Damping Eect of Perforated Plates on the Acoustics of Annular combustors

This paper aims at showing the inuence of perforated plates on the acoustic modes in aeronautical gas turbines combustion chambers. The analytical model developed by Howe 1 was implemented in a 3D acoustic Helmholtz solver to account for the eect of perforated plates. First, an analytic test case is used to validate the coding in the acoustic solver. Then, a computation of the acoustic modes in an actual industrial chamber is conducted, taking into account the perforated liners. Both longitudinal and azimuthal modes are studied.

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