A numerical study of multiline-multiband tomographic absorption spectroscopy for axisymmetric flames

Kin-Pang Cheong; Liuhao Ma; Kun Duan; Wei Ren

doi:10.1117/12.2590702

18 March 2021 A numerical study of multiline-multiband tomographic absorption spectroscopy for axisymmetric flames

Kin-Pang Cheong, Liuhao Ma, Kun Duan, Wei Ren

Author Affiliations +

Proceedings Volume 11780, Global Intelligent Industry Conference 2020; 117801J (2021) https://doi.org/10.1117/12.2590702
Event: Global Intelligent Industry Conference 2020, 2020, Guangzhou, China

Abstract

A multiline-multiband absorption spectroscopy strategy is proposed and numerically studied in the present work to address the limited detection range of the conventional two-line thermometry. The new method utilizes the information and spectral characteristics of multiple transitions at multiple bands to derive temperature and species concentration. Various combinations of absorption lines are evaluated when measuring the combustion fields of a standard McKenna flame and a jet-in-hot-coflow flame. Results show that the proposed multiline-multiband absorption spectroscopy with the tomographic algorithm is effective in resolving the high-gradient region of the flames. Wide detection range and high accuracy are achieved simultaneously in the tomographic reconstructions of the thermochemical profiles. Using a 3-line scheme, the temperature and species profiles at the temperature range from 300 K to 2000 K are successfully reconstructed. The present study demonstrates the great potential of multiline-multiband absorption spectroscopy for flames with a high gradient region or a steep boundary layer.

Citation Download Citation

Kin-Pang Cheong, Liuhao Ma, Kun Duan, and Wei Ren "A numerical study of multiline-multiband tomographic absorption spectroscopy for axisymmetric flames", Proc. SPIE 11780, Global Intelligent Industry Conference 2020, 117801J (18 March 2021); https://doi.org/10.1117/12.2590702

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