Joint PDFs of Scalar Quantities in Turbulent Diffusion Flames by Raman and Rayleigh Scattering

1993 ◽  
Vol 97 (12) ◽  
pp. 1713-1716 ◽  
Author(s):  
F. Hassel ◽  
A. Hundhausen ◽  
Th. Klos ◽  
U. Sprenzel ◽  
H. Bockhorn
Keyword(s):  
Turbulent Diffusion ◽  
Rayleigh Scattering ◽  
Diffusion Flames ◽  
Turbulent Diffusion Flames

Optical Properties of Overfire Soot in Buoyant Turbulent Diffusion Flames at Long Residence Times

1994 ◽  
Vol 116 (1) ◽  
pp. 152-159 ◽  
Author(s):  
U¨. O¨. Ko¨ylu¨ ◽  
G. M. Faeth
Keyword(s):  
Optical Properties ◽  
Residence Time ◽  
Cross Sections ◽  
Turbulent Diffusion ◽  
Rayleigh Scattering ◽  
Diffusion Flames ◽  
Model Performance ◽  
Turbulent Diffusion Flames ◽  
Angle Scattering ◽  
Time Regime

The optical properties of soot were studied for the fuel-lean (overfire) region of buoyant turbulent diffusion flames in still air. Results were limited to the long residence time regime where soot structure is independent of position in the overfire region and residence time for a particular fuel. Measurements included scattering, absorption, and extinction cross sections at 514.5 nm and extinction cross sections at 632.8 and 1152 nm for flames fueled with acetylene, propylene, ethylene, and propane. The measurements were used to evaluate scattering predictions based on the Rayleigh-Debye-Gans (RDG) approximation for randomly oriented poly disperse fractal aggregates of spherical primary soot particles having constant diameters. The present soot aggregates exhibited significant departures from Rayleigh-scattering behavior at 514.5 nm, with forward scattering roughly 100 times larger than wide-angle scattering and ratios of scattering to absorption cross sections in the range 0.22–0.41, increasing with increasing propensity of the fuel to soot. The approximate RDG theory generally provided an acceptable basis to treat the optical properties of the present overfire soot aggregates, although additional measurements in the Guinier (small angle) regime are needed for a definitive evaluation of model performance.

Soot formation in ducted turbulent diffusion flames

AIAA Journal ◽  
1991 ◽  
Vol 29 (6) ◽  
pp. 932-935 ◽  
Author(s):  
T. Neill ◽  
I. M. Kennedy
Keyword(s):  
Turbulent Diffusion ◽  
Diffusion Flames ◽  
Soot Formation ◽  
Turbulent Diffusion Flames

Density Variations Effects in Turbulent Diffusion Flames: Modeling Of Unresolved Fluxes

2014 ◽  
Vol 186 (10-11) ◽  
pp. 1370-1391 ◽  
Author(s):  
Sylvain Serra ◽  
Vincent Robin ◽  
Arnaud Mura ◽  
Michel Champion
Keyword(s):  
Turbulent Diffusion ◽  
Diffusion Flames ◽  
Turbulent Diffusion Flames

scholarly journals Soot modeling in turbulent diffusion flames: review and prospects

2021 ◽  
Vol 43 (4) ◽  
Author(s):  
Sebastian Valencia ◽  
Sebastián Ruiz ◽  
Javier Manrique ◽  
Cesar Celis ◽  
Luís Fernando Figueira da Silva
Keyword(s):  
Turbulent Diffusion ◽  
Diffusion Flames ◽  
Turbulent Diffusion Flames
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