On the reduction of aerofoil-turbulence interaction noise associated with wavy leading edges
On the reduction of aerofoil-turbulence interaction noise associated with wavy leading edges
An aerofoil leading-edge profile based on wavy (sinusoidal) protuberances/tubercles is investigated to understand the mechanisms by which they are able to reduce the noise produced through the interaction with turbulent mean flow. Numerical simulations are performed for non-lifting flat-plate aerofoils with straight and wavy leading edges (denoted by SLE and WLE, respectively) subjected to impinging turbulence that is synthetically generated in the upstream zone (free-stream Mach number of 0.24). Full three-dimensional Euler (inviscid) solutions are computed for this study thereby eliminating self-noise components. A high-order accurate finite-difference method and artefact-free boundary conditions are used in the current simulations. Various statistical analysis methods, including frequency spectra, are implemented to aid the understanding of the noise-reduction mechanisms. It is found with WLEs, unlike the SLE, that the surface pressure fluctuations along the leading edge exhibit a significant source-cutoff effect due to geometric obliqueness which leads to reduced levels of radiated sound pressure. It is also found that there exists a phase interference effect particularly prevalent between the peak and the hill centre of the WLE geometry, which contributes to the noise reduction in the mid- to high-frequency range.
526-552
Kim, J.W.
fedabfc6-312c-40fd-b0c1-7b4a3ca80987
Haeri, S.
8e2f9ded-d4c7-4ae3-9fdb-db91f5f9ba9e
Joseph, P.
9c30491e-8464-4c9a-8723-2abc62bdf75d
3 March 2016
Kim, J.W.
fedabfc6-312c-40fd-b0c1-7b4a3ca80987
Haeri, S.
8e2f9ded-d4c7-4ae3-9fdb-db91f5f9ba9e
Joseph, P.
9c30491e-8464-4c9a-8723-2abc62bdf75d
Kim, J.W., Haeri, S. and Joseph, P.
(2016)
On the reduction of aerofoil-turbulence interaction noise associated with wavy leading edges.
Journal of Fluid Mechanics, 792, .
(doi:10.1017/jfm.2016.95).
Abstract
An aerofoil leading-edge profile based on wavy (sinusoidal) protuberances/tubercles is investigated to understand the mechanisms by which they are able to reduce the noise produced through the interaction with turbulent mean flow. Numerical simulations are performed for non-lifting flat-plate aerofoils with straight and wavy leading edges (denoted by SLE and WLE, respectively) subjected to impinging turbulence that is synthetically generated in the upstream zone (free-stream Mach number of 0.24). Full three-dimensional Euler (inviscid) solutions are computed for this study thereby eliminating self-noise components. A high-order accurate finite-difference method and artefact-free boundary conditions are used in the current simulations. Various statistical analysis methods, including frequency spectra, are implemented to aid the understanding of the noise-reduction mechanisms. It is found with WLEs, unlike the SLE, that the surface pressure fluctuations along the leading edge exhibit a significant source-cutoff effect due to geometric obliqueness which leads to reduced levels of radiated sound pressure. It is also found that there exists a phase interference effect particularly prevalent between the peak and the hill centre of the WLE geometry, which contributes to the noise reduction in the mid- to high-frequency range.
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Accepted/In Press date: 1 February 2016
e-pub ahead of print date: 3 March 2016
Published date: 3 March 2016
Additional Information:
Data files are made available from http://dx.doi.org/10.5258/SOTON/397245 as required by EPSRC Research Data Policy.
Venue - Dates:
conference; 2016-02-01, 2016-02-01
Organisations:
Aerodynamics & Flight Mechanics Group
Identifiers
Local EPrints ID: 387135
URI: http://eprints.soton.ac.uk/id/eprint/387135
ISSN: 0022-1120
PURE UUID: ce9710a4-36d5-4f29-8a61-e772c47e0c9e
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Date deposited: 11 Feb 2016 10:18
Last modified: 15 Mar 2024 03:21
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S. Haeri
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