Direct Numerical Simulation of a Gaussian acoustic wave interaction with a turbulent premixed flame |
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Authors: | Alain Laverdant Dominique Thévenin |
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Institution: | 1. Office National d''Études et de Recherches Aérospatiales (ONERA), 29, avenue de la Division Leclerc, BP 72, 92322 Châtillon-sous-Bagneux, France;2. Laboratory of Fluid Mechanics and Technical Flows, University of Magdeburg ‘Otto von Guericke’, Universitaetsplatz 2, 39106 Magdeburg, Germany |
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Abstract: | The interaction of a Gaussian negative pulse with a H2/O2/N2 turbulent premixed flame is examined using Direct Numerical Simulation (DNS). Transport properties and chemical kinetics are described in a very detailed manner. An extended nonlinear local Rayleigh's criterion, for laminar as well as turbulent, premixed or nonpremixed flames, is proposed. Situations in which amplification or attenuation occur are listed. Calculations of a turbulent flame are then carried out with and without an acoustic wave and results are recorded at the same time. The influence of acoustic wave/turbulent flame interaction is obtained by a simple difference. It is shown that longitudinal and transverse velocity components are perturbed by the turbulent flame. Moreover, the vorticity induced by the acoustic wave is observed to be weak. Finally, Rayleigh's criterion shows that wave amplification occurs punctually. To cite this article: A. Laverdant, D. Thévenin, C. R. Mecanique 333 (2005). |
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Keywords: | Computational fluid mechanics Combustion instability Rayleigh's criterion Turbulent premixed flame Mécanique des fluides numérique Instabilité de combustion Critère de Rayleigh Flamme turbulente prémélangée |
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