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PDF MODELING STRATEGIES FOR LES OF A BLUFF-BODY STABILIZED SWIRL COMBUSTOR USING PREMIXED GENERATED MANIFOLDS

Clemens Olbricht
Department of Energy and Powerplant Technology, Darmstadt University of Technology, Petersenstr. 30, 64287 Darmstadt, Germany

Frederik Hahn
Institute for Energy and Power Plant Technology, Darmstadt University of Technology Petersenstr. 30, D-64287 Darmstadt, Germany

Anja Ketelheun
Institute for Energy and Power Plant Technology, Darmstadt University of Technology Petersenstr. 30, D-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

Resumo

In this publication a bluff-body stabilized swirled nonpremixed methane-air flame of the Sydney flame series is investigated. Large Eddy Simulation (LES) combined with a progress variable approach based on steady laminar premixed flamelets is applied to this configuration. To account for sub grid scale interactions of turbulence and chemistry probability density function (PDF) modeling using presumed β-PDF for the mixture fraction was used. Two different PDF approaches were applied to Premixed Generated Manifolds (PGM). No large differences were observed when using a sufficiently fine numerical grid. Therefore, only one PGM method was studied in more detail with a finer resolution. The comparison with radial velocity and scalar distributions from the experiments shows a good overall agreement.