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TECHNICAL PAPERS: Fuels & Combustion Technology

Visualization of Steam Addition Effect on OH Distribution in a Flame by Isotope Shift/Planar Laser-Induced Fluorescence (IS/PLIF) Spectroscopy

[+] Author and Article Information
Atsushi Katoh, Masahisa Shinoda, Kuniyuki Kitagawa

Research Center for Advanced Energy Conversion, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

Ashwani K. Gupta1

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742akgupta@eng.umd.edu

1

To whom correspondence should be addressed.

J. Eng. Gas Turbines Power 128(1), 8-12 (Oct 07, 2004) (5 pages) doi:10.1115/1.2056528 History: Received January 23, 2004; Revised October 07, 2004

Addition of steam to a flame has important implications in the combustion process. The dissociation of the added steam (e.g., H2OH+OH, etc.) is one of the effects that contribute to the production of radical species, such as OH, H, and O, in the flame. In order to distinctly visualize two types of OH radicals produced from the fuel-air combustion reaction and that from the dissociation reaction with the added steam, we have developed a new method for planar laser-induced fluorescence spectroscopy in combination with isotope shift (herein called IS/PLIF spectroscopy). This technique has been applied to examine a methane-oxygen-nitrogen premixed flame. Two-dimensional fluorescence intensity distributions of OH radicals in the flames were monitored under three different conditions. They include without steam addition, with H2O steam addition, and with D2O steam addition. From the experimental data obtained under the three conditions, the distinction between the two types of OH radicals could be obtained. The results showed that steam addition reduced the total concentration of OH produced from the combustion and dissociation reactions and that the dissociation reaction of the added steam contributed to the production of OH. Furthermore, the results indicated that the percentage decrease in OH from fuel-air combustion reactions due to the temperature decrease effect with steam addition was almost independent of the equivalence ratio during combustion. In contrast, the percentage increase in OH produced from dissociation reaction with the steam depended on the equivalence ratio.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Conceptual diagram of IS/PLIF spectroscopy

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Figure 2

Schematic diagram of experimental apparatus

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Figure 3

2D distribution of flame temperature at ϕ=0.9

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Figure 4

2D distribution of flame temperature at ϕ=1.0

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Figure 5

2D distribution of flame temperature at ϕ=1.2

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Figure 6

2D distribution of OH fluorescence intensity at ϕ=0.9

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Figure 7

2D distribution of OH fluorescence intensity at ϕ=1.0

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Figure 8

2D distribution of OH fluorescence intensity at ϕ=1.2

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