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Leading edge serrations for the reduction of aerofoil self-noise at low angle of attack, pre-stall and post-stall conditions

Leading edge serrations for the reduction of aerofoil self-noise at low angle of attack, pre-stall and post-stall conditions
Leading edge serrations for the reduction of aerofoil self-noise at low angle of attack, pre-stall and post-stall conditions
This paper addresses the usefulness of leading edge serrations for reducing
aerofoil self-noise over a wide range of angles of attack. Different serration
geometries are studied over a range of Reynolds number (Re =2e5-4e5).
Design guidelines are proposed that permit noise reductions over most angles
of attack. It is shown that serration geometries reduces the noise but adversely
effect the aerodynamic performance suggesting that a trade-off should be sought
between these two considerations. The self-noise performance of leading edge
serrations has been shown to fall into three angle of attack (AoA) regimes: low
angles where the flow is mostly attached, moderate angles where the flow is
partially to fully separated, and high angles of attack where the flow is fully
separated. Leading edge serrations have been demonstrated to be effective in
reducing noise at low and high angles of attack but ineffective at moderate angles.
The noise reduction mechanisms are explored in each of three angle regimes.
1475-472X
Lacagnina, Giovanni
b6c548d0-38b3-4f0f-9f0a-9849cb910113
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Kim, Jung-Hoon
8fe4d627-867c-48b8-b2ce-70d222d835c3
Berk, Tim
6d080fa4-abf6-4a81-9e35-178e8454e755
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Choi, Kwing-So
fbe04014-d917-40a2-b024-31dfbe416f4f
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Hasheminejad, Seyed Mohammad
df18e919-7ad3-431b-8d25-82949e839ac5
Chong, Tze Pei
8d9b8213-687b-435d-8baf-b67e9f7055e7
Stalnov, Oksana
6ca7508b-4d32-4e46-9158-ef8f03795ece
Shahab, Muhammad Farrukh
89fb5542-908a-4211-abdf-e695c0928950
Omidyeganeh, Mohammad
1e82d741-8aa4-4d5f-9b5a-003028ec2521
Pinelli, Alfredo
45bc982f-97a3-4bc2-a4f5-f1037c5aa239
Lacagnina, Giovanni
b6c548d0-38b3-4f0f-9f0a-9849cb910113
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Kim, Jung-Hoon
8fe4d627-867c-48b8-b2ce-70d222d835c3
Berk, Tim
6d080fa4-abf6-4a81-9e35-178e8454e755
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Choi, Kwing-So
fbe04014-d917-40a2-b024-31dfbe416f4f
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Hasheminejad, Seyed Mohammad
df18e919-7ad3-431b-8d25-82949e839ac5
Chong, Tze Pei
8d9b8213-687b-435d-8baf-b67e9f7055e7
Stalnov, Oksana
6ca7508b-4d32-4e46-9158-ef8f03795ece
Shahab, Muhammad Farrukh
89fb5542-908a-4211-abdf-e695c0928950
Omidyeganeh, Mohammad
1e82d741-8aa4-4d5f-9b5a-003028ec2521
Pinelli, Alfredo
45bc982f-97a3-4bc2-a4f5-f1037c5aa239

Lacagnina, Giovanni, Paruchuri, Chaitanya, Kim, Jung-Hoon, Berk, Tim, Joseph, Phillip, Choi, Kwing-So, Ganapathisubramani, Bharathram, Hasheminejad, Seyed Mohammad, Chong, Tze Pei, Stalnov, Oksana, Shahab, Muhammad Farrukh, Omidyeganeh, Mohammad and Pinelli, Alfredo (2020) Leading edge serrations for the reduction of aerofoil self-noise at low angle of attack, pre-stall and post-stall conditions. International Journal of Aeroacoustics. (doi:10.1177/ToBeAssigned). (In Press)

Record type: Article

Abstract

This paper addresses the usefulness of leading edge serrations for reducing
aerofoil self-noise over a wide range of angles of attack. Different serration
geometries are studied over a range of Reynolds number (Re =2e5-4e5).
Design guidelines are proposed that permit noise reductions over most angles
of attack. It is shown that serration geometries reduces the noise but adversely
effect the aerodynamic performance suggesting that a trade-off should be sought
between these two considerations. The self-noise performance of leading edge
serrations has been shown to fall into three angle of attack (AoA) regimes: low
angles where the flow is mostly attached, moderate angles where the flow is
partially to fully separated, and high angles of attack where the flow is fully
separated. Leading edge serrations have been demonstrated to be effective in
reducing noise at low and high angles of attack but ineffective at moderate angles.
The noise reduction mechanisms are explored in each of three angle regimes.

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Accepted/In Press date: 31 May 2020

Identifiers

Local EPrints ID: 441261
URI: http://eprints.soton.ac.uk/id/eprint/441261
ISSN: 1475-472X
PURE UUID: e3edbf51-3960-4b94-86d6-5b644a573a04
ORCID for Giovanni Lacagnina: ORCID iD orcid.org/0000-0002-8038-1127
ORCID for Bharathram Ganapathisubramani: ORCID iD orcid.org/0000-0001-9817-0486

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Date deposited: 08 Jun 2020 16:30
Last modified: 18 Feb 2021 17:30

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