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Mixing and Radiation Properties of Buoyant Luminous Flame Environments.


pdf icon Mixing and Radiation Properties of Buoyant Luminous Flame Environments. (6112 K)
Dai, Z.; Krishnan, S. K.; Lin, K. C.; Sangras, R.; Wu, J. S.; Faeth, G. M.

NIST GCR 97-721; 72 p. August 1997.

Sponsor:

National Institute of Standards and Technology, Gaithersburg, MD

Available from:

National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161.
Telephone: 1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900; Rush Service (Telephone Orders Only) 800-553-6847;
Website: http://www.ntis.gov
Order number: PB97-196851

Keywords:

buoyant plumes; diffusion flames; fire research; optical properties; soot; soot aggregates; turbulent flames; turbulent mixing

Abstract:

An investigation of the radiation and mixing properties of buoyant turbulent diffusion flames is described. The study was divided into two phases: (1) the consideration of the optical and radiative properties of soot, which must be understood in order to develop nonintrusive methods for measuring soot properties and to estimate the continuum radiation properties of soot in flame environments, and (2) the consideration of the structure and mixing properties of buoyant turbulent plumes, which must be understood in order to resolve effects of turbulent/radiation interactions and benchmark computationally tractable models of buoyant turbulent flows. Consideration of the optical and radiative properties of soot involved evaluation of the Rayleigh-Debye-Gans (RDG) scattering approximation for soot aggregates and the use of this theory to measure the refractive index properties and dimensionless extinction coefficients in the visible (350-800 nm) of soot emitted from buoyant turbulent diffusion flames in the long residence time regime where emitted soot properties are independent of position in the flame and flame residence time.