The effect of equivalence ratio on sound generation by turbulent premixed flames

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    Author
    Haghiri, A; TALEI, M; Brear, MJ; Hawkes, ER
    Editor
    Yang, Y; Smith, N
    Date
    2015
    Source Title
    Proceedings of the Australian Combustion Symposium
    Publisher
    The Combustion Institute Australia & New Zealand Section
    University of Melbourne Author/s
    Talei, Mohsen; Haghiri, Ali; Brear, Michael
    Affiliation
    Mechanical Engineering
    Metadata
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    Document Type
    Conference Paper
    Citations
    Haghiri, A., TALEI, M., Brear, M. J. & Hawkes, E. R. (2015). The effect of equivalence ratio on sound generation by turbulent premixed flames. Yang, Y (Ed.) Smith, N (Ed.) Proceedings of the Australian Combustion Symposium, pp.320-323. The Combustion Institute Australia & New Zealand Section.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/258643
    Abstract
    Direct numerical simulation (DNS) is used to study sound generation by open, turbulent premixed flames. Two cases of methane/air combustion with different equivalence ratios (φ = 0.7 and 1 ) are considered. The computational grid is set up such that both the near and far fields are fully resolved. A simple-chemistry model is used to reduce the computational cost. The results show that flame annihilation events are significant monopolar sources of noise. Spectral analysis of the radiated sound shows a broadband spectrum where the observed frequency of the peak amplitude matches that observed experimentally. Furthermore, it is observed that the stoichiometric flame (φ =1) is a much stronger source of noise than the lean flame (φ = 0.7 ).

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