VISUALIZATION OF OH RADICAL DISTRIBUTION IN A METHANE-HYDROGEN MIXTURE FLAME BY ISOTOPE SHIFT/PLANAR LASER INDUCED FLUORESCENCE SPECTROSCOPY

2006 ◽  
Vol 178 (12) ◽  
pp. 2061-2074 ◽  
Author(s):  
ATSUSHI KATOH ◽  
HIROYUKI OYAMA ◽  
KUNIYUKI KITAGAWA ◽  
ASHWANI K. GUPTA
Keyword(s):  
Fluorescence Spectroscopy ◽  
Isotope Shift ◽  
Laser Induced Fluorescence ◽  
Oh Radical ◽  
Hydrogen Mixture ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser ◽  
Radical Distribution

Analysis of flame structure by isotope shift-planar laser induced fluorescence spectrometry of trace OH and OD Radicals

2013 ◽  
Vol 106 ◽  
pp. 334-339 ◽  
Author(s):  
Tsuyoshi Kajimoto ◽  
Eisuke Yamada ◽  
Masahisa Shinoda ◽  
Nelfa Desmira ◽  
Kuniyuki Kitagawa ◽  
...  
Keyword(s):  
Isotope Shift ◽  
Flame Structure ◽  
Laser Induced Fluorescence ◽  
Fluorescence Spectrometry ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser

scholarly journals Spatially resolved measurement of hydroxyl (OH) radical concentration in a microwave plasma jet by planar laser-induced fluorescence

2014 ◽  
Vol 13 (1) ◽  
Author(s):  
Jan Voráč ◽  
Jaroslav Hnilica ◽  
Vít Kudrle ◽  
Pavel Dvořák
Keyword(s):  
Microwave Plasma ◽  
Plasma Jet ◽  
Laser Induced Fluorescence ◽  
Oh Radicals ◽  
Oh Radical ◽  
Maximal Concentration ◽  
Spatially Resolved ◽  
Radical Concentration ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser

AbstractThe spatially resolved concentration of OH radicals in the effluent of a microwave (MW) surfatron plasma jet was measured by planar laser-induced fluorescence. Two cases were compared – constant MW power and MW power modulated by 80 Hz. In both cases the maximal concentration was at the tip of the visible discharge, but for constant MW power the OH was spread over a larger volume. The maximum concentration in both cases was on the order of 10

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

2004 ◽  
Vol 128 (1) ◽  
pp. 8-12 ◽  
Author(s):  
Atsushi Katoh ◽  
Masahisa Shinoda ◽  
Kuniyuki Kitagawa ◽  
Ashwani K. Gupta
Keyword(s):  
Isotope Shift ◽  
Equivalence Ratio ◽  
Total Concentration ◽  
Combustion Process ◽  
Laser Induced Fluorescence ◽  
Oh Radicals ◽  
Percentage Increase ◽  
Dissociation Reaction ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser

Addition of steam to a flame has important implications in the combustion process. The dissociation of the added steam (e.g., H2O↔H+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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