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Pressure wave generation from perturbed premixed flames

Published online by Cambridge University Press:  17 May 2016

Mathieu Blanchard ,
Peter J. Schmid ,
Denis Sipp  and
Thierry Schuller
Mathieu Blanchard*
Affiliation:
Laboratoire d’Hydrodynamique (LadHyX), Ecole Polytechnique, 91128 Palaiseau, France TEYS, Centre de Recherche du Bouchet, Héraklès Safran Group, 91710 Vert-Le-Petit, France
Peter J. Schmid
Affiliation:
Department of Mathematics, Imperial College London, London SW7 2AZ, UK
Denis Sipp
Affiliation:
ONERA-DAFE, 8 Rue des Vertugadins, 92190 Meudon, France
Thierry Schuller
Affiliation:
Laboratoire EM2C, CNRS, Centrale-Supélec, Université Paris Saclay, Grande Voie des Vignes, 92295 Châtenay-Malabry, France
*
†Email address for correspondence: mathieu.blanchard@herakles.com
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Abstract

Numerical simulations and perturbation analysis of a radially imploding laminar premixed flame are used to study the mechanisms responsible for the generation of pressure fluctuations at flame fronts for various Lewis numbers. The relative importance of mechanisms based on unsteady heat release and on vorticity is investigated using an optimization methodology. Particular attention is paid to the influence of non-axisymmetric conditions and local flame curvature. It is shown that vorticity-based noise generation prevails for high-wavenumber, non-axisymmetric disturbances at all curvatures, while heat-release-driven noise generation dominates the axisymmetric and low-wavenumber regimes. These results indicate that short-wavelength vorticity waves actively participate in flame acoustic activity and can surpass acoustic output mechanisms based on heat-release fluctuations in the vicinity of the flame front.

JFM classification

Reacting Flows: Combustion Acoustics: Hydrodynamic noise Reacting Flows: Laminar reacting flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 797 , 25 June 2016 , pp. 231 - 246
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Copyright
© 2016 Cambridge University Press 

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