Thermo-acoustic coupling in can-annular combustors: A numerical investigation

Federica Farisco, Lukasz Panek, Jim B.W. Kok, Jared Pent, Rajesh Rajaram

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

    2 Citations (Scopus)

    Abstract

    Thermo-acoustic instabilities in modern, high power density gas turbines need to be predicted and understood in order to avoid unexpected damage and engine failure. While the annular combustor design is expected to suffer from the occurrence of transverse waves and burner-to-burner acoustic interaction, the can-annular combustor design should be less vulnerable to transverse waves and acoustic burner-to-burner interaction, as the burners are acoustically coupled only by means of the turbine stator stage. Measurements in such machines, however, indicate that the pressure modes in neighboring cans synchronize and oscillate in or out of phase. This fact implies the existence of non-negligible cross-talk between neighboring cans. The objective of this work is to investigate the acoustic interaction between the cans, focusing on the turbine inlet section where the cans connect. The can-can transfer function of a realistic combustor system is computed. To reduce CPU time, simplified 2D equivalent systems are investigated. The simulations are carried out with compressible CFD solvers based on the OpenFOAM framework. Realistic boundary conditions for the flow and the acoustics are applied.

    Original languageEnglish
    Title of host publication22nd International Congress on Sound and Vibration, ICSV 2015
    PublisherInternational Institute of Acoustics and Vibrations
    ISBN (Electronic)9788888942483
    Publication statusPublished - 2015
    Event22nd International Congress on Sound and Vibration, ICSV 2015 - Florence, Italy
    Duration: 12 Jul 201516 Jul 2015

    Conference

    Conference22nd International Congress on Sound and Vibration, ICSV 2015
    CountryItaly
    CityFlorence
    Period12/07/1516/07/15

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