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Sound generation by turbulent premixed flames

Published online by Cambridge University Press:  19 March 2018

Ali Haghiri Open the ORCID record for Ali Haghiri [Opens in a new window] ,
Mohsen Talei ,
Michael J. Brear  and
Evatt R. Hawkes
Ali Haghiri*
Affiliation:
Department of Mechanical Engineering, University of Melbourne, VIC 3010, Australia
Mohsen Talei
Affiliation:
Department of Mechanical Engineering, University of Melbourne, VIC 3010, Australia
Michael J. Brear
Affiliation:
Department of Mechanical Engineering, University of Melbourne, VIC 3010, Australia
Evatt R. Hawkes
Affiliation:
School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney 2052, Australia
*
†Email address for correspondence: a.haghiri@student.unimelb.edu.au
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Abstract

This paper presents a numerical study of the sound generated by turbulent, premixed flames. Direct numerical simulations (DNS) of two round jet flames with equivalence ratios of 0.7 and 1.0 are first carried out. Single-step chemistry is employed to reduce the computational cost, and care is taken to resolve both the near and far fields and to avoid noise reflections at the outflow boundaries. Several significant features of these two flames are noted. These include the monopolar nature of the sound from both flames, the stoichiometric flame being significantly louder than the lean flame, the observed frequency of peak acoustic spectral amplitude being consistent with prior experimental studies and the importance of so-called ‘flame annihilation’ events as acoustic sources. A simple model that relates these observed annihilation events to the far-field sound is then proposed, demonstrating a surprisingly high degree of correlation with the far-field sound from the DNS. This model is consistent with earlier works that view a premixed turbulent flame as a distribution of acoustic sources, and provides a physical explanation for the well-known monopolar content of the sound radiated by premixed turbulent flames.

JFM classification

Acoustics: Aeroacoustics Reacting Flows: Combustion Turbulent Flows: Turbulent Flows
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 843 , 25 May 2018 , pp. 29 - 52
Copyright
© 2018 Cambridge University Press 

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Haghiri et al. supplementary movie 1

Animation of the dimensionless dilatation field on the central plane through the jet for Φ=1.0.

Download Haghiri et al. supplementary movie 1(Video)
Video 1.6 MB

Haghiri et al. supplementary movie 2

Animation of the dimensionless dilatation field on the central plane through the jet for Φ=0.7.

Download Haghiri et al. supplementary movie 2(Video)
Video 1.2 MB