Journal of Hydrogen and New Energy (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Study on Optimal Coefficients of Line Broadening Function for Performance Enhancements of CT-TDLAS

CT-레이저흡수분광법(TDLAS) 성능향상을 위한 레이저 선폭확장 함수 최적 계수 선정에 관한 연구

  • CHOI, DOOWON (Division of Mechanical Eng., Korea Maritime & Ocean Univ.) ;
  • CHO, GYONGRAE (Graduate School of Advanced Tech., & Science, Tokushima Univ.) ;
  • DEGUCHI, YOSHIHIRO (Graduate School of Advanced Tech., & Science, Tokushima Univ.) ;
  • BAEK, TAESIL (Dept. of Steel Industry, Pohang Univ.) ;
  • DOH, DEOGHEE (Division of Mechanical Eng., Korea Maritime & Ocean Univ.)
  • 최두원 (한국해양대학교 공과대학 기계공학부) ;
  • 조경래 ;
  • ;
  • 백태실 (포항대학교 제철산업과) ;
  • 도덕희 (한국해양대학교 공과대학 기계공학부)
  • Received : 2016.12.01
  • Accepted : 2016.12.30
  • Published : 2016.12.30
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Abstract

The performance of the CT-TDLAS (computed tomography-tunable diode laser absorption spectroscopy) is strongly dependent upon the line broadening functions. The line of the laser beam used in the TDLAS is scattered by the natural broadening, the collisional broadening and the doppler broadening. The influence of the natural broadening to the experimental spectra obtained in the TDLAS is negligible. The influences of the collisional broadening and the doppler broadening to the experimental spectra are relatively large, in high pressure gas flows and in high temperature low pressure gas flows, respectively. In this study, optimal coefficients are proposed for the doppler broadening function by using the experimental data obtained in a flat burner test. The optimal coefficients were ${\gamma}_j=0.16$ and n=0.37. Using these coefficients, the temperature and concentration distributions at the engine exhaust gas pipe have been calculated showing their validities.

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References

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