On vortex–airfoil interaction noise including span-end effects, with application to open-rotor aeroacoustics

Roger, Michel; Schram, Christophe; Moreau, Stéphane

doi:10.1016/j.jsv.2013.09.012

Cited by 45 publications

(50 citation statements)

References 26 publications

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“…For frequencies lower than 27BP F , the noise radiation results mostly from the inner part of the blade where the pressure fluctuations have the same sign and phase along the span, resulting in classical dipolar-like patterns. This transition between quadripolar and dipolar directivity pattern is in good agreement with the model of Roger, Schram and Moreau [7]. Figure 25 shows the far-field directivities for the interaction with a Gaussian velocity deficit.…”

Section: Gaussian Deficitsupporting

confidence: 85%

“…Howe [4] compared qualitatively the modeled pressure signature with the experimental results of Schlinker and Amiet [1], and also discussed the additional trailing edge noise source due to the blade wake. Roger et al [6,7] and Quaglia et al [8,9] derived a new analytical model based on Amiet's theory [10]. They considered a translating flat plate, with an infinite or finite length, interacting with different vortex models including or not an axial velocity component.…”

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confidence: 99%

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Aeroacoustic Study of the Interaction of a Rotating Blade with a Batchelor Vortex

Zehner¹,

Falissard²,

Gloerfelt

2016

22nd AIAA/CEAS Aeroacoustics Conference

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The aeroacoustic response of the orthogonal interaction of a rotating blade with an isolated Batchelor vortex is studied by means of numerical simulation. The relative influence of the vortex tangential and axial velocity on the blade aerodynamics and on the acoustics radiated in the far-field is analyzed by comparing the interaction with a Batchelor vortex to the interactions considering the vortex tangential or axial velocity components. Analyses show that the vortex tangential velocity contributes mostly to the noise level at low frequencies, whereas the vortex axial velocity is responsible for the contribution at high frequencies. For the range of frequencies in between, the interaction noise results from constructive interferences of the noise radiated separately by each velocity component of the vortex.

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Section: Gaussian Deficitsupporting

confidence: 85%

mentioning

confidence: 99%

Aeroacoustic Study of the Interaction of a Rotating Blade with a Batchelor Vortex

Zehner¹,

Falissard²,

Gloerfelt

2016

22nd AIAA/CEAS Aeroacoustics Conference

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“…Analytical modeling of blade-tip/tip-vortex interaction is described in [14,15] using Amiet-Schwarzschild's approach [17]. The problem is considered in an unwrapped strip including the vortex and the impinged blade segment, in Cartesian coordinates.…”

Section: Orthogonal Blade/vortex Interaction Test Casementioning

confidence: 99%

“…It is assumed frozen during the interaction. Several key features of the sound produced by vortex impingement in a reference frame fixed to the blade segment were identified in [14,15]; they are listed below.…”

Section: Orthogonal Blade/vortex Interaction Test Casementioning

confidence: 99%

“…The latter are known to produce fast predictions that can be included at low cost in optimization algorithms but this benefit is at the price of drastic simplifications. Typically the impinged blade segment of the rear rotor must be assimilated to an equivalent rigid flat plate and the oncoming vortex split into two-dimensional gusts within the scope of a linearized strip-theory approach, in order that the problem remains tractable [14][15][16]. As a consequence key aspects of vortex dynamics are discarded from the analysis without any information about their role in the sound generation, such as vortex stretching caused by the blade thickness and camber at leading edge, for instance.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Analytical Investigation of Orthogonal Blade/Vortex Interaction Noise

Falissard¹,

Zehner²,

Roger

et al. 2015

21st AIAA/CEAS Aeroacoustics Conference

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Fast prediction methods used for preliminary design or in optimization algorithms often rely on linear analytical models based on drastic simplifications of the physical problem to be solved. To be used with a reasonable confidence level, these models must be validated over either experimental data or data coming from numerical simulations. In this context, this paper presents a cross-comparison of the aeroacoustic response of an orthogonal blade/vortex interaction computed using a high-order CFD solver and an acoustic analogy with an analytical model recently developed for this specific problem. The general framework is the acoustic prediction of Counter-Rotating Open Rotors in the preliminary design stages. This work follows two objectives. The first one is to improve the understanding of the phenomena occurring during such an interaction through the mean of CFD. The second one is to characterize the current limitations of the analytical modeling to make recommendations for their improvement.

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A Review of Turbomachinery Noise: From Analytical Models to High-Fidelity Simulations

Moreau

2020

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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On vortex–airfoil interaction noise including span-end effects, with application to open-rotor aeroacoustics

Cited by 45 publications

References 26 publications

Aeroacoustic Study of the Interaction of a Rotating Blade with a Batchelor Vortex

Aeroacoustic Study of the Interaction of a Rotating Blade with a Batchelor Vortex

Numerical and Analytical Investigation of Orthogonal Blade/Vortex Interaction Noise

A Review of Turbomachinery Noise: From Analytical Models to High-Fidelity Simulations

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