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Aerospace
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Propeller Noise
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Propeller Noise

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

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 3609

Special Issue Editors

Dr. Alessandro Di Marco

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Guest Editor
Department of Civil, Computer Science, and Aeronautical Technologies Engineering, Università Degli Studi Roma Tre, 00146 Rome, Italy
Interests: aerodynamics; aeronautics; aeroacoustics; fluid mechanics; aerospace; turbulence; rotor noise
Special Issues, Collections and Topics in MDPI journals
Dr. Elisa De Paola

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Guest Editor
Department of Civil, Computer Science and Aeronautical Technologies Engineering, Università Degli Studi Roma Tre, 00146 Rome, Italy
Interests: aerodynamics; aeronautics; aeroacoustics; fluid mechanics; aerospace; turbulence; rotor noise
Special Issues, Collections and Topics in MDPI journals
Dr. Caterina Poggi

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Guest Editor
Department of Civil, Computer Science, and Aeronautical Technologies Engineering, Università Degli Studi Roma Tre, 00146 Rome, Italy
Interests: aerodynamics; aeronautics; aeroacoustics; noise prediction; rotor noise; numerical formulations
Dr. Luana Georgiana Stoica

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Guest Editor
Department of Civil, Computer Science, and Aeronautical Technologies Engineering, Università Degli Studi Roma Tre, 00146 Rome, Italy
Interests: aerodynamics; aeronautics; aeroacoustics; fluid mechanics; aerospace; turbulence; rotor noise
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The growing interest in environmental issues related to the rapid growth of air and urban traffic has prompted institutions, the scientific community, and industries to devote significant efforts to reducing the impact of air transport systems. In this framework, electric propulsion has been recognized as one of the most promising approaches, inevitably bringing the investigation of propeller-driven systems back into focus. All this is in combination with the increasing development and use of remotely piloted systems (drones, UAVs), in which rotors are the main propulsion system as well as the primary noise source. Thus, the actual scenario requires innovative methods and approaches to design technological solutions for reducing aircraft noise, improving the rotor’s applicability, and better understanding the physical phenomena behind these systems. 

The aim of the current Special Issue is to present the latest developments and future trends in physical modeling, measurement technology, and numerical simulation, as well as the practical applications of propeller systems. It will include theoretical, experimental, and numerical contributions that describe original research results and/or innovative design concepts. Papers that address all aspects of the generation, propagation, and control of rotor noise, as well as the effect of noise on structures, are encouraged, including the application of aerospace noise suppression technologies.

Dr. Alessandro Di Marco
Dr. Elisa De Paola
Dr. Caterina Poggi
Dr. Luana Georgiana Stoica
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Aerospace is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • aeroacoustics
  • computational aeroacoustics (CAA)
  • propeller noise
  • tonal noise
  • broadband noise
  • numerical formulations
  • propeller WT test
  • noise reduction technologies

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Published Papers (2 papers)

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29 pages, 18357 KiB  
Article
Fluid-Dynamic and Aeroacoustic Characterization of Side-by-Side Rotor Interaction
by Ranieri Emanuele Nargi, Paolo Candeloro, Fabrizio De Gregorio, Giuseppe Ceglia and Tiziano Pagliaroli
Aerospace 2023, 10(10), 851; https://doi.org/10.3390/aerospace10100851 - 28 Sep 2023
Cited by 4 | Viewed by 1842
Abstract
An investigation of twin corotating rotors’ interaction effects was performed by load (thrust and torque) measurements, flow field dynamics through Time-Resolved Particle Image Velocimetry, and acoustic emissions using a microphone array. Two rotors, each with a diameter of D = 393.7 mm and [...] Read more.
An investigation of twin corotating rotors’ interaction effects was performed by load (thrust and torque) measurements, flow field dynamics through Time-Resolved Particle Image Velocimetry, and acoustic emissions using a microphone array. Two rotors, each with a diameter of D = 393.7 mm and equipped with three blades, were investigated in a side-by-side configuration, to simulate a multirotor propulsion system. The mutual distance between the propellers is 1.02 D, and four different rotating speeds, i.e., 2620, 3500, 4360, and 5200 RPM, were explored. In such a configuration, thrust and torque undergo a reduction compared to that found for a single propeller configuration. The level of aerodynamic load fluctuations increases as well. The interaction of the wakes produces a recirculation region at the external periphery of the shear layers. An innovative approach involving the coupling of Proper Orthogonal Decomposition (POD) and Wavelet Transform has been employed to investigate the dominant structures within the flow and their mutual influence. The results reveal that the interacting wakes are dominated by a wave-like motion pulsating at Harmonics of the Blade Passing Frequency (HBPF) of 1/3. Higher orders of POD modes capture coherent vortical structures, including tip vortices pulsating at HBPF = 1. The aeroacoustic investigation shows that the noise level, in terms of the Over All Sound Pressure Level, presents a remarkable increment concerning that generated by the single propeller. Full article
(This article belongs to the Special Issue Propeller Noise)
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14 pages, 9161 KiB  
Article
Experimental Investigation of Helicopter Noise While Approaching an Elevated Helipad
by Giuseppe Gibertini, Silvano Rezzonico, Marco Rossetti and Alex Zanotti
Aerospace 2023, 10(8), 701; https://doi.org/10.3390/aerospace10080701 - 9 Aug 2023
Viewed by 1301
Abstract
The present paper describes a test campaign performed to investigate the noise footprint emitted by a helicopter in an idealised urban context, reproducing the approach to an elevated helipad. The test campaign was performed in Politecnico di Milano’s anechoic chamber and was finalised [...] Read more.
The present paper describes a test campaign performed to investigate the noise footprint emitted by a helicopter in an idealised urban context, reproducing the approach to an elevated helipad. The test campaign was performed in Politecnico di Milano’s anechoic chamber and was finalised to investigate the effects produced only by helicopter noise. The set up consisted of a two-blade main rotor helicopter model and an aluminium rectangular prism model reproducing the landing building. Ground observer perceptions were recorded by means of a surface microphone and a realistic landing trajectory was approximated as a succession of fixed point measurements. Collected data were analysed through acoustic spectra and sound maps. Spectra were used to comprehend physical phenomena, such as reflection, diffraction and shielding, and to analyse the different contributions of helicopter noise. A sound map analysis enabled us to obtain a global perspective of the involved phenomena and to understand th extent to which people close to a building are stressed by a helicopter approaching an elevated urban helipad. Moreover, the experimental database, obtained over a free geometry, can be considered a useful tool for the validation of aeroacoustic solvers with different levels of fidelity. Full article
(This article belongs to the Special Issue Propeller Noise)
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