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Numerical Investigations of the Noise Sources Generated in a Swirl Stabilized Flame

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Abstract:

Compressible Large Eddy Simulations (LES) have been performed to study the reacting flow field of a typical industrial double concentric swirl burner. A turbulent flame speed closure (TFC) was implemented into the code to model the premixed flame. The results have been analysed with respect to the acoustic sources used in Lighthill's acoustic analogy. It is shown, that the noise sources generated by the combustion process are significantly larger than the sources caused by the aerodynamics. A spectral analysis allowed to detect two dominant frequencies in the swirling flow field, which are suspected to contribute to the noise emissions. The frequencies are caused by the eigenfrequency of the burner and an oscillating coherent structure near the burner outlet.

Document Type: Research Article

DOI: http://dx.doi.org/10.3813/AAA.918166

Publication date: May 1, 2009

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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