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Article Dans Une Revue Applied Physics B - Laser and Optics Année : 2015

Sensitivity analysis for in-cylinder soot-particle size imaging with laser-induced incandescence

Résumé

Soot particle sizes can be determined from time-resolved laser-induced incandescence (LII) in point measurements where full signal traces are detected. For instantaneous imaging, strategies are required that must cope with time-gated information and that rely on assumptions on the local boundary conditions. A model-based analysis is performed to identify the dependence of LII particle-size imaging on the assumed boundary conditions such as bath gas temperature, pressure, particle heat-up temperature, accommodation coefficients, and soot morphology. Various laser-fluence regimes and gas pressures are considered. For 60 bar, fluences that lead to particle heat-up temperatures of 3400– 3900 K provided the lowest sensitivity on particle-sizing. Effects of laser attenuation are evaluated. A combination of one detection gate starting at the signal peak and the other starting with 5 ns delay was found to provide the highest sensitivity at 60 bar. The optimum gate delays for different pressures are shown. The effects of timing jitter and poly-dispersity are investigated. Systematic errors in pyrometry imaging at 60 bar is evaluated.
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Dates et versions

hal-01174701 , version 1 (09-07-2015)

Identifiants

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E Cenker, G Bruneaux, T Dreier, C Schulz. Sensitivity analysis for in-cylinder soot-particle size imaging with laser-induced incandescence. Applied Physics B - Laser and Optics, 2015, 119 (4), pp.745-763. ⟨10.1007/s00340-015-6009-0⟩. ⟨hal-01174701⟩
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