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Physical mechanisms and performance of slitted leading-edge profiles for the reduction of broadband aerofoil interaction noise

Physical mechanisms and performance of slitted leading-edge profiles for the reduction of broadband aerofoil interaction noise
Physical mechanisms and performance of slitted leading-edge profiles for the reduction of broadband aerofoil interaction noise
Aerofoil Turbulence Interaction (ATI) noise is an inviscid phenomenon generated by the impingement of turbulent flows onto the leading-edge of an aerofoil. This paper deals with a novel leading-edge serration geometry, composed of narrow slits, to reduce ATI noise. These profiles have been recently found to provide significantly better noise reductions than conventional leading edge geometries. A numerical and analytic investigation is performed into the mechanism and performance of its noise reduction. The far-field radiation is shown to be influenced by a system of induced vortices affecting the distribution of sources on the flat-plate and by destructive interference between the two sources generated at both ends of the slit. A simple two-source model is developed to predict the far-field noise reduction obtained and compared to straight leading-edge aerofoils.
0022-460X
1-17
Cannard, Marine
c0858ffc-6271-4a4f-930a-9117a6d543ce
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Turner, Jacob
8618df92-3b0c-46e6-a482-dd12b261d9a7
Kim, Jae
fedabfc6-312c-40fd-b0c1-7b4a3ca80987
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Cannard, Marine
c0858ffc-6271-4a4f-930a-9117a6d543ce
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Turner, Jacob
8618df92-3b0c-46e6-a482-dd12b261d9a7
Kim, Jae
fedabfc6-312c-40fd-b0c1-7b4a3ca80987
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d

Cannard, Marine, Joseph, Phillip, Turner, Jacob, Kim, Jae and Paruchuri, Chaitanya (2020) Physical mechanisms and performance of slitted leading-edge profiles for the reduction of broadband aerofoil interaction noise. Journal of Sound and Vibration, 473, 1-17, [115214]. (doi:10.1016/j.jsv.2020.115214).

Record type: Article

Abstract

Aerofoil Turbulence Interaction (ATI) noise is an inviscid phenomenon generated by the impingement of turbulent flows onto the leading-edge of an aerofoil. This paper deals with a novel leading-edge serration geometry, composed of narrow slits, to reduce ATI noise. These profiles have been recently found to provide significantly better noise reductions than conventional leading edge geometries. A numerical and analytic investigation is performed into the mechanism and performance of its noise reduction. The far-field radiation is shown to be influenced by a system of induced vortices affecting the distribution of sources on the flat-plate and by destructive interference between the two sources generated at both ends of the slit. A simple two-source model is developed to predict the far-field noise reduction obtained and compared to straight leading-edge aerofoils.

Text
JSV-D-19-01748R1 - Accepted Manuscript
Restricted to Repository staff only until 27 January 2022.
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More information

Accepted/In Press date: 27 January 2020
e-pub ahead of print date: 30 January 2020
Published date: 12 May 2020

Identifiers

Local EPrints ID: 438617
URI: http://eprints.soton.ac.uk/id/eprint/438617
ISSN: 0022-460X
PURE UUID: 6522df85-1430-472e-990b-2b256c631449
ORCID for Jacob Turner: ORCID iD orcid.org/0000-0002-0522-4340
ORCID for Jae Kim: ORCID iD orcid.org/0000-0003-0476-2574

Catalogue record

Date deposited: 18 Mar 2020 17:36
Last modified: 07 Oct 2020 02:21

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