The effect of equivalence ratio on sound generation by turbulent premixed flames
AuthorHaghiri, A; TALEI, M; Brear, MJ; Hawkes, ER
EditorYang, Y; Smith, N
Source TitleProceedings of the Australian Combustion Symposium
PublisherThe Combustion Institute Australia & New Zealand Section
Document TypeConference Paper
CitationsHaghiri, 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 StatusOpen Access
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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