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SOOT PROCESSES IN A STRONGLY-RADIATING TURBULENT FLAME FROM LASER SCATTERING/EXTINCTION EXPERIMENTS

DOI: 10.1615/ICHMT.2004.RAD-4.410
10 pages

Bo Yang
Department of Mechanical and Aerospace Engineering University of Missouri - Rolla Rolla, MO 65409-0050, USA; Huazhong University of Science and Technology, 1037 Luoyu Rd., Wuhan 430074, China

Umit O. Koylu
Dep. of Chem. Eng., Yale University, New Haven, CT, 06520; Department of Mechanical and Aerospace Engineering University of Missouri - Rolla Rolla, MO 65409-0050, USA

Sinopsis

Soot formation within a highly-luminous turbulent non-premixed flame burning acetylene in air was investigated by conducting laser scattering and extinction experiments. Mean soot volume fractions, spherule diameters, and aggregate sizes were exclusively characterized based on an optical interpretation that can properly account for the actual particulate morphology. This allowed decoupling of surface growth and oxidation from the unavoidable aggregation process and therefore provided accurate descriptions of turbulent soot dynamics. The present experiments broadened the database in a lightly-sooting ethylene flame previously considered so that the effects of fuel type on particle evolution within turbulent flames could be explored. The relatively high particle concentrations in the acetylene flame also offered conditions that are encountered in many practical combustors operating at elevated pressures, e.g. diesel engines. The findings reported here are relevant not only to developing computational models for accurate predictions of radiative transfer but also to controlling pollutant emissions from combustion systems.

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