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Simultaneous measurements of temperature, CO2 concentration and soot volume fraction in counterflow diffusion flames using a single mid-infrared laser

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Abstract

We report on the development of a mid-infrared laser sensor near 4172 nm for in-situ, quantitative and simultaneous measurements of temperature, CO2 concentration and soot volume fraction (SVF) in counterflow diffusion flames under different CO2 dilution (0–30%) conditions. In the experiment, multiline absorption spectroscopy was used for sensitive detection of temperature and CO2 concentration. A novel intensity modulation method together with reconstructed arbitrary waveform was performed to achieve reliable and simultaneous SVF measurement based on laser extinction. Spatially resolved measurements of thermochemical and sooting structures were achieved through tomographic reconstruction. The measured temperature and CO2 concentration were in good agreement with numerical predictions using a well-validated kinetic model. SVF profile also agreed well with the reference laser-induced incandescence soot measurement. The sensor was further applied to quantify the effects of CO2 dilution on flame thermochemical structure and soot formation. The experimentally determined temperature and SVF were both observed to decrease with the increase of CO2 no matter which dilution mode (fuel/oxidizer side or both sides) was applied. Soot formation was significantly suppressed when the dilution was applied to oxidizer side. The present sensor has good potential for multi-parameters diagnostics in sooting flames by providing a solution with compact optical setup and superior precision.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (51976142, 52106221), Fundamental Research Funds for the Central Universities (WUT:2021IVA016), and Startup funding of Wuhan University of Technology (40120607). We also thank Dr. Xunchen Liu from Shanghai Jiaotong University for providing the custom made etalon that is used in the present work.

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  1. Laboratory for Advanced Combustion, School of Automotive Engineering, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    Gang Sheng, Liuhao Ma, Daxin Wen & Yu Wang

  2. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    Liuhao Ma & Yu Wang

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  1. Gang Sheng
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Sheng, G., Ma, L., Wen, D. et al. Simultaneous measurements of temperature, CO2 concentration and soot volume fraction in counterflow diffusion flames using a single mid-infrared laser. Appl. Phys. B 128, 62 (2022). https://doi.org/10.1007/s00340-022-07784-0

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