The significance of beam steering on laser-induced incandescence measurements in laminar counterflow flames

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dc.contributor.authorKruse, S.
dc.contributor.authorMedwell, P.R.
dc.contributor.authorBeeckmann, J.
dc.contributor.authorPitsch, H.
dc.date.issued2018
dc.descriptionPublished online: 17 October 2018
dc.description.abstractBeam steering is often encountered in laser diagnostic measurements, especially in flame environments, due to changes in refractive index caused by thermal and species gradients. It can negatively affect the accuracy of the results. In this work, the effects of beam steering on laser-induced incandescence (LII) measurements of pre-vaporized-liquid counterflow flames are assessed. The focus on counterflow flames is to facilitate future detailed experimental campaigns on one-dimensional nonpremixed sooty flames. It is found that the temperature and species gradients in the counterflow configuration have a much more significant impact on the beam profile than in laminar flat flames, especially for heavier fuels. As a result of the changes in the beam profile, for the same applied laser energy, the local fluence shifts markedly with fuel type, therefore, having a direct impact on the LII measurements. A procedure is developed for ensuring accurate measurements and it is shown that, for a specific fuel, it is possible to tailor the laser energy, such that the collected LII signal in the counterflow flames is nearly independent of beam-steering effects.
dc.description.statementofresponsibilityS. Kruse, P. R. Medwell, J. Beeckmann, H. Pitsch
dc.identifier.citationApplied Physics B: Lasers and Optics, 2018; 124(11):212-1-212-11
dc.identifier.doi10.1007/s00340-018-7072-0
dc.identifier.issn0946-2171
dc.identifier.issn1432-0649
dc.identifier.orcidMedwell, P.R. [0000-0002-2216-3033]
dc.identifier.urihttp://hdl.handle.net/2440/123337
dc.language.isoen
dc.publisherSpringer-Verlag
dc.relation.granthttp://purl.org/au-research/grants/arc/DP170101013
dc.rights© The Author(s) 2018. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creat iveco mmons .org/licen ses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
dc.source.urihttps://doi.org/10.1007/s00340-018-7072-0
dc.titleThe significance of beam steering on laser-induced incandescence measurements in laminar counterflow flames
dc.typeJournal article
pubs.publication-statusPublished

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