An aeroacoustic computer code will be developed capable of predicting the impedance of liners exposed to intense sound, high subsonic grazing flows and at high temperatures. This will provide an essential tool for the aircraft engine acoustic designers to understand how resonators behave in harsh engine environments. A three dimensional liner impedance model will be developed and mated to a flow duct sound propagation code to provide the designer of HVAC centrifugal and axial with the necessary tools to design highly efficient sound absorbing HVAC centrifugal and axial products. This technology is capable of being ported, for example, to manufacturers of space heaters and other products requiring quiet airflows.
An aeroacoustic computer code will be developed capable of predicting the impedance of liners exposed to intense sound, high subsonic grazing flows and at high temperatures. This will provide an essential tool for the aircraft engine acoustic designers to understand how resonators behave in harsh engine environments. A 3-D liner impedance model will be developed capable of determining the incident sound pressure far-field face-plate distances from resonator orifices. This represents an initial step in improving our understanding of how to effectively use the Dean Two-Microphone impedance measurement method. This is especially important because the Dean method is one of the current benchmark standards used to measure the effects of grazing flow and SPL on the impedance of cavity-backed liners.
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