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A Study on Characteristics of Temperature and Radicals in Laminar Non-premixed H2/N2 Flame Using LIPF and LRS  

Jin, Seong Ho (School of Mechanical and Aerospace Engineering, College of Engineering, Seoul National University)
Park, Kyoung Suk (School of Mechanical & Nuclear Engineering, Kyunghee University)
Kim, Gun Hong (Cleaner Production Technology Center, Korea Institute of Industrial Technology)
Kim, Gyung Soo (Cleaner Production Technology Center, Korea Institute of Industrial Technology)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.13, no.3, 2002 , pp. 169-180 More about this Journal
Abstract
Rayleigh scattering and laser induced predissociative fluorescence are used to obtain two-dimensional images of temperature and species concentration in a laminar non-premixed flame of a diluted hydrogen jet. Rayleigh scattering cross-sections are experimentally obtained at 248nm. Planar images of OH and $O_2$ with tunable KrF excimer laser which has a) $0.5cm^{-1}$ linewidth, b) 0.5nm tuning range, c) 150mJ pulse energy, and d) 20ns pulse width are obtained to determine spatial distributions of OH and $O_2$. The technique is based on planar laser induced predissociative fluorescence (PLIPF) in which collisional quenching is almost avoided because of the fast predissociation. Dispersed LIPF spectra of OH and $O_2$ are also measured in a flame in order to confirm the excitation of single vibronic state of OH and $O_2$. OH and $O_2$ are excited on the $P_2$(8) and $Q_1$(11) line of the $A^2{\Sigma}^{+}({\nu}^{ band and R(17) line of the Schumann-Runge band $B^{3}{\Sigma}_{u}{^-}(\nu^{, respectively. Fluorescence spectra of OH and Hot $O_2$ are captured and two-dimensional images of the hydrogen flame field are successfully visualized.
Keywords
Rayleigh scattering; Laser induced predissociative fluorescence; Laminar non-premixed flame; Excimer laser;
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