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Acoustics of turbulent flows: a report on Euromech 142

Published online by Cambridge University Press:  20 April 2006

M. Sunyach ,
D. Juvé  and
G. Comte-Bellot
M. Sunyach
Affiliation:
Laboratoire de Mécanique des Fluides, Associé au CNRS, Ecole Centrale de Lyon, 69130 Ecully, France
D. Juvé
Affiliation:
Laboratoire de Mécanique des Fluides, Associé au CNRS, Ecole Centrale de Lyon, 69130 Ecully, France
G. Comte-Bellot
Affiliation:
Laboratoire de Mécanique des Fluides, Associé au CNRS, Ecole Centrale de Lyon, 69130 Ecully, France
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Abstract

The European Mechanics Colloquium, Euromech 142, ww held at the Ecole Centrale de Lyon from 23 to 26 September 1981 and WM attended by 70 participants, from 9 countries, active in the fields of (i) sound production by turbulent flows and (ii) the effects of flow and turbulence on the propagation of acoustic waves. For topic (i), attention was mostly paid to shear-layer and jet instabilities and to the flow-surface interaction of flexible boundaries, vibrating blades and rigid thick airfoils. Applications were concerned in particular with propeller noise and airframe self-noise of large aircraft. Impinging shear layers were also considered for single and multiple cavities in which self-sustained oscillations can occur. Another subject discussed at the meeting was the noise from inhomogeneities, with applications to flames. For topic (ii), theoretical formulations were presented for the far field of moving multipole sources in the presence of flow and for sound propagation in ducts of variable cross section, with flow, for frequencies around the cut-off. The effect of turbulence was investigated in terms of the space–time coherence of the transmitted pressure fields. Broadband active sound control in the presence of flow was also considered, with emphasis on the progress made possible by use of digital filters. Finally, new experimental techniques, such as acoustic intensity measurements, were presented and large anechoic wind tunnels and other acoustic facilities were described.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 122 , September 1982 , pp. 511 - 530
Copyright
© 1982 Cambridge University Press

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