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Large Eddy Simulation of Turbulent Non-Premixed Swirling Flames

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1260
pages 593-596

K. K. J. Ranga Dinesh
School of Engineering, Cranfield University, Cranfield; Engineering Department, Lancaster University Lancaster, LA1 4YR, UK

Weeratunge Malalasekara
Wolfson School of Mechanical, Electrical and Manufacturing Engineering - Loughborough University, Loughborough, LE11 3TU, United Kingdom

Salah S. Ibrahim
Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, Leicester, LE11 3TU, UK

Michael P. Kirkpatrick
School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia

Аннотация

In this study Large Eddy Simulation (LES) technique has been applied to predict a selected swirling flame based on the Sydney swirl burner. The predicted flame is known as SMH1 having a swirl number of 0.32 and fuel of CH4:H2 (50:50) by volume. In the numerical methods, the governing equations for mass, momentum and mixture fraction are solved on a structured Cartesian grid with 1 million cells. Smagorinsky eddy viscosity model with localized dynamic procedure is used as the sub-grid scale turbulence model. The conserved scalar mixture fraction based thermo-chemical variables are described using a steady laminar flamelet model.
With appropriate inflow, outflow boundary conditions and relatively fine grid resolutions, LES predicts the upstream recirculation zone and key flow features. The predictions show good agreement with experimental measurements for the velocity field. Some discrepancies in mixture fraction predictions were observed overall the predicted mean temperature and species concentrations are also reasonably good and agree with experimental measurements.

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