Thermo-acoustic cross-talk between cans in a can-annular combustor

Federica Farisco*, Lukasz Panek, Jim B.W. Kok

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    17 Citations (Scopus)
    160 Downloads (Pure)

    Abstract

    Thermo-acoustic instabilities in gas turbine engines are studied to avoid engine failure. Compared to the engines with annular combustors, the can-annular combustor design should be less vulnerable to acoustic burner-to-burner interaction, since the burners are acoustically coupled only by the turbine stator stage and the plenum. However, non-negligible cross-talk between neighboring cans has been observed in measurements in such machines. This study is focused on the analysis of the acoustic interaction between the cans. Simplified two-dimensional (2D) and three-dimensional (3D) equivalent systems representing the corresponding engine alike turbine design are investigated. Thermo-acoustic instabilities are reproduced using a forced response approach. Compressible large eddy simulation based on the open source computational fluid dynamics OpenFOAM framework is used applying accurate boundary conditions for the flow and the acoustics. A study of the reflection coefficient and of the transfer function between the cans has been performed. Comparisons between 2D and 3D equivalent configurations have been evaluated.

    Original languageEnglish
    Pages (from-to)452-469
    Number of pages18
    JournalInternational journal of spray and combustion dynamics
    Volume9
    Issue number4
    DOIs
    Publication statusPublished - 1 Dec 2017

    Keywords

    • combustion instabilities
    • cross-talk
    • reflection coefficient
    • Thermo-acoustics
    • transmission coefficient

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