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Improving the Measurement of the Chemiluminescence of Methylidyne (CH*)Species with the Help of Thermometry by Soot Pyrometry Method

Asadollahi, Mohsen | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57378 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Salehi, Mohammad Mahdi; Mardani, Amir
  7. Abstract:
  8. This research introduces temperature measurement by a non-intrusive pyrometric method of the ratio of two colors of soot. For pyrometry, the spectral sensitivity of the Nikon D7100 camera was obtained by developing a neural network based on the results of photographing colored papers and their spectrum, and this camera was used for temperature measurement. Based on the dependence of soot radiation on temperature and the spectral sensitivity of the camera, a calibration chart has been extracted on the ratio of the green channel to the red channel of the camera with the soot temperature, which is used to produce the temperature contour using the flame image. The temperature contour of diffusion flames with natural gas and ethane fuels in different conditions has been calculated and presented; with a low equivalence ratio, a little soot is formed in the flame and finally oxidized, and with a high equivalence ratio, a lot of soot is formed in the combustion process and leaves the flame without oxidation. CH* is one of the important radicals in the combustion process, which can be used to obtain the geometric parameters and mixing of the flame. This study indicates a method for measuring CH* luminescence using soot temperature contour. The results of CH* luminescence contours using the presented method have been compared with similar methods of measuring CH* luminescence without considering temperature changes in the flame field. Also both methods provide acceptable results in flames containing low soot, but in flames containing a lot of soot, the presented method demonstrates much better results
  9. Keywords:
  10. Optical Non-Intrusive Method ; Chemiluminescence ; Soot ; Pyrometry ; Camera Spectral Sensitivity ; Thermometry ; Methylidyne Species

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