Simultaneous imaging of OH, formaldehyde, and temperature of turbulent nonpremixed jet flames in a heated and diluted coflow

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dc.contributor.authorMedwell, P.
dc.contributor.authorKalt, P.
dc.contributor.authorDally, B.
dc.date.issued2007
dc.description.abstractThis paper reports measurements in turbulent nonpremixed CH4/H2 jet flames issuing into a heated and highly diluted coflow. These conditions emulate those of moderate or intense low-oxygen-dilution (MILD) combustion. The spatial distribution of the hydroxyl radical (OH), formaldehyde (H2CO), and temperature, imaged using planar laser-induced fluorescence and Rayleigh scattering laser diagnostic techniques, are measured and presented. Comparisons are made between three jet Reynolds numbers and two coflow O2 levels. Measurements are taken at two downstream locations. The burner used in this work facilitates the additional study on the effects of the entrainment of surrounding air on the flame structure at downstream locations. Reducing the coflow oxygen level is shown to lead to a suppression of OH as a result of the reduced temperatures in the reaction zone. Decreasing the oxygen level of the coflow also results in a broadening of the OH distribution. At downstream locations, the surrounding air mixes with the jet and coflow. The subsequent drop in the temperature of the oxidant stream can lead to a rupture of the OH layer. Localized extinction allows premixing of the fuel with the surrounding air. The result is an increase in the reaction rate, highlighting the need for homogeneous mixing to maintain MILD combustion conditions.
dc.description.statementofresponsibilityPaul R. Medwell, Peter A.M. Kalt and Bassam B. Dally
dc.identifier.citationCombustion and Flame, 2007; 148(1-2):48-61
dc.identifier.doi10.1016/j.combustflame.2006.10.002
dc.identifier.issn0010-2180
dc.identifier.issn1556-2921
dc.identifier.orcidMedwell, P. [0000-0002-2216-3033]
dc.identifier.urihttp://hdl.handle.net/2440/35426
dc.language.isoen
dc.publisherElsevier Science Inc
dc.rights© 2006 The Combustion Institute. Published by Elsevier Inc. All rights reserved
dc.source.urihttps://doi.org/10.1016/j.combustflame.2006.10.002
dc.subjectMILD
dc.subjectNonpremixed
dc.subjectOH
dc.subjectFormaldehyde
dc.subjectRayleigh
dc.titleSimultaneous imaging of OH, formaldehyde, and temperature of turbulent nonpremixed jet flames in a heated and diluted coflow
dc.typeJournal article
pubs.publication-statusPublished

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