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

레이저 유도 선해리 형광법과 래일레이 산란법에 의한 층류 비예혼합 수소/질소 화염의 온도 및 라디칼 특성에 관한 연구

  • Published : 2002.09.15

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 $A^2{\Sigma}^{+}({\nu}^{'}=3)-X^{2}{\Pi}({\nu}^{''}=o)$ band and R(17) line of the Schumann-Runge band $B^{3}{\Sigma}_{u}{^-}(\nu^{'}=0)-X^{3}{\Sigma}_{g}{^-}({\nu}^{''}=6)$, 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

References

  1. D. Stepowski and G. Cabot : "Single-Shot Temperature and Mixture Fraction Profiles by Rayleigh Scattering in the Development Zone of a Turbulent Diffusion Flame", Combust. Flame 88, 1991, pp. 296-308 https://doi.org/10.1016/0010-2180(92)90036-O
  2. R. W. Dibble and R. E. Hollenbach : "Laser Rayleigh Thermometry in Turbulent Flames", Eighteenth Symposium (International) on Combustion, The Combustion Institute, Pittsburg, 1981, p. 1489-1499
  3. F. -Q. Zhao, T. Takemoto, and K. Nishida : "Two-Dimensional Measurements of the Fuel Vapor Concentration in the Combustion Chamber of a SI Engine with Laser Rayleigh Scattering", SAE Paper, No.922389, 1992
  4. R. E. Setchell : "Initial Measurements within an Internal Combustion Engine Using Raman Spectroscopy", Sandia National Laboratories Report, SAND 78-1220, 1978
  5. S. C. Johnston : "Precombustion Fuel/Air Distribution in a Stratified Charge Engine Using Laser Raman Spectroscopy", SAE Paper, No.790433, 1979
  6. P. R. Crosley : "Semiquantitative LaserInduced fluorescence in Flames", Combust. Flame 78, 1989, pp. 153-167 https://doi.org/10.1016/0010-2180(89)90013-8
  7. T. A. Baritaud and T. A. Heinze :"Gasoline Distribution Measurements with PLIF in a Sl Engine", SAE Paper, No.922355, 1992
  8. H. Neij and M. Alden : "Application of Two-Photon Laser-Induced Fluorescence for Visualization of Water Vapor in Combustion Environments", Appl. Opt., Vol. 33, No. 27, 1994, pp. 6514-6523 https://doi.org/10.1364/AO.33.006514
  9. M. Lebel and M. J. Cottereau : "Study of the Effect of Residual Gas Fraction on Combustion in a S.I. Engine Using Simultaneous CARS Measurements of Temperature and $CO_2$ Concentration", SAE Paper, No.922388, 1992
  10. P. Andiesen, A. Bath, W. Groger, H. W Lulf, G. Meijer, and J. J. Meuler : "Laser Induced fluorescence with Tunable Excimer Lasers as a Possible Method for Instantaneous Temperature Filed Measurements at High Pressures: Checks with an Atmospheric Flarne", Appl. Opt, Vol. 27, No. 2, 1988, pp. 365-378 https://doi.org/10.1364/AO.27.000365
  11. T. Nakada : "Unburnt Gas Temperature Measurements Using Single Shot CARS in a Spark Ignition Engine", International Symposium COMODIA 90, 1990, pp.393-398
  12. M. Engelhard, W. Jacob, and W. Moller :"New Calibration Method for the Determination of the Absolute Density of CH Radicals through Laser Induced Fluorescence", Appl. Opt., Vol. 34, No. 21, 1995, pp. 4542-4551 https://doi.org/10.1364/AO.34.004542
  13. 김후중, 김용모, 안국영 : "수소 확산 화염의 구조에 미치는 Lewis 수의 영향", 대한 기계학회논문집(B), Vol. 21, No. 9, 1997, pp. 1126-1138
  14. A. C. Ecbreth : "Laser Diagnostics for Combustion Temperature and Species", Abacus-press, UK, 1996, pp. 268-272
  15. J. R. Smith : "Temperature and Density Measurements in an Engine by Pulsed Raman Spectroscopy", SAE Paper, No.0.800137, 1980
  16. P. Miles and M. Dilligan : "Quantitative In-Cylinder Fluid Composition Measurements Using Broadband Spontaneous Raman Scattering", SAE Paper, No.960828, 1996
  17. M. Komiyama, T. Kema, and T. Takagi :"Measurements of OH Concentration and Temeprature in DifFusion Flame by Excimer Laser-induced fluorescence and Rayleigh scattering", Trans. of JSME, Vol. 56, No. 523, 1990, pp. 810-816
  18. A. Koch and P. Andresen : "Planar Imaging of a laboratory Flame and Internal Combustion in on Automobile Engine using UV Rayleigh and Fluorescence Light", Appl. Phys., B56, 1993, pp. 177-184
  19. R. K. Hanson, J. M. Seitzman, and P. H.Paul : "Planar Laser-Fluorescence Imaging of Combustion Gases", Appl. Phys., B50, 1990, pp. 441-454