Direct Numerical Simulations of turbulent flames to analyze flame/acoustic interactions

Direct Numerical Simulations (DNS) are becoming increasingly important as a source of quantitative information to understand turbulent reacting flows. For the present project DNS have been mainly used to investigate in a well-defined manner the interaction between turbulent flames and isolated acoustic waves. This is a problem of fundamental interest with practical applications, for example for a better understanding of combustion instabilities. After developing a specific version of the well-known Rayleigh’s criterion, allowing to investigate local amplification or damping of an acoustic pulse interacting with a reaction front, extensive investigations have been carried out. The present publication summarizes the main findings of all these studies and describes in detail the underlying numerical and physical models, in particular those used to describe chemical reactions. Post-processing of DNS data in the light of turbulent combustion modeling is also discussed. The results illustrate the complexity of the coupling between reaction fronts and acoustics, since amplification and damping appear mostly side by side, as alternating layers. The influence of individual reactions and species on the damping process can also be quantified in this manner. This publications concludes with perspectives towards higher turbulence levels and effects of differential diffusion.

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