AN EXPERIMENTAL INVESTIGATION OF COMBUSTION TURBINE EXHAUST STACK SILENCER PERFORMANCE

摘要

A combustion turbine exhaust stack has been developed as a test bed for measuring the in-situperformance of a parallel baffle type silencer. Loudspeaker testing has shown the ceramic fiber materialto provide improved low frequency attenuation over that of mineral wool, however it comes at theexpense of the high frequency attenuation.At operating temperatures, the apparent sound attenuation within the silencer’s gas passages was foundto be limited by the dynamic pressure, caused by turbulent flow, to about 15 to 30 dB. Additional dataprocessing and measurement techniques are being explored to extend the measurement range beyond theobserved 15 to 30 dB limit.