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Aerofoil surface pressure reconstruction from far-field array measurements

Aerofoil surface pressure reconstruction from far-field array measurements
Aerofoil surface pressure reconstruction from far-field array measurements

This paper covers the relationship between the far-field sound radiation of an aerofoil interacting with a turbulent flow and the Spatial Fourier Transform of the dipole source strength distribution over the aerofoil surface. It is shown that each far-field microphone effectively samples the source wavenumber spectrum at a particular wavenumber associated with the observer position and the Mach number; these wavenumbers are inside the “acoustic domain” in the wavenumber space and correspond to propagating plane waves, while wavenumbers outside this domain correspond to evanescent waves and are not visible in the far-field. We briefly discuss the surface pressure properties of a flat plate aerofoil, where the flat plate response functions for supercritical and subcritical gusts are interpreted from a wavenumber-domain perspective and some examples of aerofoil surface pressure wavenumber power spectra are shown. We then propose a source estimation method from far-field measurements in a convected medium: this is based on the Inverse Spatial Fourier Transform of the sampled source wavenumber spectrum within the “acoustic domain”. Wavenumbers outside this domain are not recoverable from far-field observations; hence, the estimated source distribution contains only components that are efficient radiators of far-field sound, but is spatially bandlimited.

American Institute of Aeronautics and Astronautics
Casagrande Hirono, Fabio
ef8c2e33-96ec-467b-874d-74f0f9bb5f09
Joseph, Phillip F.
9c30491e-8464-4c9a-8723-2abc62bdf75d
Fazi, Filippo Maria
e5aefc08-ab45-47c1-ad69-c3f12d07d807
Casagrande Hirono, Fabio
ef8c2e33-96ec-467b-874d-74f0f9bb5f09
Joseph, Phillip F.
9c30491e-8464-4c9a-8723-2abc62bdf75d
Fazi, Filippo Maria
e5aefc08-ab45-47c1-ad69-c3f12d07d807

Casagrande Hirono, Fabio, Joseph, Phillip F. and Fazi, Filippo Maria (2018) Aerofoil surface pressure reconstruction from far-field array measurements. In 2018 AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics.. (doi:10.2514/6.2018-3435).

Record type: Conference or Workshop Item (Paper)

Abstract

This paper covers the relationship between the far-field sound radiation of an aerofoil interacting with a turbulent flow and the Spatial Fourier Transform of the dipole source strength distribution over the aerofoil surface. It is shown that each far-field microphone effectively samples the source wavenumber spectrum at a particular wavenumber associated with the observer position and the Mach number; these wavenumbers are inside the “acoustic domain” in the wavenumber space and correspond to propagating plane waves, while wavenumbers outside this domain correspond to evanescent waves and are not visible in the far-field. We briefly discuss the surface pressure properties of a flat plate aerofoil, where the flat plate response functions for supercritical and subcritical gusts are interpreted from a wavenumber-domain perspective and some examples of aerofoil surface pressure wavenumber power spectra are shown. We then propose a source estimation method from far-field measurements in a convected medium: this is based on the Inverse Spatial Fourier Transform of the sampled source wavenumber spectrum within the “acoustic domain”. Wavenumbers outside this domain are not recoverable from far-field observations; hence, the estimated source distribution contains only components that are efficient radiators of far-field sound, but is spatially bandlimited.

Full text not available from this repository.

More information

e-pub ahead of print date: 24 June 2018
Published date: 25 June 2018
Venue - Dates: AIAA/CEAS Aeroacoustics Conference, 2018, , Atlanta, United States, 2018-06-25 - 2018-06-29

Identifiers

Local EPrints ID: 424584
URI: http://eprints.soton.ac.uk/id/eprint/424584
PURE UUID: 9b020ba8-ef50-4f98-a626-c4c069be1eba
ORCID for Fabio Casagrande Hirono: ORCID iD orcid.org/0000-0003-4167-6720

Catalogue record

Date deposited: 05 Oct 2018 11:38
Last modified: 27 Nov 2020 17:32

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