Acoustic field around a transonic cavity flow

Loupy, G.J.M., Barakos, G.N. and Kusyumov, A. (2017) Acoustic field around a transonic cavity flow. International Journal of Aeroacoustics, 16(6), pp. 507-535. (doi:10.1177/1475472X17730459)

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Abstract

This paper describes new techniques for analysing cavity flows. The beamforming method is used to estimate the pressure fluctuations inside a resonant transonic cavity, highlighting the localisation of the sources of noise. The method produces insightful results and only requires the use of an acoustic array and a mean flow-field. The technique models the noise propagation in a simple and efficient way, applicable for wind tunnel test. In addition, this paper discusses the generation of the cavity tones. Computational fluid dynamics results are analysed using a superposition of reflected acoustic waves driven by the cavity flow. This analysis shows that the time-averaged flow-field drives the frequencies of the tones, while the flow-field fluctuations drive their amplitude. In addition, the tonal dynamics of the cavity flow are represented by a simple model with standing wave oscillations and their modulation. This work is complementary to the well-established Rossiter cavity model.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Barakos, Professor George and Loupy, Gaƫtan
Authors: Loupy, G.J.M., Barakos, G.N., and Kusyumov, A.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:International Journal of Aeroacoustics
Publisher:SAGE
ISSN:1475-472X
ISSN (Online):2048-4003
Published Online:21 September 2017

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