Soot evolution and flame response to acoustic forcing of laminar non-premixed jet flames at varying amplitudes

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dc.contributor.authorFoo, K.K.
dc.contributor.authorSun, Z.
dc.contributor.authorMedwell, P.R.
dc.contributor.authorAlwahabi, Z.T.
dc.contributor.authorNathan, G.J.
dc.contributor.authorDally, B.B.
dc.date.issued2018
dc.description.abstractNew details regarding the soot evolution and its controlling parameters in steady and forced flames have been studied using high spatial resolution laser diagnostic techniques. Steady laminar non-premixed ethy- lene/nitrogen flames with three different diameters burners were acoustically forced using a loudspeaker. 10-Hz-sinusoidal signals of different amplitudes were transmitted to the loudspeaker to drive the flames. The results reveal that the spatial correlation between the soot field and the temperature profile is in- fluenced by the burner diameter and forcing conditions. The soot field in steady laminar flames is con- fined to a relatively narrow temperature range, 150 0–20 0 0 K. In contradiction, the soot field in forced flames spread across a wider range of temperature, 140 0–210 0 K. Furthermore, the spatial correlation between the normalised soot concentration and primary particle size can be described with an exponen- tial function. While it is observed that the exponential coefficients vary with burner diameter and forcing conditions, further study is necessary for a better understanding. In general, laminar flames forced at a lower amplitude ( α = 25% ) tend to produce less soot than moderately forced ( α = 50% ) flames. Further increasing the forcing amplitude to α = 75% does not increase the soot production in laminar flames; conversely, lower peak and volume-integrated soot volume fraction are observed in the strongly forced flame ( α = 75% ) as relative to the moderately forced counterpart. These findings shed new light on the seemingly contradictory results published in the literature regarding the effect of the forcing intensity on the soot production.
dc.description.statementofresponsibilityKae Ken Foo, Zhiwei Sun, Paul R. Medwell, Zeyad T. Alwahabi, Graham J. Nathan, Bassam B. Dally
dc.identifier.citationCombustion and Flame, 2018; 198:249-259
dc.identifier.doi10.1016/j.combustflame.2018.09.022
dc.identifier.issn0010-2180
dc.identifier.issn1556-2921
dc.identifier.orcidFoo, K.K. [0000-0002-6015-0911]
dc.identifier.orcidSun, Z. [0000-0001-7899-9676]
dc.identifier.orcidMedwell, P.R. [0000-0002-2216-3033]
dc.identifier.orcidAlwahabi, Z.T. [0000-0003-4831-7798]
dc.identifier.orcidNathan, G.J. [0000-0002-6922-848X]
dc.identifier.urihttp://hdl.handle.net/2440/117567
dc.language.isoen
dc.publisherElsevier
dc.relation.granthttp://purl.org/au-research/grants/arc/DP130100198
dc.rights© 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
dc.source.urihttps://doi.org/10.1016/j.combustflame.2018.09.022
dc.subjectAcoustic forcing; laminar non-premixed flame; amplitude; soot volume fraction; primary particle diameter; temperature
dc.titleSoot evolution and flame response to acoustic forcing of laminar non-premixed jet flames at varying amplitudes
dc.typeJournal article
pubs.publication-statusPublished

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