Effects of mean flow and temperature on acoustic liner performance in dual stream flow ducts

This paper investigates effects of mean flow and temperature on acoustic liner performance in dual stream flow ducts using solutions from a linearized Euler solver, which are verified with and an approximate eigenmode/mode matching technique. A simple, uniform, long cowl duct configuration with partial liner treatment on the outer wall exposed to the cold stream is studied in the present investigation. While the linearized Euler solver uses a Reynolds-Averaged Navier-Stokes solution as the mean flow, the eigenmode approach assumes uniform plug flow for the cold and hot streams separated by a vortex sheet. Results are obtained for incident modes from the core duct by both methods and compared. Results indicate that the liner effectiveness is a strong function of the mode cut-on ratio as well as the refraction mechanisms of the mean flow. This type of liner configuration could therefore provide effective noise suppression over a useful range of mode orders generated within the core. Copyright © 2009 by Y. Ozyoruk and B.J. Tester.
15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference)


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Citation Formats
Y. Özyörük, “Effects of mean flow and temperature on acoustic liner performance in dual stream flow ducts,” Miami, USA, 2009, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=78149462194&origin=inward.