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Optical Properties of Soot in the Overfire Region of Large Buoyant Turbulent Diffusion Flames.


pdf icon Optical Properties of Soot in the Overfire Region of Large Buoyant Turbulent Diffusion Flames. (280 K)
Krishnan, S. S.; Lin, K. C.; Faeth, G. M.

NISTIR 6242; October 1998.

National Institute of Standards and Technology. Annual Conference on Fire Research: Book of Abstracts. November 2-5, 1998, Gaithersburg, MD, Beall, K. A., Editor(s), 29-30 pp, 1998.

Available from:

National Technical Information Service
Order number: PB99-102519

Keywords:

fire research; fire science; fire suppression; soot; turbulent flames; diffusion flames; optical properties

Abstract:

Information about the optical properties of soot is needed in order to develop optical measurements of soot properties and to compute soot radiation in flame environments. Unfortunately, current estimates of soot optical properties involve excessive uncertainties due to uncertainties about soot refractive indices. Wu et al sought to correct this deficiency by measuring the refractive index properties of soot in the overfire region of large gaseous hydrocarbon fueled buoyant turbulent diffusion flames burning in still air where soot properties depend on the fuel but are independent of position and flame residence time by exploiting the properties of Rayleigh-Debye-Gans scattering theory for polydisperse fractal aggregates (denoted RDG-PFA theory) which has been recently shown to be effective for soot optical properties. Thus, the present study sought to resolve this issue by completing similar measurements of soot optical properties, again considering soot in the overfire region of large buoyant turbulent flames but for a broader range of both gas and liquid hydrocarbon fuels burning in still air.