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On rotor noise interference

Published online by Cambridge University Press:  23 June 2025

Tiziano Pagliaroli Open the ORCID record for Tiziano Pagliaroli [Opens in a new window] ,
Paolo Candeloro ,
Fabio Del Duchetto ,
Karl-Stéphane Rossignol  and
Jianping Yin
Tiziano Pagliaroli*
Affiliation:
Dipartimento di Ingegneria, Università Niccolò Cusano, Via Don Carlo Gnocchi, 00166 Rome, Italy
Paolo Candeloro
Affiliation:
Dipartimento di Ingegneria, Università Niccolò Cusano, Via Don Carlo Gnocchi, 00166 Rome, Italy
Fabio Del Duchetto
Affiliation:
Dipartimento di Ingegneria, Università Niccolò Cusano, Via Don Carlo Gnocchi, 00166 Rome, Italy
Karl-Stéphane Rossignol
Affiliation:
German Aerospace Center, Braunschweig 38108, Germany
Jianping Yin
Affiliation:
German Aerospace Center, Braunschweig 38108, Germany
*
Corresponding author: Tiziano Pagliaroli, tiziano.pagliaroli@unicusano.it
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Abstract

This study investigates noise generation from co-rotating rotors arranged in a side-by-side configuration. The analysis examines the effects of different phase delays and separation distances. A simple mathematical model is developed to provide insight into constructive and destructive noise interference. An experimental campaign was carried out to validate the proposed analytical model. Furthermore, the study introduces a space–time proper orthogonal decomposition technique to separate broadband and tonal components. Subsequently, wavelet analysis is applied to the tonal component, revealing a transition to chaos via intermittency, characterised by the local birth and decay of periodic oscillations. This phenomenon highlights the intricate and fascinating chaotic nature of interference transitions. The chaotic behaviour of the tonal component is related to the macro time scale of pressure fluctuations, and has been incorporated into the mathematical model. This model has several applications, including its potential use in the development of active control systems and the design of quieter distributed propulsion systems.

JFM classification

Acoustics: Aeroacoustics Acoustics: Noise control
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 1013 , 25 June 2025 , A43
Copyright
© The Author(s), 2025. Published by Cambridge University Press

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