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NO x formation in H 2-CH 4 blended flame under MILD conditions

Mardani, A ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1080/00102202.2012.663991
  3. Publisher: 2012
  4. Abstract:
  5. In this article, NO production mechanisms for CH 4-H 2 combustion under MILD (moderate or intense low-oxygen dilution) conditions are studied using CDF and also zero-dimensional well stirred reactor (WSR) analysis. A H 2/CH 4 jet into a heated and diluted coflow is modeled in CFD analysis. The RANS equations with modified k equations are solved in an axisymmetric 2D computational domain. The GRI2.11 full mechanism is considered to represent the chemical reactions. The effects of oxidizer oxygen concentration, fuel hydrogen content, and fuel jet Reynolds number are studied on NO formation reactions. Results show that the measurements are predicted with an acceptable accuracy. The NNH and N 2O routes are the most important pathways in NO formation under MILD conditions. An increase in oxidizer O 2concentration or decrease in fuel hydrogen content addressesthe decrease in importance of the mentioned NO formation routes
  6. Keywords:
  7. CFD ; NO x ; Axisymmetric ; CFD analysis ; Co-flow ; Computational domains ; Fuel jet ; Hydrogen contents ; MILD ; NO formation ; Non-premixed ; Oxygen concentrations ; Production mechanisms ; RANS equation ; Well-stirred reactors ; Zero-dimensional ; Computational fluid dynamics ; Hydrogen ; Methane ; Oxygen ; Reynolds number ; Fuels
  8. Source: Combustion Science and Technology ; Volume 184, Issue 7-8 , Aug , 2012 , Pages 995-1010 ; 00102202 (ISSN)
  9. URL: http://www.tandfonline.com/doi/abs/10.1080/00102202.2012.663991