L.M.B.C. Campos, P.G.T.A. Serrao, J.L. Oliveira, M.H. Kobayashi

We discuss the propagation of sound in shear flows (§1), with particular emphasis on the critical layers where wave reflection or absorption can occur (§2). We start with a linear shear (§3), using a decomposition into even and odd solutions, as a simpler approach than those is the literature 7,10,11,12,16. We proceed to consider three "new" problems, not previously addressed in the literature: (§4) an exponential profile, corresponding to a boundary layer with suet ion, leading to a continuous spectrum; (§5) a parabolic shear, corresponding to a flow duct, with discrete spectrum; (§6) since all of the preceding cases concern shear flows of low Mach number, we also exhamine a linear shear flow with high-subsonic, transsonic or supersonic Mach number. We conclude with some remarks on the triggering of shear flow instabilities by sound waves (§7).

First Joint CEAS/AIAA Aeroacoustics Conference, München, 1995

Conference Paper

englisch

21,0 x 29,7 cm, 6 Seiten

DGLR-Bericht, 1995, 1995-01, First Joint CEAS/AIAA Aeroacoustics Conference - Proceedings; S.75-80; 1995; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1995