基于多光谱成像技术的火焰温度及辐射率分布测量方法研究

doi:10.3964/j.issn.1000-0593(2023)11-3644-09

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Abstract Flame combustion parameters can directly reflect the flame combustion state and diagnose, predict and optimize the combustion process. The accurate measurement of flame combustion temperature and emissivity is of great importance for building combustion models, optimizing combustion processes and controlling pollutant emissions. With the development of digital image technology and spectroscopy, multispectral imaging technology has been gradually applied to flame combustion temperature and emissivity measurement. For the problems of low spatial resolution of the spectrometer and low spectral resolution of RGB color camera, multispectral imaging technology can obtain flame spectral images with both spatial and spectral resolution and realize temperature and emissivity distribution measurement of flame, which has the advantages of high spatial and spectral resolution, fast response and wide temperature range. Here, the temperature and emissivity measurement method of flame based on multispectral imaging technology was proposed.The standard high-temperature blackbody radiation experimental measurement system was built to carry out the high-temperature blackbody radiation response coefficient calibration experiments for the 665～960 nm band of multispectral imaging camera. The 25 band spectral response calibration coefficient of multispectral imaging camera was obtained, and the relationship between the instrument response value and theoretical radiation intensity at each band of multispectral imaging camera was established by fourth-order polynomial fitting. The measurement-validated experiment of multispectral imaging technology was carried out. The relative deviation of temperature and emissivity measurement is less than 1% and 4%, respectively. The flame multispectral imaging measurement system was established with a candle flame as the research object. The multispectral radiation images of the candle flame were obtained, and the temperature and emissivity distribution measurement was realized based on Planck's radiation law parameter fitting method.The measurement results show that the temperature and emissivity in the vertical plane of the central area of flame are higher than those in the upper and bottom in the vertical plane of flame; the range of flame temperature measurement results is about 1 350～2 050 K and the highest temperature in the central area is approximately 2 050 K; the range of flame emissivity measurement results is about 0.04～0.36, and the highest emissivity in the central area is 0.36. The measurement results are consistent with the candle flame-burning process and the distribution pattern of radiation characteristics.

Key words：Multispectral imaging; Combustion diagnostics; Radiation temperature measurement; Candle flame; Flame emissivity distribution

Received: 2022-06-14 Accepted: 2022-11-02

ZTFLH:

O433.1

Corresponding Authors: YANG Bin E-mail: yangbin@usst.edu.cn

Cite this article:

WANG Wen-song,PEI Chen-xi,YANG Bin, et al. Flame Temperature and Emissivity Distribution Measurement MethodBased on Multispectral Imaging Technology[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(11): 3644-3652.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2023)11-3644-09 OR https://www.gpxygpfx.com/EN/Y2023/V43/I11/3644

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