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ISSN オンライン: 2642-0554

LARGE EDDY SIMULATION OF A HIGHLY TURBULENT METHANE FLAME: APPLICATION TO THE DLR STANDARD FLAME

Andreas M. Kempf
Dept. of Mechanical Engineering Institute for Energy- and Powerplanttechnology TU-Darmstadtr Petersenstr. 30 64289 Darmstadt, Germany; Institute for Combustion and Gasdynamics (IVG) Chair for Fluid Dynamics University of Duisburg-Essen Duisburg, 47048

Christoph Schneider
Chair of Energy and Powerplant Technology, Department of Mechanical Engineering, Darmstadt University of Technology, Petersenstr. 30, 64287 Darmstadt, Germany

Amsini Sadiki
Institute of Energy and Power Plant Technology, Technische Universität Darmstadt, 64287 Darmstadt, Germany

Johannes Janicka
Institute of Energy and Power Plant Technology, TU Darmstadt, Jovanka-Bontschits-Strasse 2, 64287 Darmstadt, Germany; Darmstadt Graduate School of Excellence Energy Science and Engineering, TU Darmstadt, Jovanka-Bontschits-Strasse 2, 64287 Darmstadt, Germany

要約

A Large Eddy Simulation in three dimensions is applied for the study of a highly turbulent methane flame. As target for this investigation, a flame with simple flow-field that burns without stability problems was a prerequisite, while this flame should not form soot to simplify laser-diagnostics. A good choice for this can be the DLR-Standard-Flame.
In the numerical method for the flow, fluctuations of density in space and time are considered to only depend on chemistry, not on pressure. To represent the sub-grid scale stresses and scalar flux, a Smagorinsky model is used in which the coefficient is determined by the dynamic Germano procedure. Density, temperature and species concentrations are related to the mixture fraction by a flamelet model. Subgrid fluctuation of the mixture fraction is described by a β - function.
The computed results are found in overall agreement with the experimental data. Only close to the nozzle of the fuel-jet gradients are too big to be resolved by the underlying numerics.