Aeroacoustic Analysis

A special issue of Aerospace (ISSN 2226-4310). This special issue belongs to the section "Aeronautics".

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 2966

Special Issue Editor


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Guest Editor
Department of Mechanical Engineering, University of Bath, Bath BA2 7AY, UK
Interests: acoustics; aeroacoustics; boundary element method; numerical methods

Special Issue Information

Dear Colleagues,

As the need to move away from combustion-powered transport becomes more urgent, a shift in the focus of aeroacoustics research becomes necessary. Historically, the aim of aeroacoustic research has been to reduce noise to a level comparable with the background noise in the environment, functionally equivalent to making systems “silent.” With the introduction of electric surface transport, the reduction in environmental background noise will make this aim much more stringent and unlikely to be achievable by incremental improvement of existing technologies. Furthermore, the changes in aircraft propulsion and operation which will be needed in order to meet new regulatory and environmental requirements will lead to new challenges in noise control and reduction.

This Special Issue of Aerospace will present the state of the art of aeroacoustic analysis at a turning point in the discipline. Papers covering the full range of noise prediction, measurement, control, analysis, and reduction are invited. In particular, work which offers the potential for non-incremental improvement in capabilities, necessary for the reduction of noise at source, and for the control of noise in the environment, is welcomed. This could include novel passive and active control concepts, such as metamaterials, advanced prediction methods for source and propagation modelling, and new concepts for aircraft configurations and operation.

Dr. Michael Carley
Guest Editor

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Published Papers (1 paper)

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Research

10 pages, 1059 KiB  
Article
Innovative Acoustic Treatments of Nacelle Intakes Based on Optimised Metamaterials
by Giorgio Palma, Lorenzo Burghignoli, Francesco Centracchio and Umberto Iemma
Aerospace 2021, 8(10), 296; https://doi.org/10.3390/aerospace8100296 - 14 Oct 2021
Cited by 8 | Viewed by 2272
Abstract
Modern turbofans with high bypass ratios, low blade passage frequencies and short nacelles require continuous development of acoustic linings to achieve the noise reductions expected by the international aviation authorities. Metamaterials and metafluids have been recently proposed as promising technologies for designing innovative [...] Read more.
Modern turbofans with high bypass ratios, low blade passage frequencies and short nacelles require continuous development of acoustic linings to achieve the noise reductions expected by the international aviation authorities. Metamaterials and metafluids have been recently proposed as promising technologies for designing innovative acoustic treatments dedicated to reducing aeronautic turbofan noise emissions. In this work, a phase-gradient metasurface treatment is investigated as a way to tackle the noise radiation from an axially symmetric nacelle. This paper aims to study the potential benefits of the mentioned technology, and is not an attempt to design a complete new liner or nacelle. The metasurface is modelled through an equivalent metafluid, and a simulation-based optimisation is used in defining the design parameters. The tonal contribution of the blade passage frequency is considered, and the numerical results with the metafluid optimised on one azimuthal mode at a time show a significant effect in terms of acoustic levels and directivity over an arc of virtual receivers. Full article
(This article belongs to the Special Issue Aeroacoustic Analysis)
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