Experimental Investigation and Numerical Prediction of Thermo-acoustic Instabilities and Associated Liner Vibrations Induced by Combustion Process in Gas Turbines

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)

Abstract

In this paper, lean premixed combustion on natural gas is studied in experimental and numerical way. Experiments are done at the state-of-the-art 500 kW thermal power combustion setup. The test rig resembles combustion chamber of gas turbine and can be pressurised up to 5 bar absolute pressure. The experimental study are applied for validation of numerical computations. For numerical calculations a hybrid approach combining CFD and FEM methods is used. Mutual interaction between acoustic wave propagation inside the combustion chamber and structural vibrations is studied applying acousto-elastic model. During the CFD computations, pressure fluctuations created by the flame in the combustion chamber, are calculated first. The results of the CFD are exported then to the FEM code, where interaction between acoustic waves and wall vibrations is resolved. To reduce the effect of numerical dispersion and dissipation of acoustic waves in the CFD code, only the pressure recorded near the flame region is transferred. To simulate acoustic waves next to the vibrating liner, the investigated model is equipped with acoustic elements designed to recognize a structure on one side and a fluid on the other side of the element. The frequencies at which thermo-acoustic instabilities may appear at given operational conditions are predicted. Furthermore, a modal analysis to mark the hazardous structural, acoustic and coupled modes and eigenfrequencies is performed. Computational results are validated against experimental data. Results are in good agreement.
Original languageEnglish
Title of host publication50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
Place of PublicationNashville, USA
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Pages-
Number of pages17
ISBN (Print)978-1-60086-936-5
DOIs
Publication statusPublished - 9 Jan 2012
Event50th AIAA Aerospace Sciences Meeting 2012 - Nashville, United States
Duration: 9 Jan 201211 Jan 2012
Conference number: 50

Publication series

Name
PublisherAIAA

Conference

Conference50th AIAA Aerospace Sciences Meeting 2012
CountryUnited States
CityNashville
Period9/01/1211/01/12

Keywords

  • METIS-288356
  • IR-81727

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  • Cite this

    Pozarlik, A. K., & Kok, J. B. W. (2012). Experimental Investigation and Numerical Prediction of Thermo-acoustic Instabilities and Associated Liner Vibrations Induced by Combustion Process in Gas Turbines. In 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition (pp. -). Nashville, USA: American Institute of Aeronautics and Astronautics Inc. (AIAA). https://doi.org/10.2514/6.2012-354