Sensitivity analysis for in-cylinder soot-particle size imaging with laser-induced incandescenceReportar como inadecuado

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1 IFPEN - IFP Energies nouvelles 2 Ecole Centrale Paris 3 University of Duisburg-Essen Duisburg

Abstract : 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.

Keywords : Laser-induced incandescence Soot particle-size imaging Diffusion flame Spray combustion Diesel Engine Cylinder Distribution

Autor: E Cenker - G Bruneaux - T Dreier - C Schulz -



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