論文

査読有り
2015年

Short- and long-term dynamic modes of turbulent swirling premixed flame in a cuboid combustor

PROCEEDINGS OF THE COMBUSTION INSTITUTE
  • Kozo Aoki
  • ,
  • Masayasu Shimura
  • ,
  • Shinichi Ogawa
  • ,
  • Naoya Fukushima
  • ,
  • Yoshitsugu Naka
  • ,
  • Yuzuru Nada
  • ,
  • Mamoru Tanahashi
  • ,
  • Toshio Miyauchi

35
3
開始ページ
3209
終了ページ
3217
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.proci.2014.10.003
出版者・発行元
ELSEVIER SCIENCE INC

Direct numerical simulation (DNS) of hydrogen-air turbulent swirling premixed flame in a cuboid combustor is conducted to investigate thermoacoustic instability and dynamic modes of turbulent swirling premixed flame in combustors. A detailed kinetic mechanism and temperature dependency of physical properties are considered in DNS. Two swirl number cases of 0.6 and 1.2 are investigated. Large-scale helical vortical structures are generated near the inlet of combustion chamber, and a lot of fine-scale vortices emerge downstream. Flame structure is engulfed by the vortical structures and depends largely on the swirl number. Spectral analysis of pressure oscillation on walls shows that quarter-wave mode of longitudinal acoustics has the largest energy, and that characteristic oscillations are found at higher frequencies. To investigate oscillation modes of pressure and heat release rate fields, dynamic mode decomposition (DMD) is applied to DNS results. It is shown that there are differences between dominant frequencies in spectral analysis of time-series pressure data at one point of walls and DMD of time-series pressure field data. DMD of pressure field reveals that the quarter-wave mode in longitudinal acoustics has the largest energy for the case of S = 0.6. Furthermore, it is clarified that the transverse acoustic plane waves and pressure oscillations induced by large-scale vortical motions play important roles for the pressure oscillations in combustors. DMD of heat release rate field reveals that the DMD modes of pressure with high amplitude do not necessarily have coupling with fluctuations of heat release rate. Interactions between dynamic modes of pressure and heat release rate are also discussed. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Web of Science ® 被引用回数 : 8

リンク情報
DOI
https://doi.org/10.1016/j.proci.2014.10.003
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000348049500084&DestApp=WOS_CPL
ID情報
  • DOI : 10.1016/j.proci.2014.10.003
  • ISSN : 1540-7489
  • eISSN : 1873-2704
  • Web of Science ID : WOS:000348049500084

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