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dc.contributor.authorFan, Luming
dc.contributor.authorTian, Bo
dc.contributor.authorChong, Cheng Tung
dc.contributor.authorJaafar, Mohammad Nazri Mohd
dc.contributor.authorTanno, Kenji
dc.contributor.authorMcGrath, Dante
dc.contributor.authorOliveira, Pedro M.de
dc.contributor.authorRogg, Bernd
dc.contributor.authorHochgreb, Simone
dc.date.accessioned2021-04-30T08:33:54Z
dc.date.available2021-04-30T08:33:54Z
dc.date.issued2021-07-31
dc.identifier.citationFan, L., Tian, B., Chong, C.T., Jaafar, M.N.M., Tanno, K., McGrath, D., de Oliveira, P.M., Rogg, B. and Hochgreb, S., (2021). 'The effect of fine droplets on laminar propagation speed of a strained acetone-methane flame: Experiment and simulations'. Combustion and Flame, 229, pp. 1-16.en_US
dc.identifier.issn00102180
dc.identifier.doi10.1016/j.combustflame.2021.02.023
dc.identifier.urihttp://hdl.handle.net/10545/625746
dc.description.abstractIn this study, we investigate the effect of the presence of fuel droplets, their size and concentration, on stretched laminar flame speeds. We consider premixed strained methane/air mixtures, with the addition of small acetone droplets, and compare the flame velocity field behaviour to that of the fully vaporized mixture. An impinging stagnation flame configuration is used, to which a narrowly distributed polydisperse mist of acetone droplets is added. Total acetone molar concentrations between 9% and 20% per mole of methane are used, corresponding to 18.6% and 41.4% of the total fuel energy. The Sauter Mean Diameter (SMD) of acetone droplets is varied from 1.0 to 4.7 μm by carefully tuning the air flow rate passing through an atomizer. The droplet size distribution is characterized by a Phase Doppler Anamometry (PDA) system at the outlet of the burner. The flame propagation speed is measured using Particle Image Velocimetry (PIV) for overall equivalence ratios ranging from 0.8 to 1.4 at various strain rates, and the result is compared with a reference case in which acetone was fully vaporized. Unlike the fully vaporized flame, a two-stage reaction flame structure is observed for all droplet cases: a blue premixed flame front followed by a reddish luminous zone. Comparison of the results between gas-only and droplet-laden cases shows that the mean reference burning velocity of the mixture is significantly enhanced when droplets are present under rich cases, whereas the opposite is true for stoichiometric and lean cases. The mean droplet size also changes the relationship between flame speed and strain rate, especially for rich cases. The result suggests that with typical conditions found in laminar strained flames, even for the finest droplets that may have been vaporized before reaching the flame front, the resulting inhomogeneities may lead the flame to behaves differently from the well-premixed gaseous counterpart. Simulations at similar conditions are performed using a two-phase counterflow flame model to compare with experimental data. Model results of reference velocities do not compare well with observations, and the possible reasons for this behaviour are discussed, including the difficulties in determining the pre-vaporization process and thus the boundary conditions, as well as the fidelity of the current point-source based 1D model.en_US
dc.description.sponsorshipN/Aen_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.urlhttps://www.repository.cam.ac.uk/handle/1810/317973en_US
dc.relation.urlhttps://www.sciencedirect.com/science/article/pii/S0010218021000924en_US
dc.rights© 2021 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
dc.subjectAerosol Spraysen_US
dc.subjectLaminar flameen_US
dc.subjectPIVen_US
dc.titleThe effect of fine droplets on laminar propagation speed of a strained acetone-methane flame: Experiment and simulationsen_US
dc.typeArticleen_US
dc.contributor.departmentUniversity of Derbyen_US
dc.contributor.departmentUniversity of Cambridgeen_US
dc.identifier.journalCombustion and Flameen_US
dc.identifier.eid1-s2.0-S0010218021000924
dc.identifier.piiS0010-2180(21)00092-4
dc.source.journaltitleCombustion and Flame
dc.source.volume229
dc.source.beginpage111377
dcterms.dateAccepted2021-02-19
dc.author.detail786969en_US


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