Journal article
A direct numerical simulation study of frequency and Lewis number effects on sound generation by two-dimensional forced laminar premixed flames
M Talei, ER Hawkes, MJ Brear
Proceedings of the Combustion Institute | ELSEVIER SCIENCE INC | Published : 2013
Abstract
This paper presents a numerical investigation of sound generation by two-dimensional laminar premixed flames. Direct numerical simulation (DNS) is used to study low Mach number flames with different Lewis numbers, namely Le = 0.5, 1 and 2, excited by velocity perturbations at the inflow boundary for a range of frequencies. At intermediate forcing frequencies, 'flame pinch-off' and 'flame island burn-out' are observed as strong, monopolar sound sources for Le = 1 and 2. However, these events produce almost no sound for Le = 0.5. Dowling's reformulation of Lighthill's acoustic analogy is used to investigate the contribution of heat release rate fluctuations to the radiated sound. A comparison ..
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Funding Acknowledgements
This work is supported by the Australian Research Council. The authors acknowledge the generous support of the European Centre for Research and Advanced Training in Scientific Computation CERFACS, http://www.cerfacs.fr), in providing the authors with the source code for NTmix. Use of the facilities of the Victorian Partnership for Advanced Computing (VPAC) and National Computational Infrastructure (NCI) is also acknowledged.