Fuel effects on the stability of turbulent flames with compositionally inhomogeneous inlets

Handle URI:
http://hdl.handle.net/10754/622294
Title:
Fuel effects on the stability of turbulent flames with compositionally inhomogeneous inlets
Authors:
Guiberti, T. F.; Juddoo, M.; Lacoste, Deanna; Dunn, M. J.; Roberts, William L. ( 0000-0003-1999-2831 ) ; Masri, A. R.
Abstract:
This paper reports an analysis of the influence of fuels on the stabilization of turbulent piloted jet flames with inhomogeneous inlets. The burner is identical to that used earlier by the Sydney Group and employs two concentric tubes within the pilot stream. The inner tube, carrying fuel, can be recessed, leading to a varying degree of inhomogeneity in mixing with the outer air stream. Three fuels are tested: dimethyl ether (DME), liquefied petroleum gas (LPG), and compressed natural gas (CNG). It is found that improvement in flame stability at the optimal compositional inhomogeneity is highest for CNG and lowest for DME. Three possible reasons for this different enhancement in stability are investigated: mixing patterns, pilot effects, and fuel chemistry. Numerical simulations realized in the injection tube highlight similarities and differences in the mixing patterns for all three fuels and demonstrate that mixing cannot explain the different stability gains. Changing the heat release rates from the pilot affects the three fuels in similar ways and this also implies that the pilot stream is unlikely to be responsible for the observed differences. Fuel reactivity is identified as a key factor in enhancing stability at some optimal compositional inhomogeneity. This is confirmed by inference from joint images of PLIF-OH and PLIF-CHO, collected at a repetition rate of 10kHz in turbulent flames of DME, and from one-dimensional calculations of laminar flames using detailed chemistry for DME, CNG, and LPG.
KAUST Department:
Clean Combustion Research Center
Citation:
Guiberti TF, Juddoo M, Lacoste DA, Dunn MJ, Roberts WL, et al. (2016) Fuel effects on the stability of turbulent flames with compositionally inhomogeneous inlets. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2016.08.051.
Publisher:
Elsevier BV
Journal:
Proceedings of the Combustion Institute
Issue Date:
11-Oct-2016
DOI:
10.1016/j.proci.2016.08.051
Type:
Article
ISSN:
1540-7489
Sponsors:
Australian Research Council
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorGuiberti, T. F.en
dc.contributor.authorJuddoo, M.en
dc.contributor.authorLacoste, Deannaen
dc.contributor.authorDunn, M. J.en
dc.contributor.authorRoberts, William L.en
dc.contributor.authorMasri, A. R.en
dc.date.accessioned2017-01-02T09:08:24Z-
dc.date.available2017-01-02T09:08:24Z-
dc.date.issued2016-10-11en
dc.identifier.citationGuiberti TF, Juddoo M, Lacoste DA, Dunn MJ, Roberts WL, et al. (2016) Fuel effects on the stability of turbulent flames with compositionally inhomogeneous inlets. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2016.08.051.en
dc.identifier.issn1540-7489en
dc.identifier.doi10.1016/j.proci.2016.08.051en
dc.identifier.urihttp://hdl.handle.net/10754/622294-
dc.description.abstractThis paper reports an analysis of the influence of fuels on the stabilization of turbulent piloted jet flames with inhomogeneous inlets. The burner is identical to that used earlier by the Sydney Group and employs two concentric tubes within the pilot stream. The inner tube, carrying fuel, can be recessed, leading to a varying degree of inhomogeneity in mixing with the outer air stream. Three fuels are tested: dimethyl ether (DME), liquefied petroleum gas (LPG), and compressed natural gas (CNG). It is found that improvement in flame stability at the optimal compositional inhomogeneity is highest for CNG and lowest for DME. Three possible reasons for this different enhancement in stability are investigated: mixing patterns, pilot effects, and fuel chemistry. Numerical simulations realized in the injection tube highlight similarities and differences in the mixing patterns for all three fuels and demonstrate that mixing cannot explain the different stability gains. Changing the heat release rates from the pilot affects the three fuels in similar ways and this also implies that the pilot stream is unlikely to be responsible for the observed differences. Fuel reactivity is identified as a key factor in enhancing stability at some optimal compositional inhomogeneity. This is confirmed by inference from joint images of PLIF-OH and PLIF-CHO, collected at a repetition rate of 10kHz in turbulent flames of DME, and from one-dimensional calculations of laminar flames using detailed chemistry for DME, CNG, and LPG.en
dc.description.sponsorshipAustralian Research Councilen
dc.publisherElsevier BVen
dc.subjectFlame stabilityen
dc.subjectInhomogeneous inletsen
dc.subjectPiloted flamesen
dc.subjectTurbulent flamesen
dc.titleFuel effects on the stability of turbulent flames with compositionally inhomogeneous inletsen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalProceedings of the Combustion Instituteen
dc.contributor.institutionSchool of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006 Australiaen
kaust.authorGuiberti, T. F.en
kaust.authorLacoste, Deannaen
kaust.authorRoberts, William L.en
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