Numerical identification of precessing vortex core in an airblast swirl burner using POD

Alireza Ghasemi Khourinia, J. B.W. Kok

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Abstract

Acoustic response and stability of swirl burners operating in lean conditions is of great interest considering the stricter emission regulations. Lean operating modes exhibit a heightened sensitivity to thermoacoustic instability. This paper is aimed at understanding the natural acoustic characteristic of a prefilming Airblast atomizer operating at pressurized conditions. The presence of a helical precessing vortex core and its corresponding frequency as well as the natural fluctuations in the turbulent reactive flow is simulated using a large eddy simulation approach. Proper orthogonal decomposition is used to extract the prominent flow structures and infer their associated time dynamics within the swirl burner. This analysis is performed in absence of any external forcing to the system and can provide some insight into the stable operating modes of the swirl atomizer.

Original languageEnglish
Title of host publication"Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021
EditorsEleonora Carletti, Malcolm Crocker, Marek Pawelczyk, Jiri Tuma
PublisherSilesian University Press
ISBN (Electronic)9788378807995
Publication statusPublished - 2021
Event27th International Congress on Sound and Vibration, ICSV 2021 - Virtual, Online
Duration: 11 Jul 202116 Jul 2021
Conference number: 27

Conference

Conference27th International Congress on Sound and Vibration, ICSV 2021
Abbreviated titleICSV 2021
CityVirtual, Online
Period11/07/2116/07/21

Keywords

  • Airblast atomizer
  • Non-premixed turbulent combustion
  • Proper orthogonal decomposition
  • Thermoacoustic instability

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