An experimental investigation on the effect of in-flow distortions of propeller noise
An experimental investigation on the effect of in-flow distortions of propeller noise
Propellers usually operate in non-uniform flow conditions, leading to significant levels of noise generation due to interaction with the leading edges of the propeller blades. Under these flow conditions, the noise generated can be substantially different from the rotor-alone self-noise generated under uniform mean flow conditions. This paper presents an experimental investigation aimed at studying the far-field noise due to a two-bladed propeller immersed in a controlled non-uniform flow with known characteristics. This paper presents the results of a parametric study with different degrees of flow non-uniformity generated from different geometric obstructions located in the jet nozzle, while maintaining constant thrust. Measurements of the radiated noise show that the incoming mean flow non-uniformities under investigation in this study cause a significant increase in tonal amplitudes of the blade passing frequencies of harmonic orders greater than 2. At the first two blade passing frequencies the tones are dominated by the rotor-alone ‘Gutin-type’ tones resulting from the steady blade loading. The measured noise spectra are compared with predictions from a simple frequency-domain flat plate model. The analytical model will be shown to capture the main features of the interaction tonal noise spectrum and directivity.
Broadband noise, Interaction tones, Propeller noise, Tonal noise
Petricelli, Federico
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Chaitanya, Paruchuri
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Palleja-Cabre, Sergi
b841a96c-05d1-4f08-a197-8693cb3a3f90
Meloni, Stefano
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Joseph, Phillip F.
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Karimian, Amin
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Palani, Suresh
62cb4236-3b73-412f-9bee-8064a6e494c7
Camussi, Roberto
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20 October 2023
Petricelli, Federico
8698b4b1-23cd-4932-9d62-f04a65e314a4
Chaitanya, Paruchuri
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Palleja-Cabre, Sergi
b841a96c-05d1-4f08-a197-8693cb3a3f90
Meloni, Stefano
9c310e86-4f90-4f61-a649-0b11763f0674
Joseph, Phillip F.
9c30491e-8464-4c9a-8723-2abc62bdf75d
Karimian, Amin
8f2e1624-afff-4e07-b2cd-e780209608d7
Palani, Suresh
62cb4236-3b73-412f-9bee-8064a6e494c7
Camussi, Roberto
0da46d12-0aa9-4c11-9e06-a22ff80e79dc
Petricelli, Federico, Chaitanya, Paruchuri, Palleja-Cabre, Sergi, Meloni, Stefano, Joseph, Phillip F., Karimian, Amin, Palani, Suresh and Camussi, Roberto
(2023)
An experimental investigation on the effect of in-flow distortions of propeller noise.
Applied Acoustics, 214, [109682].
(doi:10.1016/j.apacoust.2023.109682).
Abstract
Propellers usually operate in non-uniform flow conditions, leading to significant levels of noise generation due to interaction with the leading edges of the propeller blades. Under these flow conditions, the noise generated can be substantially different from the rotor-alone self-noise generated under uniform mean flow conditions. This paper presents an experimental investigation aimed at studying the far-field noise due to a two-bladed propeller immersed in a controlled non-uniform flow with known characteristics. This paper presents the results of a parametric study with different degrees of flow non-uniformity generated from different geometric obstructions located in the jet nozzle, while maintaining constant thrust. Measurements of the radiated noise show that the incoming mean flow non-uniformities under investigation in this study cause a significant increase in tonal amplitudes of the blade passing frequencies of harmonic orders greater than 2. At the first two blade passing frequencies the tones are dominated by the rotor-alone ‘Gutin-type’ tones resulting from the steady blade loading. The measured noise spectra are compared with predictions from a simple frequency-domain flat plate model. The analytical model will be shown to capture the main features of the interaction tonal noise spectrum and directivity.
Text
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More information
Accepted/In Press date: 2 October 2023
e-pub ahead of print date: 20 October 2023
Published date: 20 October 2023
Additional Information:
Funding Information:
The authors would like to acknowledge the financial support of the Royal Academy of Engineering ( RF ).
Keywords:
Broadband noise, Interaction tones, Propeller noise, Tonal noise
Identifiers
Local EPrints ID: 483388
URI: http://eprints.soton.ac.uk/id/eprint/483388
ISSN: 0003-682X
PURE UUID: fe5f4862-6ac0-4242-9559-423c01447d36
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Date deposited: 30 Oct 2023 17:31
Last modified: 18 Mar 2024 04:04
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Contributors
Author:
Federico Petricelli
Author:
Stefano Meloni
Author:
Suresh Palani
Author:
Roberto Camussi
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