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Numerical Study on MILD Combustion Enhancement through Injecting Plasma

Khanehzar, Andisheh | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50784 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Mardani, Amir
  7. Abstract:
  8. In this thesis numerical investigation on the effect of injecting plasma into the MILD combustion regime which is based on the low oxygen dilution and high preheated temperature, were carried out. The burner which was utilized in this study is a co-flow burner, consists of three coaxial channels. From the center to the outside, there is a fuel jet at the center part, a co-flowing dielectric barrier discharge (DBD), and a preheated air section that is vitiated. The DBD that was used in this study is generated between two coaxial electrodes of which the outer one (conical copper electrode) is covered with a dielectric material made of quartz. The burner is modeled in a 2D-axisymmetric computational domain. In order to describe the turbulence-chemistry interaction, the EDC model is used and the GRI 3.0 full mechanism is considered. The model was simulated using realizable κ˗ε equations and a non-equilibrium wall function. After checking the accuracy of the predictions by comparing the results with measurements, at first, the different pathways (thermal, kinetic and transport effects) of the plasma assisted MILD combustion were investigated. In the next step, the general effect of the plasma and the effect of parameters such as the fuel and oxidizer composition, inlet velocity for plasma reactor, preheating temperature on MILD combustion were studied. It is found that applying the plasma discharge to the flame region leads to improve the mixing, increase heat release rate as well as the reaction and ignition intensity while increasing the flame length and reducing its lift-off. It is also shown that under plasma injection the MILD combustion region occurs in a wider area
  9. Keywords:
  10. Moderate or Intense Low Axygen Dilution (MILD) ; Plasma ; Dielectric-Barrier Discharge (DBD)Plasma Actuator ; Preheating ; Dilution ; Turbulence Model

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