Investigation of laminar pressurized flames for soot model validation using SV-CARS and LII

• Published in: Proceedings of the Combustion Institute 2005, Vol.30 (1), p.1645-1653
• Main Authors: Geigle, Klaus Peter, Schneider-Kühnle, Yorck, Tsurikov, Michael S., Hadef, Redjem, Lückerath, Rainer, Krüger, Véronique, Stricker, Winfried, Aigner, Manfred
• Format: Article
• Language: English
• Subjects: Laminar premixed; Laser diagnostics; Pressurized flames; Soot
• ISSN: 1540-7489; 1873-2704
• DOI: 10.1016/j.proci.2004.08.158

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 N 2 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.