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Study on Optimization of the EDC Model for Highly Preheated and Diluted Condition

Nazari, Aslan | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49721 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Mardani, Amir
  7. Abstract:
  8. Moderate and Intense Low-oxygen Dilution(MILD) is the new member of combustion field. Highly preheated reactants and lowering the oxygen level in MILD combustion has some promising advantages. In this study the MILD burner, Jet-in-Hot-Coflow(JHC), is taken as the main test case. In this Research, Eddy Dissipation Concept combustion model ,introduced by Magnussen et al,is investigated in detail and governing equations are re-extracted. EDC combsution model due to moderate compuational cost in comparison with other combustion model and well prediction ability has drawn attention. Simulations on the Jet-in-Hot-Coflow(JHC) has shown the promising performance of the EDC combustion model. It seems that EDC combustion model can be optimized for MILD combustion regime. In this study, effect of characteristic frequency of the EDC combustion model is investigated and a parametric study of length scale and time scale with respect to Kolmogrov scales have been done. And finally a local coefficient approach based on local variables such as turbulence Reynolds number and Damkohler number have been developed and the relevant local model have been tested on the Adelaide Jet in Hot Coflow(JHC) burner and Delft Jet in Hot Coflow burner(DJHC). Results has shown the better performance of the local approach in simulation of the burner. The improvement is more sensible at the sections far from inlet
  9. Keywords:
  10. Extension ; Diffusion Flame ; Eddy Dissipation Concept (EDE) ; Combustion ; Moderate or Intense Low Axygen Dilution (MILD) ; Chemical - Thurbulence Interaction

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