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Stéphane Moreau and Michel Roger
The present paper is aimed at providing an updated review of prediction methods for the aerodynamic noise of ducted rotor?stator stages. Indeed, ducted rotating-blade technologies are in continuous evolution and are increasingly used for aeronautical pro...
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Philipp Dietrich and Marc Schneider
In applications, the acoustics of fans can differ significantly from the measurements of the standalone fan. This is due to disturbed inflow conditions, for example, caused by a heat exchanger upstream of an axial fan. Resolving the complex geometry and ...
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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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Robert Valldosera Martinez, Frederico Afonso and Fernando Lau
In order to decrease the emitted airframe noise by a two-dimensional high-lift configuration during take-off and landing performance, a morphing airfoil has been designed through a shape design optimisation procedure starting from a baseline airfoil (NLR...
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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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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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Renzo Arina
The propagation of small perturbations in complex geometries can involve hydrodynamic-acoustic interactions, coupling acoustic waves and vortical modes. A propagation model, based on the linearized Navier?Stokes equations, is proposed. It includes the me...
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Bidur Khanal, Alistair Saddington and Kevin Knowles
This paper presents the development of a fourth-order finite difference computational aeroacoustics solver. The solver works with a structured multi-block grid domain strategy, and it has been parallelized efficiently by using an interface treatment base...
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Bidur Khanal, Alistair Saddington and Kevin Knowles
This paper presents the development of a fourth-order finite difference computational aeroacoustics solver. The solver works with a structured multi-block grid domain strategy, and it has been parallelized efficiently by using an interface treatment base...
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Bálint Lendvai, Tamás Benedek
Pág. 279 - 288
At moderate Reynolds numbers and angles of attack, the Laminar Boundary Layer (LBL) becomes unstable on the surface of airfoils, and causes periodic vortex shedding, which means undesired tonal peaks in the spectrum of the emitted aeroacoustic noise alon...
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Umberto Iemma
The advent, during the first decade of the 21st century, of the concept of acoustic metamaterial has disclosed an incredible potential of development for breakthrough technologies. Unfortunately, the extension of the same concepts to aeroacoustics has tu...
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Jinbin Fu, Yi Yuan and Luigi Vigevano
The accurate prediction of helicopter rotor aerodynamics and aeroacoustics using Computational Fluid Dynamics (CFD) techniques still remains a challenge, as the over-dissipation of numerical schemes results in a higher diffusive rate of rotor wake and vo...
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