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dc.contributor.authorZhu, Xuren
dc.contributor.authorKhateeb, Abdulrahman A.
dc.contributor.authorRoberts, William L.
dc.contributor.authorGuiberti, Thibault
dc.date.accessioned2021-06-08T09:03:48Z
dc.date.available2021-06-08T09:03:48Z
dc.date.issued2021-06-07
dc.date.submitted2021-02-18
dc.identifier.citationZhu, X., Khateeb, A. A., Roberts, W. L., & Guiberti, T. F. (2021). Chemiluminescence signature of premixed ammonia-methane-air flames. Combustion and Flame, 231, 111508. doi:10.1016/j.combustflame.2021.111508
dc.identifier.issn0010-2180
dc.identifier.doi10.1016/j.combustflame.2021.111508
dc.identifier.urihttp://hdl.handle.net/10754/669448
dc.description.abstractThis paper reports on the chemiluminescence footprint of premixed ammonia-methane-air flames. The chemiluminescence spectrum of laminar twin-flames stabilized with a counterflow burner were measured between 200 and 457 nm for large ranges of equivalence ratio (0.60 ≤ ϕ ≤ 1.30), ammonia fraction (pure methane to pure ammonia), and strain rate (55/s ≤ a ≤ 300/s). Relevant excited radicals were identified, namely, NO*, OH*, NH*, CN*, CH*, and CO2* and evolutions of their chemiluminescence intensity were analyzed as a function of equivalence ratio, ammonia fraction, and strain rate. These measurements produced an unprecedented database on the chemiluminescence of ammonia-methane-air flames, which could be used in the future for model validation. A total of 15 ratios of chemiluminescence intensity were also considered and 5 ratios showing promise for the development of chemiluminescence-based flame sensors were identified. The CN*/OH* ratio is a potential surrogate for equivalence ratio even if the ammonia fuel fraction in the fuel blend is not known accurately – as long as it exceeds 0.3 by volume. The CN*/NO* ratio is another possible surrogate for equivalence ratio if the ammonia fraction in the fuel blend is below 0.5. The OH*/CH* ratio, often used to sense equivalence ratio in hydrocarbons flames, is not recommended for ammonia-methane flames. The NH*/CN* ratio is a potential surrogate for the ammonia fraction in the fuel blend if equivalence ratio is larger than ϕ = 0.7 and if the ammonia fraction in the fuel blend is below 0.4. Other ratios may be combined to provide a simultaneous measure of equivalence ratio and ammonia fraction in the fuel blend with an extended range of validity, for example NH*/OH* and CN*/NH*.
dc.description.sponsorshipThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST) under grant number BAS/1/1370-01-01. We thank Prof. G. Magnotti from KAUST for his contribution to the burner design.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0010218021002510
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, [231, , (2021-06-07)] DOI: 10.1016/j.combustflame.2021.111508 . © 2021. 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.titleChemiluminescence signature of premixed ammonia-methane-air flames
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmenthigh-pressure combustion (HPC) Research Group
dc.identifier.journalCombustion and Flame
dc.rights.embargodate2023-06-07
dc.eprint.versionPost-print
dc.identifier.volume231
dc.identifier.pages111508
kaust.personZhu, Xuren
kaust.personKhateeb, Abdulrahman A.
kaust.personRoberts, William L.
kaust.personGuiberti, Thibault
kaust.grant.numberBAS/1/1370-01-01
dc.date.accepted2021-05-12
refterms.dateFOA2021-06-08T11:28:38Z
kaust.acknowledged.supportUnitBAS
dc.date.published-online2021-06-07
dc.date.published-print2021-09


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