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Aggregate formation in sooting counterflow diffusion flames

Leusden, C. P. and Hasse, C. and Peters, N. (2002):
Aggregate formation in sooting counterflow diffusion flames.
In: Proceedings of the Combustion Institute, pp. 2383-2389, 29, (2), [Article]

Abstract

Soot formation is investigated experimentally and numerically in a counterflow diffusion flame which is formed by an acetylene/nitrogen mixture on the fuel side and hot postflame gases of a lean premixed flame on the oxidizer side. The modeling approach uses a detailed chemical mechanism with 453 reactions and 82 species. The soot model is based on the statistical moment approach. It was extended to account for the formation of aggregates, which are clusters of primary particles. Experimental results for temperature-and soot-related quantities are compared to simulations with a special emphasis on the effect of soot aggregation. Aggregate formation is shown to be important for predicting soot particle sizes and optical properties, but it does not significantly influence soot-generating processes and the overall flame structure. We also show that thermal diffusive processes must be considered for the gas-phase modeling, especially for the species (Soret effect) as it has an impact on the pyrolysis zone of the diffusion flame and consequently on the soot concentration.

Item Type: Article
Erschienen: 2002
Creators: Leusden, C. P. and Hasse, C. and Peters, N.
Title: Aggregate formation in sooting counterflow diffusion flames
Language: English
Abstract:

Soot formation is investigated experimentally and numerically in a counterflow diffusion flame which is formed by an acetylene/nitrogen mixture on the fuel side and hot postflame gases of a lean premixed flame on the oxidizer side. The modeling approach uses a detailed chemical mechanism with 453 reactions and 82 species. The soot model is based on the statistical moment approach. It was extended to account for the formation of aggregates, which are clusters of primary particles. Experimental results for temperature-and soot-related quantities are compared to simulations with a special emphasis on the effect of soot aggregation. Aggregate formation is shown to be important for predicting soot particle sizes and optical properties, but it does not significantly influence soot-generating processes and the overall flame structure. We also show that thermal diffusive processes must be considered for the gas-phase modeling, especially for the species (Soret effect) as it has an impact on the pyrolysis zone of the diffusion flame and consequently on the soot concentration.

Journal or Publication Title: Proceedings of the Combustion Institute
Volume: 29
Number: 2
Uncontrolled Keywords: Acetylene; Oxidation; Particle size analysis; Thermal diffusion, Counterflow diffusion flames, Soot
Divisions: 16 Department of Mechanical Engineering > Simulation of reactive Thermo-Fluid Systems (STFS)
16 Department of Mechanical Engineering
Date Deposited: 29 Nov 2017 14:57
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