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TECHNICAL PAPERS: Fuels & Combustion Technology

Experimental Analysis of Soot Formation in Sooting Diffusion Flame by Using Laser-Induced Emissions

[+] Author and Article Information
Kazuhiro Hayashida

Department of Mechanical Engineering,  Kisarazu National College of Technology, 2-11-1 Kiyomidai-Higashi, Kisarazu, Chiba 292-0041, Japanhayasida@m.kisarazu.ac.jp

Kenji Amagai

Department of Mechanical System Engineering,  Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japanamagai@me.gunma-u.ac.jp

Keiji Satoh

Department of Mechanical System Engineering,  Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japand04b207@gs.eng.gunma-u.ac.jp

Masataka Arai

Department of Mechanical System Engineering,  Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japanarai@me.gunma-u.ac.jp

J. Eng. Gas Turbines Power 128(2), 241-246 (Feb 09, 2005) (6 pages) doi:10.1115/1.2056536 History: Received April 12, 2004; Revised February 09, 2005

Two-dimensional images of OH fluorescence, polycyclic aromatic hydrocarbons (PAHs) fluorescence, and laser-induced incandescence (LII) from soot were measured in a sooting diffusion flame. To obtain an accurate OH fluorescence image, two images were taken with the laser wavelength tuned to (“on”) and away from (“off”) the OH absorption line. An accurate OH fluorescence image was obtained by subtracting the off-resonance image from the on-resonance image. For the PAH fluorescence and LII measurements, temporally resolved measurements were used to obtain the individual images; the LII image was obtained by detecting the LII signal after the PAH fluorescence radiation had stopped and the PAH fluorescence image was obtained by subtracting the LII image from the simultaneous image of PAH fluorescence and LII. Based on the obtained images, the relative location of OH, PAH, and soot in the flame was discussed in detail. To investigate the PAH size distribution in a sooting flame using LIF, an estimation strategy for PAH size is proposed. Emission spectra were measured at several heights in the flame using a spectrograph. Since the emission wavelength of PAH fluorescence shifts toward longer wavelengths with increasing PAH size, the main PAH components in the emission spectra could be estimated. The results suggest that PAH grows and the type of PAH changes as the soot inception region was approached. Near the soot inception region, we estimated that the PAHs, which have over 16 carbon atoms, mainly constituted the emission spectrum.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental apparatus

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Figure 2

Simultaneous image of PAH-LIF and LII

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Figure 3

Temporal variations of signal intensity (Rayleigh scattering, PAH fluorescence, and LII)

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Figure 4

Two-dimensional images of OH fluorescence, PAH fluorescence, and LII

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Figure 5

Axial distributions of temperature, OH fluorescence, PAH fluorescence, and LII

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Figure 6

Radial distributions of OH fluorescence, PAH fluorescence, and LII

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Figure 7

Relation between peak fluorescence wavelength and PAH size

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Figure 8

Emission spectra from propane diffusion flame

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Figure 9

Estimation of PAH size in propane diffusion flame

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