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Two-dimensional numerical investigation of a micro combustor

Irani Rahaghi, A ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. Publisher: 2010
  3. Abstract:
  4. In this paper, a two-dimensional numerical approach is used to study the effect of 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 is used. The transient gas phase energy and species conservation equations result in an Advection-Diffusion-Reaction system that leads to two stiff systems of PDEs. In the present work, the computational domain is solved through the Strang splitting method, which is suitable for a nonlinear stiff system of PDEs. A 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 temperature and active radicals along the micro combustor. In addition, the slip flow and thermal creep boundary conditions in the studied scales have no significant effect on the different parameters, but changes slightly the cross section profiles of the temperature. The 2-D numerical results show that the micro combustion must be treated as two dimensional
  5. Keywords:
  6. Advection-diffusion-reaction ; Computational domains ; Conservation equations ; Convective heat transfer Coefficient ; Cross-section profile ; External convection ; Flow characteristic ; Gasphase ; Heat transfer rate ; Mass flow rate ; Mass fraction ; Micro combustion ; Micro-scales ; Mixture velocity ; Multi-step ; Numerical ; Numerical approaches ; Numerical investigations ; Numerical results ; Premixed ; Slip flow ; Stiff systems ; Strang splitting ; Thermal creep ; Velocity equation ; Boundary conditions ; Combustion ; Computational fluid dynamics ; Creep ; Heat convection ; Heat transfer coefficients ; Two dimensional ; Combustors ; Convection ; Heat transfer ; Numerical model ; Two-dimensional modeling
  7. Source: Scientia Iranica ; Volume 17, Issue 6 B , December , 2010 , Pages 433-442 ; 10263098 (ISSN)
  8. URL: http://www.sid.ir/en/VEWSSID/J_pdf/955201006BM06.pdf