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Numerical Studies on the Impact of Equivalence Ratio Oscillations on Lean Premixed Flame Characteristics and Emissions

Christina Schrödinger ; Christian Oliver Paschereit ; Michael Oevermann (Institutionen för tillämpad mekanik, Förbränning)
Combustion Science and Technology (0010-2202). Vol. 186 (2014), 10-11, p. 1392-1409.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Heat release rate; Equivalence ratio fluctuations; Turbulence modeling; Pollutant emissions; Burning velocity; Linear eddy model


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Denna post skapades 2014-10-17. Senast ändrad 2014-12-08.
CPL Pubid: 204420

 

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