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LES modeling of premixed combustion using a thickened flame approach coupled with FGM tabulated chemistry
Authors:G Kuenne  A Ketelheun  J Janicka
Affiliation:aInstitute of Energy and Power Plant Technology, Darmstadt University of Technology, Petersenstrasse 30, 64287 Darmstadt, Germany;bCenter of Smart Interfaces, Darmstadt University of Technology, Petersenstrasse 32, 64287 Darmstadt, Germany
Abstract:Flamelet Generated Manifolds (FGM) tabulated chemistry is used in combination with a thickened flame approach to perform Large Eddy Simulation (LES) of premixed combustion. Two-dimensional manifolds are used to describe the chemistry by the mixture fraction and progress variable. Simulations of one-dimensional flames have been used to verify the coupling of the tabulated chemistry and the LES solver where important features like the grid dependence of flame propagation are carefully addressed. Finally, the method is applied to the turbulent flame of a premixed swirl burner including the complex geometry of the swirl nozzle. Results of the velocity, species and temperature are compared with experimental data. Thereby different efficiency functions are used to show the sensitivity related to this model parameter. Some aspects regarding dynamic thickening, numerical accuracy and computational efficiency are also addressed.
Keywords:IDT: 7  3  7  11
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