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A Four-Step Global Reaction Mechanism for CFD Simulations of Flexi-Fuel Burner for Gas Turbines

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.660
pages 616-627

A. Abou-Taouk
Department of Applied Mechanics, Chalmers University of Technology, Horsalsvagen 7A, 41296 Gothenburg, Sweden; Cleanergy AB, Therese Svenssons gata 15, SE-41755, Gothenburg, Sweden

I. R. Sigfrid
Department of Energy Sciences, Lund University, Ole Romers vag 1, 221 00 Lund, Sweden

R. Whiddon
Department of Combustion Physics, Lund University, Box 118, 221 00 Lund, Sweden

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

Abstract

A reduced four-step scheme for Computational Fluid Dynamics (CFD) analysis is presented here in the context of industrial type laboratory combustor. The present scheme has been optimized for a syngas mixture consisting of 10% CH4, 22.5% CO and 67.5% H2 by volume, and for a methane-air mixture. The optimization of the global scheme is done by comparing with the detailed San Diego mechanism using perfectly stirred reactor (PSR) and laminar flame speed calculations. The four-step global scheme has been applied to the CFD analysis of a swirl-stabilized flexi-fuel burner. Both reacting and non-reacting cases has been computed, using a hybrid Unsteady RANS/Large Eddy Simulation (URANS/LES) technique. Comparisons between CFD results and experimental data in the form of Particle Image Velocimetry (PIV) data, Planar Laser Induced Fluorescence (pLIF) and Proper Orthogonal Decomposition (POD) analysis from an atmospheric burner test rig at Lund University are presented. The CFD results scheme show good agreement with the experimental data.

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