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Mechanisms of airfoil noise near stall conditions

Mechanisms of airfoil noise near stall conditions
Mechanisms of airfoil noise near stall conditions
The main focus of this paper is on investigating the noise produced by an aerofoil at high angles of attack over a range of Reynolds number 2x10^5-4x10^5. The objective is not modelling this source of noise but rather understanding the mechanisms of generation for surface pressure fluctuations, due to a separated boundary layer, that are then scattered by the trailing edge. To this aim, we use simultaneous noise and surface pressure measurement in addition to velocimetric measurements by means of Hot Wire Anemometry and Time-Resolved Particle Image Velocimetry. Three possible mechanisms for the so-called “separation-stall noise” have been identified in addition to a clear link between far field noise, surface pressure and velocity fields in the noise generation.
2469-990X
Lacagnina, Giovanni
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Paruchuri, Chaitanya
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Berk, Tim
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Joseph, Phillip
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Kim, Jung-Hoon
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Ganapathisubramani, Bharathram
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Hasheminejad, Seyed Mohammad
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Chong, Tze Pei
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Stalnov, Oksana
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Choi, Kwing-so
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Shahab, Muhammad Farrukh
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Omidyeganeh, Mohammad
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Pinelli, Alfredo
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Lacagnina, Giovanni
b6c548d0-38b3-4f0f-9f0a-9849cb910113
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Berk, Tim
6d080fa4-abf6-4a81-9e35-178e8454e755
Joseph, Phillip
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Kim, Jung-Hoon
8fe4d627-867c-48b8-b2ce-70d222d835c3
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Hasheminejad, Seyed Mohammad
1a06b1f4-ed86-4f0d-a55c-860f9111a454
Chong, Tze Pei
8d9b8213-687b-435d-8baf-b67e9f7055e7
Stalnov, Oksana
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Choi, Kwing-so
fbe04014-d917-40a2-b024-31dfbe416f4f
Shahab, Muhammad Farrukh
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Omidyeganeh, Mohammad
1e82d741-8aa4-4d5f-9b5a-003028ec2521
Pinelli, Alfredo
45bc982f-97a3-4bc2-a4f5-f1037c5aa239

Lacagnina, Giovanni, Paruchuri, Chaitanya, Berk, Tim, Joseph, Phillip, Kim, Jung-Hoon, Ganapathisubramani, Bharathram, Hasheminejad, Seyed Mohammad, Chong, Tze Pei, Stalnov, Oksana, Choi, Kwing-so, Shahab, Muhammad Farrukh, Omidyeganeh, Mohammad and Pinelli, Alfredo (2019) Mechanisms of airfoil noise near stall conditions. Physical Review Fluids, 4 (12), [123902]. (doi:10.1103/PhysRevFluids.4.123902).

Record type: Article

Abstract

The main focus of this paper is on investigating the noise produced by an aerofoil at high angles of attack over a range of Reynolds number 2x10^5-4x10^5. The objective is not modelling this source of noise but rather understanding the mechanisms of generation for surface pressure fluctuations, due to a separated boundary layer, that are then scattered by the trailing edge. To this aim, we use simultaneous noise and surface pressure measurement in addition to velocimetric measurements by means of Hot Wire Anemometry and Time-Resolved Particle Image Velocimetry. Three possible mechanisms for the so-called “separation-stall noise” have been identified in addition to a clear link between far field noise, surface pressure and velocity fields in the noise generation.

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Stall_noise_rev3 - Accepted Manuscript
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Accepted/In Press date: 23 October 2019
e-pub ahead of print date: 6 December 2019

Identifiers

Local EPrints ID: 435314
URI: http://eprints.soton.ac.uk/id/eprint/435314
ISSN: 2469-990X
PURE UUID: 194feabe-fbc9-42dd-bd47-510d20c05576
ORCID for Giovanni Lacagnina: ORCID iD orcid.org/0000-0002-8038-1127
ORCID for Bharathram Ganapathisubramani: ORCID iD orcid.org/0000-0001-9817-0486

Catalogue record

Date deposited: 30 Oct 2019 17:30
Last modified: 22 Nov 2021 02:59

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Contributors

Author: Giovanni Lacagnina ORCID iD
Author: Tim Berk
Author: Phillip Joseph
Author: Jung-Hoon Kim
Author: Seyed Mohammad Hasheminejad
Author: Tze Pei Chong
Author: Oksana Stalnov
Author: Kwing-so Choi
Author: Muhammad Farrukh Shahab
Author: Mohammad Omidyeganeh
Author: Alfredo Pinelli

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