27th Congress of International Council of the Aeronautical Sciences, 19 - 24 September 2010, Nice, France
Paper ICAS 2010-3.10.4

ON THE TRANSMISSION OF SOUND ACROSS A NON ISOTHERMAL BOUNDARY LAYER

L. M. B. C. Campos, M. H. Kobayashi*
IST, Portugal; *Univ. of Hawaii, USA

Keywords: aeroaccoustics, non-isothermal boundary-layer

Shear flows interact with sound causing acoustic attenuation or amplification. High speed shear flows are often anisothermal, with additional sound reffraction effects associated with the temperature gradients and non-uniform sound speed. These effects are demonstrated fin an anisothermal boundary layer for incident plane waves or a point sound source.

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