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Thursday, July 11 • 10:20 - 10:40
CONTROL EFFECTS OF PERFORATED LINERS ON THE COMBUSTION INSTABILITY IN AN ANNULAR COMBUSTOR

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Perforated liners with bias flow are efficient and robust in damping acoustic waves as well as cooling combustor walls in combustion systems. And many analytical models with the superiority of being physically clear and time-costless have been developed to describe the acoustic response of perforated liner with bias flow. Considering that the issue of perforated liners lined in both the inner and outer walls of the annular combustor is important. In this paper, we have applied transfer element method to describe the acoustics in the lined section that is influenced by both of the outer and inner perforated liners, and established the eigenvalue problem combined with appropriate matching and boundary conditions. It was found that the locations of the perforated liners are crucial to the control effect. In particular, when the homogeneous perforated liners nearly take up the whole length of the combustion chamber, the control effect is insignificant. This is mainly due to the fact that when the length of the perforated liner with backing cavity is equal to the combustion chamber, the mode shape in the backing cavity is similar to that in the combustion chamber at the longitudinal resonance frequency, leading to unconspicuous pressure fluctuation difference across the perforated plates that is responsible for the damping process. Moreover, we found that by splitting the perforated liner axially into two individual liners, the control effect was improved.

Moderators
MH

Maria Heckl

Professor, Keele University

Authors

Thursday July 11, 2019 10:20 - 10:40 EDT
Outremont 5

Attendees (4)