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Flame soot absorption coefficient and temperature reconstruction through line-of-sight attenuation and light field imaging

Ling, Tianxiang, Chen, Guoqing, Hossain, Md. Moinul, Qi, Qi, Zhang, Biao, Xu, Chuanlong (2024) Flame soot absorption coefficient and temperature reconstruction through line-of-sight attenuation and light field imaging. Optics and Lasers in Engineering, 178 . Article Number 108219. ISSN 0143-8166. E-ISSN 1873-0302. (In press) (doi:10.1016/j.optlaseng.2024.108219) (KAR id:105503)

Abstract

The accuracy and efficiency of 3-D flame temperature field reconstruction using the light field imaging technique heavily depend on soot radiation characteristics. In this study, we employ the line-of-sight attenuation method to reconstruct the soot absorption coefficient distribution in a pure absorbing flame. Utilizing these soot absorption coefficients, the radiative transfer equation is effectively transformed within the framework of the light field imaging technique into a linear inverse problem and also outlines the flame boundary. This proposed strategy reduces the unwanted detection rays significantly, thus eliminating the extensive computational processing. Consequently, the proposed approach substantially enhances the accuracy and efficiency of flame temperature reconstruction. Numerical simulations were carried out on a bimodal asymmetric flame to validate the noise tolerance capabilities, investigate the effects of varying voxel numbers on flame division and carry out a comparative study. Experimental studies were also conducted to reconstruct flame temperature and soot absorption coefficient distributions under different combustion operating conditions. Thermocouple measurements were performed and compared with the reconstructed temperatures. Outcomes achieved from both numerical simulations and experimental studies demonstrate the feasibility, accuracy and robustness of the proposed method.

Item Type: Article
DOI/Identification number: 10.1016/j.optlaseng.2024.108219
Uncontrolled keywords: Line-of-sight attenuation; Light field imaging; Soot absorption coefficient; Flame temperature; 3-D reconstruction
Subjects: Q Science
Q Science > Q Science (General)
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Funders: National Natural Science Foundation of China (https://ror.org/01h0zpd94)
Depositing User: Moinul Hossain
Date Deposited: 01 Apr 2024 12:05 UTC
Last Modified: 03 Apr 2024 03:37 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/105503 (The current URI for this page, for reference purposes)

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