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Optical temperature measurement method of premixed flames using a multi-laser system

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Abstract

The temperature distribution of a methane-air premixed flame was measured by the optical measurement technique. The absorption line was decomposed through 3rd order polynomial analysis, and the simultaneous multiplicative algebraic reconstruction technique (SMART) algorithm was adopted for computed tomography-tunable diode laser absorption spectroscopy (CT-TDLAS) data reconstruction. Methane-air premixed combustion system was used to construct laminar and turbulent flames. A double tube structure was adopted to solve combustion instability factors that occur when turbulent flames are generated. To overcome the high-temperature measurement limitations of a single laser system, two types of distributed feedback (DFB) lasers were mixed and measured. The relative error in temperature was largely confirmed at the central location of the burner. It was about 1.22 % for the laminar flame and 14.47 % for the turbulent flame.

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Abbreviations

I t :

Transmitted intensity

I in :

Incident intensity

A λ :

Absorbance

λ :

Selected wavelength

P :

Pressure

n i :

The number of density

L :

Optical path length

i:

Number of grid

j:

Column direction

S i,j :

The line strength of the absorption line j

G vi,j :

The line broadening function (Voigt profile)

α i,j :

Absorption coefficient

k :

Iteration number

T CT-TDLAS, Max :

The maximum temperature by CT-TDLAS measurement (K)

T CT-TDLAS, Min :

The minimum temperature by CT-TDLAS measurement (K)

T Thermocouple, Min :

The minimum temperature by Thermocouple measurement (K)

T :

Absolute temperature (K)

l/min :

Liter per minute

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Acknowledgments

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2020R1I1 A1A01052771). Further, this work was supported by the Technology Innovation Program (No. 20005750, Commercial Development of Combustion System Control Technology for Minimizing Pollutant with Multiple Analysis) funded by the Ministry of Trade, Industry & Energy (MOTIE, Republic of Korea).

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Correspondence to Min-Gyu Jeon.

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Min-Gyu Jeon earned his B.S. and M.S. in Refrigeration, Air-conditioning Eng. at Korea Maritime & Ocean Univ. (KMOU) in 2012 and 2014, respectively. He received his Ph.D. in Mechanical Engineering at Tokushima Univ., Japan, in 2018. He is currently a Research Professor in Mechanical Engineering at KMOU. His research interests include the areas of fundamentals of combustion, and flow visualizations in industry and marine and off-shore machinery.

Deog-Hee Doh earned his B.S. and M.S. in Marine Engineering at Korea Maritime & Ocean Univ. (KMOU) in 1985 and 1988, respectively. He received his Ph.D. in Mechanical Engineering at Tokyo University, Japan, in 1995. He is currently the President at KMOU. His main interests are in the areas of flow visualizations in industry and marine and offshore machinery.

Yoshihiro Deguchi earned his B.S., M.S., and Ph.D. in Engineering. at Toyohashi University of Technology in 1985, 1987, and 1990. He is currently a Professor at Tokushima University. His main interests are industrial applications of laser diagnostics such as tunable diode laser absorption spectroscopy (TDLAS) and laser-induced breakdown spectroscopy (LIBS).

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Jeon, MG., Doh, DH. & Deguchi, Y. Optical temperature measurement method of premixed flames using a multi-laser system. J Mech Sci Technol 35, 2535–2542 (2021). https://doi.org/10.1007/s12206-021-0524-1

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  • DOI: https://doi.org/10.1007/s12206-021-0524-1

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