Jet noise: sound generation by disc and cylinder sources

Reference:

Carley, M. J. and Martin, P. A., 2012. Jet noise: sound generation by disc and cylinder sources. Proceedings of the Royal Society of London Series A - Mathematical Physical and Engineering Sciences, 468 (2148), pp. 3947-3964.

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Official URL:

http://dx.doi.org/10.1098/rspa.2012.0362

Abstract

An exact analysis of the field radiated by tonal and random non-axisymmetric sources distributed over a disc or cylinder is presented. The analysis is exact, without recourse to near- or far-field approximations, and leads to a direct relationship between source frequency and the nature of the radiated field. The implications of the analysis for a number of applications are discussed, finding in particular that source identification is inherently ill-conditioned as a result of a ‘filtering’ effect that removes information from the radiation field; low-frequency sources generate fields that are indistinguishable from each other; jet noise fields are inherently simpler than the flow that gives rise to them, a finding that has previously been noted for experimental data.

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