The effect of temperature on the acoustic performance of splitter silencers

Publication Type:
Conference Proceeding
42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life, 2013, 7 pp. 5826 - 5833
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In gas turbine exhaust systems dissipative silencers are normally used to attenuate broadband noise emanating from the turbine. These silencers often consist of parallel baffles packed with fibrous porous materials such as basalt wool. In gas turbine exhausts, temperatures can reach up to 700 °C and this can significantly affect silencer performance. Accordingly, the influence of elevated temperatures on silencer insertion loss is investigated here for one third octave bands up to a frequency of 8 kHz. Values for silencer insertion loss are generated using a theoretical model based on the finite element method and point collocation. Predictions draw on experimental data obtained for the bulk acoustic properties of basalt wool at temperatures of up to 500 °C. It is shown here that temperature significantly affects silencer performance and this effect should be compensated for when attempting to quantify silencer performance in high temperature applications.
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