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Numerical Modeling of Porous Burner

Saediamiri, Meghdad | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39495 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Saeed; Saeedi, Mohammad Hassan
  7. Abstract:
  8. Porous burner technology has many advantages in comparison with conventional burners such as higher burner thermal performance, lower pollutants emission, high power ranges, fuel flexibility, compact geometry and higher turn down ratios. These kinds of burners are made of preheated porous combustion zone and combustion porous zone that have different thermophysical and geometrical properties. In this work, the transient one-dimensional multi-step premixed laminar reacting flows in a two-stage porous media burner have been investigated. The combustible mixture is considered H2-Air (9 species and 19 reactions) and CH4-Air (22 species and 49 reactions). In porous media, without lateral wall heat transfer, radial flow properties variation is negligible in comparison with the axial variation of properties, thus, the cross sectional area of the burner is considered variant. Gas phase multi-component transport properties (thermal conductivity, multi-component diffusion and thermal diffusion) are calculated by collision integrals that have been obtained by the Stockmayer potential. Also, the effect of radiative heat transfer mechanism is modeled by adding an effective conduction heat transfer coefficient to the conductivity of solid phase. The solid and gas phases are treated separately, but coupled via a convective heat transfer term in their energy equations. In addition, the conservation of species equations is coupled with gas phase energy equation via temperature and production rate of each species. The density distribution is calculated by the ideal gas state equation as a function of temperature and species concentrations; then the velocity field is obtained by cross sectional area and density field. Finally, a parametric study, in which the properties of the two stages of porous burner are varied independently, is presented
  9. Keywords:
  10. Porous Media Burner ; Combustion ; Numerical Solution ; Multistep Reaction ; Multicomponent Transport Properties

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