Measurements of Soot Volume Fraction in Pulsed Diffusion Flames by Laser-Induced Incandescence

Department of Ocean and Mechanical Engineering, Florida Atlantic University, Boca Raton, Florida, United States
Experiments in Fluids (Impact Factor: 1.67). 01/2008; 44(1):137-144. DOI: 10.1007/s00348-007-0382-3


Laser induced incandescence (LII) is used in this study to measure soot volume fractions in steady and pulsed laminar diffusion
flame. The main objective of this study is to investigate the effect of flame pulsing on soot formation inside the flame region.
Phase-locked soot images were obtained for flame pulsing frequency between 10 and 200Hz. The phase-locked soot images revealed
the entire motion process of the soot field during one pulsation period. The results showed that the total soot volume fraction
in the flame region increased by 45% when the pulsing frequency was increased from 10 to 200Hz.

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Available from: Chaouki Ghenai, May 07, 2015
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    ABSTRACT: This paper presents the 3-D (three-dimensional) reconstruction of soot volume fraction distribution of a sooting flame based on tomographic imaging and image processing techniques. Eight flexible imaging fiber bundles and two RGB (Red, Green and Blue) CCD (Charge-coupled Device) cameras are used to obtain the 2-D (two-dimensional) eight asymmetric flame image projections concurrently from eight different locations around the burner. Tomographic algorithm LFBP-SART is utilized to reconstruct the soot volume fraction distributions on both cross- and longitudinal-sections of the flames. A series of experiments were carried out on a gas-fired combustion rig for the determination of soot volume fraction using the computing algorithm proposed. Results obtained demonstrate that the tomographic algorithm and numerical approach are effective for reconstructing the 3-D soot volume fraction distribution of a laminar diffusion flame.
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