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Investigation of EDC Turbulent Combustion Model for Flameless Combustion Regime in a Certain Combustion Chamber

Hadian, Amir Hossein | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51409 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Farshchi, Mohammad
  7. Abstract:
  8. Reducing carbon emissions emanated from combustion of fossil fuels is a challenging problem and consumes huge amount of money that is put into research every year. Nitrogen oxides are among the most important pollutants which have been at the center of attention of industries and international environment protection organizations, especially due to their increased production by commercial aircrafts at higher altitudes of the atmosphere. Flameless is a combustion regime that has been independently discovered by different research teams while working on reducing nitrogen oxides from burning fossil fuels in the early 1990s, and afterwards has been studied for its exclusive characteristics in noise, carbon monoxide, and energy consumption reduction in addition to its excellent suppression of nitrogen oxides. Its main features are lack of a visible flame and extremely low levels of noise. Modeling such form of combustion is challenging as still we have no combustion model describing its physics. However, it has been shown that EDC (Eddy Dissipation Concept) works quite well for it. Why EDC is successful in modeling flameless combustion is not known, however, it is obvious that such understanding would be achieved only when both flameless combustion and EDC model are fully understood. At Aerospace Department of Sharif University of Technology, a flameless combustion chamber has been studied experimentally and numerically using FLUENT software. In the current research, due to the advances in computer technology, a more precise numerical solution has been obtained which proves that in contrast to our previous understanding, the flow and combustion fields are actually transient in the chamber. Furthermore, the importance of short-lived intermediate chemical species in flameless combustion is verified. EDC model was better understood by referring to the original papers of its creators between 1960 and 1980. It was recognized that the key to the understanding of flameless combustion is the fine scale structures of turbulence and any approach to solve this combustion field should consist analyzing numerous small reactors which turbulence builds and destroys constantly
  9. Keywords:
  10. Exhaust Gases Recirculation ; Numerical Simulation ; Eddy Dissipation Concept (EDE) ; Turbulent Combustion ; Flamless Combustion

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