Abstract
The global aim of this paper consists of quantifying the effect of optically thick media on LII measurements. The paper emphasises in a simple, general two-phase case, the potential “signal trapping” due to the multiple scattering of light by soot particles. A statistical Monte Carlo approach has been used in the frame of a parametric study. This method allows testing separately the distinct influences of parameters like soot volume fraction, sphere diameter, optical path length or aggregate shape. As a first result of this numerical study, the theoretical validity range of experimental techniques can be determined when applied to a larger domain than the strictly optically thin one.
A numerical tool for a better understanding of mixed and complex phenomena has been realised. Here the approach is validated on the simplest geometrical configuration; it will be applied to a real combustion chamber configuration later.
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Chen, L., Garo, A., Cen, K. et al. Numerical simulation of soot optical diagnostics in non-optically thin media. Appl. Phys. B 87, 739–747 (2007). https://doi.org/10.1007/s00340-007-2646-2
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DOI: https://doi.org/10.1007/s00340-007-2646-2