• Title/Summary/Keyword: 라만 산란법

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Equivalence Ratio Measurements in Gas Spray Using Laser Raman Scattering (Laser Raman Scattering을 이용한 가스 분무내 당량비 계측에 관한 연구)

  • Jin, S.H.;Park, K.S.;Song, J.I.;Kim, G.S.
    • Journal of ILASS-Korea
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    • v.2 no.4
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    • pp.7-14
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    • 1997
  • Laser Raman scattering method has been applied to measure equivalence ratio of methane/air mixture in injected spray. We used high power KrF excimer laser$(\lambda=248nm)$ and a high gain ICCD camera to capture low intensity signal. Raman shifts and Raman scattering cross -sections of $H_2,\;O_2,\;N_2,\;CO_2,\;CH_4\;and\;C_3H_8$ are measured precisely. Our results show an excellent agreement with those of other groups. Mole fraction measurement of $O_2\;and\;N_2$ from air shows that $O_2:N_2=0.206:0.794$. We used gas injector which was operated at 1 bar. Methane is used as a fuel. Spray region is $10mm\times37mm$ and this region is divided into 80 points. In Raman signals are obtained and ensemble averaged for each point. 3-d and contour plot of distribution of equuivalence ratio is presented. Our measured results show that the equivalence ratio of methane/air mixture in methane-rich region is reasonable. However, more study is necessary for methane-lean region because background noise level is almost same as Raman intensity of methane.

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The study on the combustion characteristics of a planar flame burner as a calibration source of laser diagnostics (연소진단 검정원으로써 평면화염 버너의 연소특성 연구)

  • Gil,Yong-Seok;Jeong, Seok-Ho;Lee, Byeong-Jun;Han, Jae-Won
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.20 no.10
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    • pp.3355-3360
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    • 1996
  • To provide standard data of temperature and species concentration in a flame for calibrating the laser based combustion diagnostics, we investigated combustion characteristics of a flat flame burner(Mckennar Product). For various stoichiometric ratios we measured temperature and concentration of OH in the premixed methane/air flame with Coherent anti-Stokes Raman spectroscopy and laser induced fluorescence technique, respectively. Assuming the chemical equilibrium condition at the measured temperature, the mole fraction of the OH radical in the flame was obtained and compared with numerical analysis.