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Extending a Hybrid Finite-volume-element Method for Numerical Analysis of Reacting Flows and the Study of Soot Nanoparticles Formation and Growth

Ghafourizadeh, Majid | 2016

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 52168 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud
  7. Abstract:
  8. There are some parameters, which can affect the performance of a combustor less and more, e.g., fuel-oxidant mixing process, turbulence generation, combustion process, and so on. A stoichiometric reaction as a unique reaction, in which all the reactants are consumed to form the stable products, can be categorized as the most economic reaction. The majority of industrial combustion apparatus consumes hydrocarbon fuels and departs from ideal combustion conditions, which expects products like CO2 and H2O. Combustion by-products reduce the combustion efficiency and cause environmental damages and human health problems. To resolve the human health problems and environmental hazardous issues, the processes for forming these by-products should be well-understood. In this regard, soot as a combustion by-product with very hazardous effects needs much more attention. Aerosol modeling of soot nano-particles in reacting flows aims to understand the evolutionary process of soot formation and to improve the combustors efficiency. In this work, the combustion-generated soot nano-particles are numerically simulated considering chemical kinetics. For two-phase modeling of soot nano-aerosol, the governing transport equations of soot mass fraction and soot number density are solved considering the elementary reactions for the evolutionary process of soot formation, i.e. nucleation, surface growth, and surface oxidation. The radiation heat transfer of soot is also regarded due to its strong coupling to the flame structure. For detailed-chemistry modeling of gas-phase combustion process, different chemical mechanisms are employed considering elementary reactions of different chemical species. The energy conservation is regarded solving the governing transport equation of total enthalpy. The radiation heat transfer of different chemical species is also included in the energy conservation equation. A hybrid finite-volume-element method is extended and a novel advection flux scheme is developed considering the real physics of flow in the upwind-biased scheme. Regarding the soot nano-aerosol formation study, the effects of different parameters are investigated and various approaches for soot emission control in combustors are proposed. Hence, detailed-chemistry modeling of combustion and its coupling to soot nano-aerosol along with the approaches for soot emission control in combustors would be regarded as the outcomes of this research which provide good informative advices to the researchers who investigate pollution in aero-engine combustion chambers
  9. Keywords:
  10. Nano-Aerosol ; Reacting Flow ; Pollutant ; Numerical Analysis ; Finite Volume Element Method ; Carbon Nanoparticles

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