is controlled by both convection and diffusion. For the trailing edge of the ball-like lean limit flame at 2 bar, the fuel transport is dominated by diffusion. However, with increasing pressure, the transport contribution caused by convection in the trailing edges of the lean limit flames increases. Finally, the influence of transport and chemistry on the predicted ultra lean flames and lean flammability limit is analysed at elevated pressures.
KAUST Department:
Clean Combustion Research Center
Citation:
Zhou Z, Shoshin Y, Hernández-Pérez FE, van Oijen JA, de Goey LPH (2017) Effect of pressure on the lean limit flames of H 2 -CH 4 -air mixture in tubes. Combustion and Flame 183: 113–125. Available: http://dx.doi.org/10.1016/j.combustflame.2017.05.011.
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
25-May-2017
DOI:
10.1016/j.combustflame.2017.05.011
Type:
Article
ISSN:
0010-2180
Sponsors:
This work was supported by the Dutch Technology Foundation (STW) (project 13549). 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/S0010218017301785
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.accessioned2017-06-14T06:04:47Z-
dc.date.available2017-06-14T06:04:47Z-
dc.date.issued2017-05-25en
dc.identifier.citationZhou Z, Shoshin Y, Hernández-Pérez FE, van Oijen JA, de Goey LPH (2017) Effect of pressure on the lean limit flames of H 2 -CH 4 -air mixture in tubes. Combustion and Flame 183: 113–125. Available: http://dx.doi.org/10.1016/j.combustflame.2017.05.011.en
dc.identifier.issn0010-2180en
dc.identifier.doi10.1016/j.combustflame.2017.05.011en
dc.identifier.urihttp://hdl.handle.net/10754/624985-
dc.description.abstractThe lean limit flames of H2-CH4-air mixtures stabilized inside tubes in a downward flow are experimentally and numerically investigated at elevated pressures ranging from 2 to 5 bar. For the shapes of lean limit flames, a change from ball-like flame to cap-like flame is experimentally observed with the increase of pressure. This experimentally observed phenomenon is qualitatively predicted by numerical simulations. The structure of ball-like and cap-like lean limit flames at all tested pressures is analysed in detail based on the numerical predictions. The results show that the lean limit flames are located inside a recirculation zone at all tested pressures. For the leading edges of the lean limit flames at all tested pressures, the fuel transport is controlled by both convection and diffusion. For the trailing edge of the ball-like lean limit flame at 2 bar, the fuel transport is dominated by diffusion. However, with increasing pressure, the transport contribution caused by convection in the trailing edges of the lean limit flames increases. Finally, the influence of transport and chemistry on the predicted ultra lean flames and lean flammability limit is analysed at elevated pressures.en
dc.description.sponsorshipThis work was supported by the Dutch Technology Foundation (STW) (project 13549). 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/S0010218017301785en
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, 25 May 2017. DOI: 10.1016/j.combustflame.2017.05.011. © 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.subjectUltra leanen
dc.subjectBall-like flameen
dc.subjectCap-like flameen
dc.subjectLow Lewis numberen
dc.titleEffect of pressure on the lean limit flames of H2-CH4-air mixture in tubesen
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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