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LARGE EDDY SIMULATION OF A LEAN PREMIXED LOW SWIRL BURNER

Mohammad Irannezhad
Department of Applied Mechanics, Chalmers University of Technology SE-41296 Gothenburg, Sweden

Lars-Erik Eriksson
Department of Applied Mechanics, Chalmers University of Technology, Horsalsvagen 7A, 41296 Gothenburg, Sweden

Resumo

Flow filed and flame front dynamics of a low swirl burner are investigated using numerical tools. Large eddy simulation and a flame capturing combustion model are applied to predict the flow field and the flame structure on two different computational domains and the results are compared to experimental data in order to recognize the most important phenomena in flame stabilization and dynamics. Investigations show that the flame dynamics are resulted from the large scale turbulence generated at the inlet of the fuel/air mixture and physical results are only attainable if this turbulence is generated in simulations by some means.