Planar measurements of OH and $\small{O_{2}}$ number density in premixed $\small{C_{3}}$H$\small{_{8}}$O$\small{_{2}}$ flame using laser induced pre-dissociative fluorescence

Title & Authors
Planar measurements of OH and $\small{O_{2}}$ number density in premixed $\small{C_{3}}$H$\small{_{8}}$O$\small{_{2}}$ flame using laser induced pre-dissociative fluorescence
Jin, Seong-Ho; Nam, Gi-Jung; Kim, Hei-San; Jang, Rae-Gak; Park, Seung-Han; Kim, Ung; Park, Gyeong-Seok; Sim, Gyeong-Hun; Kim, Gyeong-Su;

Abstract
Planar images of OH and $\small{O_{2}}$ with tunable KrF excimer laser which has a) 0.5 $\small{cm^{-1}}$ / linewidth, b) 0.5 nm tuning range, c) 150 mJ pulse energy, and d) 20 ns pulse width are obtained to determine spatial distributions of OH and $\small{O_{2}}$ in premixed $\small{C_{3}}$H$\small{_{8}}$ /O$\small{_{2}}$ flame. The technique is based on planar laser induced pre-dissociative fluorescence(PLIPF) in which collisional quenching is almost avoided because of the fast pre-dissociation. Dispersed LIPF spectra of OH and $\small{O_{2}}$ are also measured in a flame in order to confirm the excitation of single vibronic state of OH and $\small{O_{2}}$, OH and $\small{O_{2}}$ are excited on the P$\small{_{2}}$(8) line of the $\small{A^{2}}$.SIGMA.$\small{^{+}}$(v'= 3)-X$\small{^{2}}$.PI.(v'||'||'&'||'||'quot;= 0) band and R(17) line of the Schumann-Runge band B$\small{^{3}}$.SIGMA.$\small{_{u}}$ $\small{^{[-10]}}$ (v'= 0)- X$\small{^{3}}$.SIGMA.$\small{_{g}}$ $\small{^{[-10]}}$ (v'||'||'&'||'||'quot;= 6), respectively. Dispersed OH and $\small{O_{2}}$ spectra show an excellent agreement with simulated spectrum and previous works done by other group respectively. It is confirmed that OH widely distributed around flame front area than $\small{O_{2}}$.
Keywords
LIF;LIPF;Collisional Quenching;KrF Excimer Laser;
Language
Korean
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