Investigation of Equivalence Ratio Fluctuations on the Dynamics of Turbulent Lean Premixed Methane/Air Flames with a Linear-Eddy Model
Artikel i vetenskaplig tidskrift, 2015

Heat release fluctuations generated by equivalence ratio fluctuations may interact with the acoustics of a gas turbine combustion chamber leading to unwanted combustion instabilities, which remains a critical issue in the development of low emission, lean premixed gas turbine combustors. The present article addresses this topic by numerical investigations of one-dimensional lean premixed methane/air flames subject to prescribed sinusoidal equivalence ratio fluctuations. Compared to previous investigations, we focus on turbulent conditions and emission predictions using the one-dimensional linear-eddy model (LEM) and detailed chemistry. Within the limitations of the one-dimensional LEM the approach allows to investigate the fully non-linear regime of flame response to equivalence ratio fluctuations under turbulent conditions. Results for different forcing amplitudes and turbulence levels indicate a strongly non-linear behavior for high forcing amplitudes.


Michael Oevermann

Chalmers, Tillämpad mekanik, Förbränning och framdrivningssystem

Christina Schrödinger

Technische Universität Berlin

Christian Oliver Paschereit

Technische Universität Berlin

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

1612-2909 (ISSN) 1860-0824 (eISSN)

Vol. 127 213-227





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Strömningsmekanik och akustik



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