Sound sources in premixed flames
Source TitleProceedings of the Australian Combustion Symposium
PublisherANZ section of the Combustion Institute
University of Melbourne Author/sTalei, Mohsen
Document TypeConference Paper
CitationsTalei, M. (2019). Sound sources in premixed flames. Proceedings of the Australian Combustion Symposium, ANZ section of the Combustion Institute.
Access StatusOpen Access
ARC Grant codeARC/DE180100416
This paper presents a technical review of our understanding of the mechanism of sound generation by premixed flames. Examples from direct numerical simulation (DNS) studies undertaken at the University of Melbourne are provided. Furthermore, the implications of the findings for developing accurate models that can predict combustion-generated sound are discussed. This paper demonstrates that flame-flame interactions referred to as ‘flame annihilation’ are significant sources of sound in premixed flames. These localised events feature several unique characteristics that cannot be explained with existing turbulent flame theories. It is shown that flame acceleration during annihilation has a significant contribution to the radiated sound. Therefore, in the context of modelling, it is essential to predict the flame displacement speed during annihilation as accurately as possible. Analysis of the DNS data shows promising avenues to meet this requirement.
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