Investigation of laminar pressurized flames for soot model validation using SV-CARS and LII
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Date
2005
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Abstract
Quasi-simultaneous measurements of temperature and soot volume fraction in pressurized and atmospheric
flames are presented. A dual-flame burner concept yielded stable laminar flames for a variety of
equivalence ratios, pressures, and fuels, and permitted the investigation of flames without the influence
of soot oxidation. A CARS-based technique (shifted vibrational CARS) for temperature measurements,
which offers high accuracy over the entire relevant temperature and soot concentration range, is described.
Comparison of temperature measurements in the nonsooting part of a laminar diffusion flame at atmospheric
pressure by SV-CARS and conventional N2 Q-branch CARS yielded excellent agreement. This
new technique was applied to quasi-1D laminar flames with soot concentrations up to 10 ppm and pressures
up to 5 bar. The temperature profiles measured in these flames were combined with soot concentration
measurements using LII; calibration and correction for signal trapping yielded quantitative soot
volume fraction data. The temperature and soot concentration data were combined to generate a comprehensive
dataset for the validation of an improved kinetic soot model for the prediction of soot formation in
premixed combustion at elevated pressure.
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Keywords
Laser diagnostics, Pressurized flames, Laminar premixed