Investigation of Equivalence Ratio Fluctuations on the Dynamics of Turbulent Lean Premixed Methane/Air Flames with a Linear-Eddy Model
Journal article, 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.

Author

Michael Oevermann

Chalmers, Applied Mechanics, Combustion

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

Areas of Advance

Transport

Energy

Subject Categories

Other Engineering and Technologies

Energy Engineering

Fluid Mechanics and Acoustics

DOI

10.1007/978-3-319-11967-0_14

More information

Latest update

3/2/2020 1