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Article

Measurement of Temperature and H2O Concentration in Premixed CH4/Air Flame Using Two Partially Overlapped H2O Absorption Signals in the Near Infrared Region

1
Industrial Environment Green Deal Agency, Korea Institute of Industrial Technology, Cheonan 31056, Korea
2
Department of Mechanical Engineering, Yonsei University, Seoul 03722, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Steven Wagner
Appl. Sci. 2021, 11(8), 3701; https://doi.org/10.3390/app11083701
Received: 28 March 2021 / Revised: 16 April 2021 / Accepted: 19 April 2021 / Published: 20 April 2021
It is important to monitor the temperature and H2O concentration in a large combustion environment in order to improve combustion (and thermal) efficiency and reduce harmful combustion emissions. However, it is difficult to simultaneously measure both internal temperature and gas concentration in a large combustion system because of the harsh environment with rapid flow. In regard, tunable diode laser absorption spectroscopy, which has the advantages of non-intrusive, high-speed response, and in situ measurement, is highly attractive for measuring the concentration of a specific gas species in the combustion environment. In this study, two partially overlapped H2O absorption signals were used in the tunable diode laser absorption spectroscopy (TDLAS) to measure the temperature and H2O concentration in a premixed CH4/air flame due to the wide selection of wavelengths with high temperature sensitivity and advantages where high frequency modulation can be applied. The wavelength regions of the two partially overlapped H2O absorptions were 1.3492 and 1.34927 μm. The measured signals separated the multi-peak Voigt fitting. As a result, the temperature measured by TDLAS based on multi-peak Voigt fitting in the premixed CH4/air flame was the highest at 1385.80 K for an equivalence ratio of 1.00. It also showed a similarity to those tendencies to the temperature measured by the corrected R-type T/C. In addition, the H2O concentrations measured by TDLAS based on the total integrated absorbance area for various equivalent ratios were consistent with those calculated by the chemical equilibrium simulation. Additionally, the H2O concentration measured at an equivalence ratio of 1.15 was the highest at 18.92%. View Full-Text
Keywords: tunable diode laser absorption spectroscopy; temperature; concentration; partially overlapped absorption; premixed flame tunable diode laser absorption spectroscopy; temperature; concentration; partially overlapped absorption; premixed flame
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MDPI and ACS Style

So, S.; Jeong, N.; Song, A.; Hwang, J.; Kim, D.; Lee, C. Measurement of Temperature and H2O Concentration in Premixed CH4/Air Flame Using Two Partially Overlapped H2O Absorption Signals in the Near Infrared Region. Appl. Sci. 2021, 11, 3701. https://doi.org/10.3390/app11083701

AMA Style

So S, Jeong N, Song A, Hwang J, Kim D, Lee C. Measurement of Temperature and H2O Concentration in Premixed CH4/Air Flame Using Two Partially Overlapped H2O Absorption Signals in the Near Infrared Region. Applied Sciences. 2021; 11(8):3701. https://doi.org/10.3390/app11083701

Chicago/Turabian Style

So, Sunghyun, Nakwon Jeong, Aran Song, Jungho Hwang, Daehae Kim, and Changyeop Lee. 2021. "Measurement of Temperature and H2O Concentration in Premixed CH4/Air Flame Using Two Partially Overlapped H2O Absorption Signals in the Near Infrared Region" Applied Sciences 11, no. 8: 3701. https://doi.org/10.3390/app11083701

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