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Research Article

An Experimental Study on Measurement of OH Radical Concentration in Flame by Laser Absorption Spectroscopy of Near-Infrared Region

근적외선 파장 영역에서 레이저 흡수 분광법을 이용한 화염 내 OH 라디칼 농도 측정에 관한 실험적 연구

Sunghyun So12
Miyeon Yoo13
Jiyeon Park14
Daehae Kim1
Dae Geun Park1
Jungho Hwang2
Changyeop Lee1*
소 성현12
유 미연13
박 지연14
김 대해1
박 대근1
황 정호2
이 창엽1*
1Thermochemical Energy System R&BD Group, Korea Institute of Industrial Technology (KITECH)
2Department of Mechanical Engineering, Yonsei University
3Department of Physics, Chungbuk National University
4Department of Mechanical Engineering, Sungkyunkwan University
1한국생산기술연구원 고온에너지시스템그룹
2연세대학교 기계공학과
3충북대학교 물리학과
4성균관대학교 기계공학과
* Corresponding Author
March 2020. pp. 27-36
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Abstract

As primary carrier of chain branching and propagation reactions, OH (Hydroxyl) radical is one of the most important species in hydrocarbon combustion environment. However, it is no easy to measure the OH radicals concentration in the flame, because it has short duration time, big fluctuation and rapid reaction characteristics. Nevertheless, it is important to measure OH radicals precisely because OH radicals in fames are closely related to combustion efficiency and pollutant emission. To overcome the OH radical concentration measurement in the rapid chemical reaction, TDLAS (Tunable Diode Laser Absorption Spectroscopy) can be a very attractive analysis technique for measuring the concentration of certain species in a gaseous mixture in the flame. In this study, an optical absorption region of OH radical was selected in the near infrared laser (6419 cm-1) to measure OH radical quantitatively in flame. Unfortunately, Most of the light absorption signals of OH radical are interfered by the absorption signals of H2O. So, the OH radical concentration should be calculated after excluding the contribution of H2O absorption from united absorption signal of OH and H2O.

Keywords
TDLAS
Hydroxyl
Absorption
Flame
Near-Infrared
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Information
  • Publisher :The Korean Society Combustion
  • Publisher(Ko) :한국연소학회
  • Journal Title :Journal of The Korean Society Combustion
  • Journal Title(Ko) :한국연소학회지
  • Volume : 25
  • No :1
  • Pages :27-36
  • Received Date :2019. 10. 01
  • Revised Date :2019. 11. 11
  • Accepted Date : 2019. 12. 04
  • DOI :https://doi.org/10.15231/jksc.2020.25.1.027
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