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Effects of number of blades on propeller noise

Kabilan Baskaran Orcid Logo, Nur Syafiqah Jamaluddin Orcid Logo, Alper Celik Orcid Logo, Djamel Rezgui Orcid Logo, Mahdi Azarpeyvand

Journal of Sound and Vibration, Volume: 572

Swansea University Author: Alper Celik Orcid Logo

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Abstract

This paper presents the effect of the number of blades on the aeroacoustic characteristics and aerodynamic performance of propellers utilized in urban air mobility vehicles through an extensive experimental study. A detailed parametric study is conducted for two, three, and five-bladed propellers. I...

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Published in: Journal of Sound and Vibration
ISSN: 0022-460X 1095-8568
Published: Elsevier BV 2024
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URI: https://cronfa.swan.ac.uk/Record/cronfa65054
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Abstract: This paper presents the effect of the number of blades on the aeroacoustic characteristics and aerodynamic performance of propellers utilized in urban air mobility vehicles through an extensive experimental study. A detailed parametric study is conducted for two, three, and five-bladed propellers. Investigations are carried out under static thrust conditions and incoming axial flow velocities for various rotational speeds. The spectra and directivity of the far-field noise are studied in detail for broadband and tonal components. Results show that two-bladed propellers produce higher tonal noise levels than other blade numbers for the same tip speed, while five-bladed propellers produce the highest broadband noise levels. The highest level of noise radiation is noted in the upstream and downstream directions for broadband noise, whereas tonal noise is radiated mainly in the plane of rotation. Results also indicate that high-frequency broadband humps are observed for higher advance ratios, likely caused by the formation of laminar separation bubbles, and that amplitude increases with blade numbers. The results of this study provide valuable insight for further investigations of propeller noise and aerodynamic performance.
Keywords: Propeller noise, Blade number, Urban air mobility, Solidity
College: Faculty of Science and Engineering
Funders: Horizon 2020 882842, EPSRC via Grant No. EP/S013024/1, Majlis Amanah Rakyat Malaysia