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Amplification of aerodynamic noise by convected flow inhomogeneities

โœ Scribed by C.L. Morfey

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
373 KB
Volume
31
Category
Article
ISSN
0022-460X

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โœฆ Synopsis

Lighthill's acoustic analogy is used to study the sound radiated from free flows without dissipation, in the limit as the sound speed tends to infinity. If the flow is of non-uniform density, the most efficient source is not the velocity quadrupole term discussed by Lighthill, but a dipole-order term whose radiated intensity scales on the sixth power of velocity. The physical mechanism is the same as that described by Rayleigh in his work on sound scattering.

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