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dc.contributor.authorXu, Lei
dc.contributor.authorYan, Fuwu
dc.contributor.authorWang, Yu
dc.contributor.authorChung, Suk Ho
dc.date.accessioned2019-12-12T08:02:29Z
dc.date.available2019-12-12T08:02:29Z
dc.date.issued2019-12-02
dc.identifier.citationXu, L., Yan, F., Wang, Y., & Chung, S. H. (2020). Chemical effects of hydrogen addition on soot formation in counterflow diffusion flames: Dependence on fuel type and oxidizer composition. Combustion and Flame, 213, 14–25. doi:10.1016/j.combustflame.2019.11.011
dc.identifier.doi10.1016/j.combustflame.2019.11.011
dc.identifier.urihttp://hdl.handle.net/10754/660541
dc.description.abstractWe experimentally studied and kinetically modeled the effects of hydrogen addition on soot formation in methane and ethylene counterflow diffusion flames (CDFs). To isolate the chemical effects of hydrogen in such flames, we also ran a set of experiments on flames of the same base fuels but with the addition of helium. Specifically, we measured the soot volume fractions of the flames using the planar laser-induced incandescence technique. We simulated detailed sooting structures by coupling the gas-phase chemistry with the polycyclic aromatic hydrocarbon (PAH)-based soot model, using a sectional method to resolve the soot particle dynamics. Our experimental and numerical results show that hydrogen chemically inhibits soot formation in ethylene CDFs. While in methane flames, it is interesting to observe that the difference in soot production between the hydrogen- and helium-doped cases became much smaller when the oxygen concentration in the oxidizer stream (XO) was reduced. This suggests that for methane CDFs the chemical soot-inhibiting effects of hydrogen was highly dependent on oxidizer composition (i.e., XO). Explanations are provided through detailed kinetic analysis concerning the effects of hydrogen addition on the growth of PAH, soot inception, and soot surface growth processes. Our results suggest that hydrogen's chemical role in soot formation not only depends on fuel type (ethylene or methane), it also may be sensitive to oxidizer composition.
dc.description.sponsorshipThis work was supported by the National Key R&D Program of China (2017YFC0211201), National Natural Science Foundation of China (51976142 and 51606136), the National Engineering Laboratory for Mobile Source Emission Control Technology (NELM2018A11) and Fundamental Research Funds for the Central Universities (WUT: 2017YB024). SHC was supported by King Abdullah University of Science and Technology.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0010218019305164
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, [[Volume], [Issue], (2019-12-02)] DOI: 10.1016/j.combustflame.2019.11.011 . © 2019. 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.titleChemical effects of hydrogen addition on soot formation in counterflow diffusion flames: Dependence on fuel type and oxidizer composition
dc.typeArticle
dc.contributor.departmentCombustion and Laser Diagnostics Laboratory
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalCombustion and Flame
dc.eprint.versionPost-print
dc.contributor.institutionHubei Key Laboratory of Advanced Technology for Automotive Components, School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, PR China
dc.contributor.institutionHubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, PR China
kaust.personChung, Suk Ho
refterms.dateFOA2019-12-17T06:20:50Z
dc.date.published-online2019-12-02
dc.date.published-print2020-03


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