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Yong Wang, Kongcheng Zuo, Peng Guo, Kun Zhao and Victor Feliksovich Kopiev
Reducing the tonal noise from airfoil instabilities has attracted significant interest from the aeronautical community in the past few years. The aim of this paper is to investigate the effect of structured porous trailing edges on the tonal noise reduct...
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Gyuzel Yakhina, Michel Roger, Stéphane Moreau, Lap Nguyen and Vladimir Golubev
An experimental and analytical study of the tonal trailing-edge noise of a symmetric NACA-0012 aerofoil and of a cambered SD7003 aerofoil has been achieved. It provides a complete experimental database for both aerofoils and improves the understanding of...
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Stephen Schade, Robert Jaron, Lukas Klähn and Antoine Moreau
The rotor?stator interaction noise is a major source of fan noise. Especially for low-speed fan stages, the tonal component is typically a dominant noise source. A challenge is to reduce this tonal noise, as it is typically perceived as unpleasant. There...
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Victor Abbink, David Landes and M. Ercan Altinsoy
Tonal powertrain noise can have a strong negative impact on vehicle sound quality. Therefore, an assessment of the perceptibility of tonal noise with respect to masking noise is essential for the vehicle development process. In electric vehicles, due to ...
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Martin Ottersten, Hua-Dong Yao and Lars Davidson
In this study, three voluteless centrifugal fans are compared for their aeroacoustic performances. The tonal noise is predicted by coupling the IDDES with Formulation 1A of Farassat. The sources of the tonal noise at the blade passing frequency (BPF" rol...
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Michel Roger and Stéphane Moreau
The present work deals with the modeling of the aerodynamic sound generated by the propellers of small-size drones, taking into account the effects of horizontal forward flight with negative pitch and of installation on supporting struts. Analytical aero...
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Majd Daroukh, Stéphane Moreau, Nicolas Gourdain, Jean-François Boussuge and Claude Sensiau
New ultra high bypass ratio architectures may significantly affect the fan tonal noise of future aircraft engines. Indeed, such a noise source is supposed to be dominated by the interaction of fan-blade wakes with outlet guide vanes. However, shorter nac...
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Axel Holewa, Sergey Lesnik, Graham Ashcroft and Sébastien Guérin
The interaction of steady hot streaks from an annular ring of combustion chambers with turbine rotating blades can potentially generate tonal noise. The relevance of this source mechanism in aeroengine noise is controversially discussed in the literature...
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Majd Daroukh, Stéphane Moreau, Nicolas Gourdain, Jean-François Boussuge and Claude Sensiau
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Axel Holewa, Sergey Lesnik, Graham Ashcroft and Sébastien Guérin
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Chawki Abdessemed, Abdessalem Bouferrouk and Yufeng Yao
This work explores the aerodynamic and aeroacoustic responses of an airfoil fitted with a harmonically morphing Trailing Edge Flap (TEF). An unsteady parametrization method adapted for harmonic morphing is introduced, and then coupled with dynamic meshin...
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Stéphane Moreau
In future Ultra-High By-Pass Ratio turboengines, the turbomachinery noise (fan and turbine stages mainly) is expected to increase significantly. A review of analytical models and numerical methods to yield both tonal and broadband contributions of such n...
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Yan Sun, Yongjie Shi and Guohua Xu
The accurate prediction of helicopter rotor blade?vortex interaction (BVI) noise is challenging. This paper presents an implementation of the seventh-order improved weighted essentially non-oscillatory (WENO-Z) scheme for predicting rotor BVI noise using...
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Nikolaos M. Papadakis, Smaro Antoniadou and Georgios E. Stavroulakis
Typically, background noise of different types and levels is present during the measurement of the impulse response in spaces. The two methods that are, in practice, most frequently used in the measurement of the impulse response, are the exponential sin...
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Giuseppe Ciaburro, Gino Iannace and Amelia Trematerra
Small UAVs (unmanned aerial vehicle) can be used in many sectors such as the acquisition of images or the transport of objects. Small UAVs have also been used for terrorist activities or to disturb the flight of airplanes. Due to the small size and the p...
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Francisco Fernández-Zacarías, Juan Luis Beira-Jiménez, Virginia Puyana-Romero and Ricardo Hernández-Molina
The study aims to diagnose the sound pressure levels inside incubators in a controlled environment under free-field conditions. The tests were carried out in a semi-anechoic room under the standard UNE-EN ISO 3745:2012/A1:2018 in three different operatin...
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Pingzheng Li, Yanqun Wu, Wei Guo, Chunyan Cao, Yanxin Ma, Lifan Li, Hongze Leng, Aolong Zhou and Junqiang Song
Based on the interference spectrogram in the element?frequency domain using the data measured by the horizontal linear array, the source range can be estimated through the striation-based beamforming (SBF) method and its variants. Estimation of the stria...
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Joseph Watkins and Abdessalem Bouferrouk
This paper presents initial results on the aeroacoustic and aerodynamic effects of morphing the trailing-edge flap of the 30P30N aerofoil, over five flap deflections (5?25°), at an 8° angle of attack and a Reynolds number of Re=9.2×105" role="pr...
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Jia Li, Xu Dong, Dakun Sun, Yuqing Wang, Chunwang Geng and Xiaofeng Sun
Foam metal is a foam-like substance with a high porosity; it has been used in flow control, vibration abatement, and acoustic absorption, mainly based on its physical properties. The aim of the current paper is to investigate the effect of foam metal cas...
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Giorgio Palma, Lorenzo Burghignoli, Francesco Centracchio and Umberto Iemma
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...
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