Combustion oscillation of a self-excited thermoacoustic phenomenon occurs inside the gas turbine combustor. In general, excessive pressure fluctuation of combustion oscillation may severely impair the gas turbine engine operation and can result in hardware damages. Therefore, combustion oscillation has been one of the problems of the gas turbine development. Acoustic liner of an additional acoustic damping device is developed and described to suppress the combustion oscillation in this paper. Acoustic liner consists of a perforated plate and back cavity. The acoustic property of perforated plate has been well researched. These helpful reports are referred in this paper as well. The results of the model tests and the actual engine in actual operations tests show that acoustic liner can suppress combustion oscillation at high frequencies. This suppression method can be designed without detailed combustion prediction, thus the accurate design seems to be relatively easy. As the results of the actual engine tests in this paper, the gas turbine combustor with acoustic liner can be operating robustly without worrying about high frequency oscillation, and the contribution to the combustor development of the future can be expected.
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