The attenuation of sound energy propagating through a turbine is analyzed using an actuator disk theory. The analysis is restricted to low frequency disturbances and subsonic relative flow. Mach number changes and flow turning across a stage element are taken into account. Results indicate that the attenuation of acoustic energy across a typical turbine stage is at least 10 dB.
Attenuation of Acoustic Energy Across a Turbine Stage With Subsonic Relative Flow
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Bekofske, K. "Attenuation of Acoustic Energy Across a Turbine Stage With Subsonic Relative Flow." Proceedings of the ASME 1975 International Gas Turbine Conference and Products Show. Volume 1A: General. Houston, Texas, USA. March 2–6, 1975. V01AT01A016. ASME. https://doi.org/10.1115/75-GT-17
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