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Influence of spatial laser energy distribution on evaluated soot particle sizes using two-colour laser-induced incandescence in a flat premixed ethylene/air flame

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Abstract

Time-resolved laser-induced incandescence (LII) has been developed rapidly during the last decade as a useful non-intrusive technique for particle size determination. Still several parameters should be investigated in order to improve the accuracy of LII for particle sizing and the spatial distribution of the laser energy is one of these. Generally a top-hat profile is recommended, as this ensures a uniform heating of all particles in the measurement volume. As it is generally not straightforward to create a uniform beam profile, it is of interest to establish the influence of various profiles on the evaluated particle sizes. In this work we present both an experimental and a theoretical investigation of the influence of the spatial profile on evaluated sizes. All experiments were carried out using a newly developed setup for two-colour LII (2C-LII) which provides online monitoring of both the spatial and temporal profile as well as the laser pulse energy. The LII measurements were performed in a one-dimensional premixed sooting ethylene/air flame, and evaluated particle sizes from LII were compared with thermophoretically sampled soot particles analysed using transmission electron microscopy (TEM). The results show that although there is some influence of the spatial laser energy distribution on the evaluated particle sizes both in modelling and experiments, this effect is substantially smaller than the influence of the uncertainties in gas temperature and the thermal accommodation coefficient.

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Authors and Affiliations

  1. Division of Combustion Physics, Lund University, P.O. Box 118, 221 00, Lund, Sweden

    H. Bladh, J. Johnsson & P.-E. Bengtsson

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  1. H. Bladh
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  2. J. Johnsson
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  3. P.-E. Bengtsson
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Correspondence to H. Bladh.

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Bladh, H., Johnsson, J. & Bengtsson, PE. Influence of spatial laser energy distribution on evaluated soot particle sizes using two-colour laser-induced incandescence in a flat premixed ethylene/air flame. Appl. Phys. B 96, 645–656 (2009). https://doi.org/10.1007/s00340-009-3523-y

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  • DOI: https://doi.org/10.1007/s00340-009-3523-y

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