Numerical Studies on the Impact of Equivalence Ratio Oscillations on Lean Premixed Flame Characteristics and Emissions
Paper i proceeding, 2014

Laminar and turbulent one-dimensional lean premixed methane-air flames subject to equivalence ratio oscillations are investigated numerically. For the turbulent simulations, the Linear Eddy Model is employed. Harmonic perturbations at various frequencies and with various amplitudes are considered and their influence on CO and NO emissions, heat release rate fluctuations, and burning velocity is evaluated. The results indicate a strongly nonlinear behavior of the flame response for high forcing amplitudes attributed to nonlinear effects due to the interaction of burning velocity and equivalence ratio oscillations leading to nonsinusoidal oscillations at the flame front. Furthermore, the turbulent cases reveal decreasing mean burning velocities and heat release rates with increasing amplitudes due to damping of turbulent fluctuations induced by the oscillations.

Burning velocity

Pollutant emissions

Heat release rate

Equivalence ratio fluctuations

Linear eddy model

Turbulence modeling


Christina Schrödinger

Technische Universität Berlin

Christian Oliver Paschereit

Technische Universität Berlin

Michael Oevermann

Chalmers, Tillämpad mekanik, Förbränning och framdrivningssystem

Combustion Science and Technology

0010-2202 (ISSN) 1563-521X (eISSN)

Vol. 186 10-11 1392-1409

The 24th International Colloquium on the Dynamics of Explosions and Reactive Systems
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