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Methylidyne (CH*)Chemiluminescence Measurement in Sooting Flames

Karbasi Shargh, Kamyab | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55213 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Salehi, Mohammad Mahdi; Mardani, Amir
  7. Abstract:
  8. In this study, using a non-interference experimental method, the chemical luminosity of CH* in co-flow diffusion flames with soot and using natural gas hydrocarbon in a laminar flow regime has been investigated. In addition to experimental research, in current research, numerical simulation has been used to extract information such as temperature field, mass fraction of species, and flow structure and comparison and validation with experimental results. Numerical simulation has been used to simulate the mechanism of CH* species formation. Two different mechanisms have been used. In addition, the Soot simulation model from the Moss-Brookes model and radiation heat transfer mechanism simulation from DO (Discrete Ordinates) model have been used. One of the detectors that can be used to study flame parameters is the radiation emitted from the flame such as chemical light. One of these species with Chemiluminescence characteristics is CH radical. This species is excited due to its participation in some reactions and becomes CH radical and returns to its ground state, some energy in the form of photons in the visible light interval (wavelength 431.5 nm) can therefore be detected by measuring the radiation from this species at the site of CH* formation. In this research, by using a digital camera and three optical filters 420, 430, and 440 nm, the generated flames are imaged and the resulting images are processed to eliminate the effects of light of other species affecting the radiation of the species such as soot and CO2*. The results indicate that the simultaneous use of two filters 420 and 440 nm compared to the use of these filters separately, to eliminate the effect of soot and other effective types are independent of changes in the temperature field of the soot, while the use of one filter To subtract radiation from the 430 nm filter, there are some errors in the final contours due to changes in the soot temperature field. Also, after verifying the experimental and numerical results with the previous research in this field, the results of the experimental and numerical methods are well matched
  9. Keywords:
  10. Chemiluminescence ; Optical Non-Intrusive Method ; Methylidyne Species ; Co-Flow Sooting Diffusion Flame

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