Proposal of quantitative measurement of OH radical using planar laser induced fluorescence calibrated by cavity ring-down spectroscopy in turbulent premixed flames

2017 ◽  
Author(s):  
Shuang Chen ◽  
Xiaobo Tu ◽  
Tie Su ◽  
Jinhe Mu ◽  
Furong Yang
Keyword(s):  
Quantitative Measurement ◽  
Premixed Flames ◽  
Laser Induced Fluorescence ◽  
Oh Radical ◽  
Turbulent Premixed Flames ◽  
Cavity Ring Down Spectroscopy ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser ◽  
Cavity Ring Down ◽  
Turbulent Premixed

Investigation of nitrogen-diluted syngas non-premixed flames measured by planar laser-induced fluorescence of hydroxyl and particle image velocimetry

2011 ◽  
Vol 225 (7) ◽  
pp. 1672-1680
Author(s):  
P Guo ◽  
S Zang ◽  
B Ge ◽  
Y Tian
Keyword(s):  
Carbon Monoxide ◽  
Particle Image Velocimetry ◽  
Particle Image ◽  
Premixed Flames ◽  
Laser Induced Fluorescence ◽  
Experimental Results ◽  
Planar Laser Induced Fluorescence ◽  
Image Velocimetry ◽  
Planar Laser ◽  
Recirculation Zones

In order to investigate the effects of nitrogen dilution on combustion behaviour of syngas flames, a model combustor with optical access for swirl non-premixed flames was developed. Experimental results from planar laser-induced fluorescence (PLIF) of OH and particle image velocimetry (PIV) are presented. The syngas consists of hydrogen and carbon monoxide of volume fraction ratio kept at 0.78. Up to 60 per cent (by volume) of nitrogen was added into syngas, as well as reference fuels including methane, hydrogen, and carbon monoxide, for dilution. Flow fields obtained by PIV reveal that the averaged typical swirling flow structure is not influenced by dilution content, which has more effect on turbulence intensities in recirculation zones and shear layers. Additionally, analysis of reaction zones and regions of burnt gas from OH-PLIF measurement shows that although syngas flame burns closer to fuel spray exit than methane, the latter shows more combustion stability, probably because of the different stabilization mechanisms for these two flames. With less support from hot burned gases in recirculation zones, the content of hydrogen plays a crucial role in syngas flame stabilization. Experimental results also imply that the increase of dilution content in fuel leads to less flame opening angle and thinner flame base.

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

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