Effects of oxygen index on soot production and temperature in an ethylene inverse diffusion flame

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DOIResolve DOI: http://doi.org/10.1016/j.expthermflusci.2015.09.029
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TypeArticle
Journal titleExperimental Thermal and Fluid Science
ISSN0894-1777
SubjectLaminar inverse diffusion flame; Oxygen index; Soot volume fraction; Soot temperature; Radiant fraction
AbstractAn experimental study was conducted to investigate the effects of the Oxygen Index (OI) in an ethylene laminar inverse diffusion flame (IDF). The OI was varied from 21% to 37% and its influence was measured in terms of the flame height, soot volume fraction, soot temperature and radiant fraction. The stoichiometric flame height was measured by the spontaneous emission of CH∗ radicals and was found to decrease when the OI increases. In contrast, the luminous flame height increases with OI because soot can still form and grow beyond the reaction zone. Radial profiles of soot volume fraction and soot temperature were obtained by means of a Modulated Absorption/Emission (MAE) technique. The line-of-sight intensities, integrated along the optical path and captured by ECCD camera at two wavelengths were inverted using deconvolution and regularization techniques in order to obtain radial profiles of soot volume fraction and temperature. The increase in OI enhances soot volume fraction due to higher temperatures and soot formation rates. Both the local and integrated soot quantities increase with OI. The radiant fraction of IDF increases with the OI in a similar way to the integrated soot volume fraction.
Publication date
LanguageEnglish
AffiliationMeasurement Science and Standards; National Research Council Canada
Peer reviewedYes
IdentifierS0894177715002745
NPARC number21276408
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Record identifierbf352d17-20fa-4751-befb-ee45d925d620
Record created2015-10-09
Record modified2016-05-09
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