Mixing and Radiation Properties of Buoyant Luminous Flame Environments.
Mixing and Radiation Properties of Buoyant Luminous
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,
Available from: National Technical Information Service
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buoyant plumes; diffusion flames; fire research; optical
properties; soot; soot aggregates; turbulent flames;
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.