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Type: Journal article
Title: The significance of beam steering on laser-induced incandescence measurements in laminar counterflow flames
Author: Kruse, S.
Medwell, P.R.
Beeckmann, J.
Pitsch, H.
Citation: Applied Physics B: Lasers and Optics, 2018; 124(11):212-1-212-11
Publisher: Springer-Verlag
Issue Date: 2018
ISSN: 0946-2171
Statement of
S. Kruse, P. R. Medwell, J. Beeckmann, H. Pitsch
Abstract: Beam 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.
Description: Published online: 17 October 2018
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.
DOI: 10.1007/s00340-018-7072-0
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