Abstract
A set of experiments were carried out within an aeroacoustic wind tunnel facility to investigate parametrically the acoustic interactions of a propeller positioned above two flat plates of varying dimensions. A propeller was tested at a constant rotational rate of 7000 RPM in static conditions in three test configurations; an isolated propeller, a propeller interacting with a semi-infinite flat plate and a propeller interacting with a finite flat plate. The aerodynamic loading and far-field noise data were collected. The changes in magnitude and directivity of the overall sound pressure level as well as the first blade passing frequency tone were explored comprehensively for the different cases. The spectral content of selected cases of interest were examined in greater detail showing the impacts of acoustic scattering, diffraction, reflection and shielding when both flat plates are introduced. The results show that locations exist at which there is significant potential for noise attenuation in both the tonal and broadband noise content. Reductions of up to 11.6 dB in the overall sound pressure level and 19.9 dB in the first blade passing frequency were discovered.
Original language | English |
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Title of host publication | 28th AIAA/CEAS Aeroacoustics Conference, 2022 |
Publisher | American Institute of Aeronautics and Astronautics Inc. (AIAA) |
Number of pages | 16 |
ISBN (Electronic) | 9781624106644 |
ISBN (Print) | 9781624106644 |
DOIs | |
Publication status | Published - 17 Jun 2022 |
Event | 28th AIAA/CEAS Aeroacoustics 2022 Conference - United Kingdom, Southampton, United Kingdom Duration: 14 Jun 2022 → 17 Jun 2022 https://doi.org/10.2514/6.2022-3095 |
Publication series
Name | AIAA/CEAS Aeroacoustics Conference |
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Publisher | AIAA |
ISSN (Print) | 1946-7826 |
Conference
Conference | 28th AIAA/CEAS Aeroacoustics 2022 Conference |
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Country/Territory | United Kingdom |
City | Southampton |
Period | 14/06/22 → 17/06/22 |
Internet address |
Bibliographical note
Funding Information:The first author would like to acknowledge the financial support of Embraer S.A and the EPSRC (Engineering and Physical Sciences Research Council). The authors would like to acknowledge Horizon 2020 research and innovation programme under grant agreement number 882842 (SilentProp project). The authors also thank Nur Syafiqah Jamaluddin who designed and built the propeller test rig.
Publisher Copyright:
© 2022, American Institute of Aeronautics and Astronautics Inc, AIAA., All rights reserved.
Keywords
- Propeller Noise
- Shielding
- Aeroacoustics
- Acoustic Scattering
- Noise Attenuation
- Acoustic Interaction
- Flat Plate