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Aerodynamic noise analysis of tilting rotor in edgewise flow conditions

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

Journal of Sound and Vibration, Volume: 582, Start page: 118423

Swansea University Author: Alper Celik Orcid Logo

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Abstract

This paper presents a comprehensive experimental analysis of the noise characteristics of an isolated tilt-rotor system under edgewise flight conditions. The investigation explores the effect of rotor tilt on noise and aerodynamics using flow velocity, thrust, and far-field noise measurements. Flow...

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Published in: Journal of Sound and Vibration
ISSN: 0022-460X
Published: Elsevier BV 2024
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa66074
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Abstract: This paper presents a comprehensive experimental analysis of the noise characteristics of an isolated tilt-rotor system under edgewise flight conditions. The investigation explores the effect of rotor tilt on noise and aerodynamics using flow velocity, thrust, and far-field noise measurements. Flow field results show that as the tilting angles vary, there is a change in speed over the rotor blade surface, which influences vortex formation and wake attributes. The far-field noise spectra revealed a significant decrease in sound pressure level with increasing tilt angle, predominantly evident in both the high-amplitude tonal peaks and the broadband signal within the low-to-mid frequency range. The directivity patterns of the overall sound pressure level also demonstrated a reduction in magnitude with the tilting of the rotor. This reduction was observed consistently across all top-plane observation points, with a monopole directivity trend. Meanwhile, in the side plane array, the decrease was primarily evident above the plane of rotation with a dipole directivity pattern. The radiation direction at which the minimum sound pressure level occurs was identified near the rotation plane, irrespective of the tilt angle. Furthermore, the time-dependent noise analyses revealed dominant and persistent signal characteristics at the blade passing frequency, whereas the mid-frequency range exhibited more intermittent behaviour, and the high-frequency range indicated transient characteristics.
Keywords: Rotor noise; Aeroacoustics; Tilt rotor; Wind tunnel experiment; Urban air mobility
College: Faculty of Science and Engineering
Funders: The first author would like to acknowledge the financial support of Majlis Amanah Rakyat Malaysia. The second author would like to acknowledge the EPSRC (Engineering and Physical Sciences Research Council) for post-doctoral sponsorship at the University of Bristol from June 2020 to December 2021 (Grant No. EP/S013024/1). All authors would like to acknowledge Horizon 2020 research and innovation programme under grant agreement number 882842 (SilentProp project).
Start Page: 118423