One-dimensional acoustic modeling of thermoacoustic instabilities (on cd)

J.F. van Kampen, R.A. Huls, Jacobus B.W. Kok, Theodorus H. van der Meer

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Abstract

In this paper the acoustic stability of a premixed turbulent natural gas flame confined in a combustor is investigated. Specifically when the flame is operated in a lean premixed mode, the thermoacoustic system is known to exhibit instabilities. These arise from a feedback mechanism between the oscillatory flow and heat release rate perturbations in the flame and often lead to large amplitude pressure and velocity perturbations in the combustor. The acoustics of the combustor are described with a one-dimensional transfer matrix method. The feedback mechanisms that can cause instabilities are included in this method. The (complex) frequency for which the determinant of the transfer matrix goes to zero indicates an instability. An important factor in the one-dimensional acoustic model is the transfer function between the oscillatory flow and heat release rate perturbations. This transfer function is obtained from a well-stirred reactor dynamic combustion model. Results show that the one-dimensional acoustic model in combination with a well-stirred reactor model is able to describe realistic gas turbine stability behaviour.
Original languageUndefined
Title of host publication10th International Congress on Sound and Vibration
EditorsA. Nilsson, H. Boden
Place of PublicationStockholm
PublisherKTH Royal Institute of Technology
Pages735-742
Number of pages8
ISBN (Print)0854327894
Publication statusPublished - 7 Jul 2003
Event10th International Congress on Sound and Vibration, ICSV 2003 - Stockholm, Sweden
Duration: 7 Jul 200310 Jul 2003
Conference number: 10

Publication series

Name
PublisherKTH

Conference

Conference10th International Congress on Sound and Vibration, ICSV 2003
Abbreviated titleICSV
CountrySweden
CityStockholm
Period7/07/0310/07/03

Keywords

  • METIS-216804
  • IR-58842

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