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Soot Kinetics/Radiation Interactions in Methane/Air Diffusion Flames.


pdf icon Soot Kinetics/Radiation Interactions in Methane/Air Diffusion Flames. (172 K)
Sivathanu, Y. R.; Gore, J. P.

NISTIR 5499; September 1994.

National Institute of Standards and Technology. Annual Conference on Fire Research: Book of Abstracts. October 17-20, 1994, Gaithersburg, MD, 125-126 pp, 1994.

Sponsor:

National Institute of Standards and Technology, Gaithersburg, MD

Available from:

National Technical Information Service
Order number: PB95-104964

Keywords:

fire research; diffusion flames; soot; kinetics; methane; radiative heat transfer

Abstract:

Radiation heat transfer from flames depends on the instantaneous soot volume fractions and temperatures. The major obstacle to obtaining accurate soot volume fraction predictions in flames is the strong coupling between the finite rate kinetics of soot processes and radiation. Detailed models of soot kinetics cannot be incorporated in turbulent flame studies due to the limitations of computer resources. Therefore, many studies have concentrated on simplified global kinetics models incorporating soot nucleation, growth and oxidation mechanisms. The local temperatures needed for the soot kinetics calculations were obtained using simplified global radiation models. However, in strongly radiating flames it has been shown that the radiation and soot kinetics calculations need to be coupled to accurately predict observed soot volume fractions. The degree of this coupling in weakly radiating flames, where radiation is predominantly from gas species molecules rather than soot, has not been studied. The objective of the present work is evaluate this coupling of radiation and soot kinetics in weakly radiating flames by using the simplified soot kinetics model of Ref. 4 along with a narrow-band radiation model.