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One Dimensional and Two Dimensional Numerical Investigation of Micro Scale Combustion

Irani Rahaghi, Abolfazl | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39961 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Said; Saidi, Mohammad Hasan; Shafii, Mohammad Behshad
  7. Abstract:
  8. In this paper, a one-dimensional and two-dimensional numerical approach is used to study the effect of various parameters such as micro combustor height, mass flow rate and external convection heat transfer coefficient on the temperature and species mass fraction profiles. A premixed mixture of H2-Air with a multi-step chemistry (9 species and 19 reactions) is used. The transient gas phase energy and species conservation equations result in an Advection-Diffusion-Reaction system (A-D-R) that leads to two stiff systems of PDEs, which can not be solved by conventional Computational Fluid Dynamics (CFD) methods. In the present work, Strang splitting method, which is suitable for nonlinear stiff system of PDEs, is used. The revised boundary condition for the velocity equation is applied and its effect on the flow characteristics is investigated. The results show that both convection heat transfer coefficient and micro combustor height have a significant effect on the combustion and heat transfer rates in the micro scales. Also, increasing the convective heat transfer coefficient and decreasing the height and inlet mixture velocity, decreases the temperature and active radicals along the micro combustor. In addition, the slip flow and thermal creep boundary condition in the studied scales have no significant effect on the different parameters, but changes the cross section profiles of temperature a little. The numerical results show that the reactive flow has two-dimensional nature in the under investigated scales.

  9. Keywords:
  10. Combustion ; Slip Boundary Condition ; Micro-Scale Modeling ; Thermal Creep ; One Dimentional Numerical Simulation ; Two Dimentional Simulation

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