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The effect of wavy leading edges on aerofoil-gust interaction noise

The effect of wavy leading edges on aerofoil-gust interaction noise
The effect of wavy leading edges on aerofoil-gust interaction noise
High-order accurate numerical simulations are performed to investigate the effects of wavy leading edges (WLEs) on aerofoil–gust interaction (AGI) noise. The present study is based on periodic velocity disturbances predominantly in streamwise and vertical directions that are mainly responsible for the surface pressure fluctuation of an aerofoil. In general, the present results show that WLEs lead to reduced AGI noise. It is found that the ratio of the wavy leading-edge peak-to-peak amplitude (LEA) to the longitudinal wavelength of the incident gust (?g) is the most important factor for the reduction of AGI noise. It is observed that there exists a tendency that the reduction of AGI noise increases with LEA/?g and the noise reduction is significant for LEA/?g?0.3. The present results also suggest that any two different cases with the same LEA/?g lead to a strong similarity in their profiles of noise reduction relative to the straight leading-edge case. The wavelength of wavy leading edges (LEW), however, shows minor influence on the reduction of AGI noise under the present gust profiles used. Nevertheless, the present results show that a meaningful improvement in noise reduction may be achieved when 1.0?LEW/?g?1.5. In addition, it is found that the beneficial effects of WLEs are maintained for various flow incidence angles and aerofoil thicknesses. Also, the WLEs remain effective for gust profiles containing multiple frequency components. It is discovered in this paper that WLEs result in incoherent response time to the incident gust across the span, which results in a decreased level of surface pressure fluctuations, hence a reduced level of AGI noise.
0022-460X
6234-6253
Lau, A.S.H.
ae2aa86c-041b-4ea9-aaf3-60381ed355bf
Haeri, S.
8e2f9ded-d4c7-4ae3-9fdb-db91f5f9ba9e
Kim, J.W.
fedabfc6-312c-40fd-b0c1-7b4a3ca80987
Lau, A.S.H.
ae2aa86c-041b-4ea9-aaf3-60381ed355bf
Haeri, S.
8e2f9ded-d4c7-4ae3-9fdb-db91f5f9ba9e
Kim, J.W.
fedabfc6-312c-40fd-b0c1-7b4a3ca80987

Lau, A.S.H., Haeri, S. and Kim, J.W. (2013) The effect of wavy leading edges on aerofoil-gust interaction noise. Journal of Sound and Vibration, 332 (24), 6234-6253. (doi:10.1016/j.jsv.2013.06.031).

Record type: Article

Abstract

High-order accurate numerical simulations are performed to investigate the effects of wavy leading edges (WLEs) on aerofoil–gust interaction (AGI) noise. The present study is based on periodic velocity disturbances predominantly in streamwise and vertical directions that are mainly responsible for the surface pressure fluctuation of an aerofoil. In general, the present results show that WLEs lead to reduced AGI noise. It is found that the ratio of the wavy leading-edge peak-to-peak amplitude (LEA) to the longitudinal wavelength of the incident gust (?g) is the most important factor for the reduction of AGI noise. It is observed that there exists a tendency that the reduction of AGI noise increases with LEA/?g and the noise reduction is significant for LEA/?g?0.3. The present results also suggest that any two different cases with the same LEA/?g lead to a strong similarity in their profiles of noise reduction relative to the straight leading-edge case. The wavelength of wavy leading edges (LEW), however, shows minor influence on the reduction of AGI noise under the present gust profiles used. Nevertheless, the present results show that a meaningful improvement in noise reduction may be achieved when 1.0?LEW/?g?1.5. In addition, it is found that the beneficial effects of WLEs are maintained for various flow incidence angles and aerofoil thicknesses. Also, the WLEs remain effective for gust profiles containing multiple frequency components. It is discovered in this paper that WLEs result in incoherent response time to the incident gust across the span, which results in a decreased level of surface pressure fluctuations, hence a reduced level of AGI noise.

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e-pub ahead of print date: 17 August 2013
Published date: 25 November 2013
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 347783
URI: http://eprints.soton.ac.uk/id/eprint/347783
ISSN: 0022-460X
PURE UUID: 4555af0c-6654-44a9-9518-2fcdda75036c
ORCID for J.W. Kim: ORCID iD orcid.org/0000-0003-0476-2574

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Date deposited: 31 Jan 2013 11:41
Last modified: 26 Nov 2021 02:49

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Contributors

Author: A.S.H. Lau
Author: S. Haeri
Author: J.W. Kim ORCID iD

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