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HIGH-WAVENUMBER ACOUSTIC RADIATION FROM A THIN-WALLED SCARFED CYLINDER

✍ Scribed by G.M. KEITH; N. PEAKE

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 490 KB
Volume: 255
Category: Article
ISSN: 0022-460X
DOI: 10.1006/jsvi.2001.4145

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✦ Synopsis

The analysis of the radiation from an axisymmetric duct using the Geometrical Theory of Di!raction and uniform asymptotics, presented in a companion paper, is extended to an asymmetric, scarfed cylinder. The generic theory from the application to axisymmetric cylinders is brie#y recapitulated and the geometrical calculations necessary for the analysis of the scarfed cylinder are presented in detail. The scarfed cylinder is used as a model for a novel technique of noise reduction in modern aeroengines in which the intake is directed a little upward to try and direct noise radiation away from the ground. We do not carry out a full parameter study, but preliminary results from this work suggest the technique has signi"cant potential noise reduction bene"ts.

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✍ G.M. KEITH; N. PEAKE 📂 Article 📅 2002 🏛 Elsevier Science 🌐 English ⚖ 275 KB

The radiation from an axisymmetric thin-walled cylinder is determined by using the Geometrical Theory of Di!raction. The non-uniformities associated with this theory are corrected by using uniform asymptotic techniques, and the far"eld velocity potential is calculated everywhere. The theory provides