Airfoil Tip Leakage Aeroacoustics Predictions using a Lattice Boltzmann Based Method

Mann, Adrian; Kim, Minsuk; Wu, Jianmin; Pérot, Franck; Grilliat, Julien; Jacob, Marc C.; Colman, Miles

doi:10.2514/6.2016-2825

Cited by 12 publications

(7 citation statements)

References 29 publications

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“…To further detect the location of the noise sources in the near field, the dynamics of co-rotating flow structures was investigated [44]. The Flow-Induced Noise Detection (FIND) tool was used to detect and track the co-rotating flow structures in the flow field.…”

Section: Methodology and Solvermentioning

confidence: 99%

Benefits of curved serrations on broadband trailing-edge noise reduction

Avallone

Velden

Ragni

2017

Journal of Sound and Vibration

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Far-field noise and flow field over a novel curved trailing-edge serration (named as iron-shaped serration) are investigated. Spectra of the far-field broadband noise, directivity plots and the flow-field over the iron-shaped serration are obtained from numerical computations performed using a compressible Lattice-Boltzmann solver. The new design is compared to a conventional trailing-edge serration with a triangular geometry. Both serration geometries were retrofitted to a NACA 0018 airfoil at zero degree angle of attack. The iron-shaped geometry is found to reduce far-field broadband noise of approximately 2 dB more than the conventional sawtooth serration for chord-based Strouhal numbers St c < 15. At higher frequencies, the far-field broadband noise for the two serration geometries has comparable intensity. Near-wall velocity distribution and surface pressure fluctuations show that their intensity and spectra are independent on the serration geometry, but a function of the streamwise location. It is found that the larger noise reduction achieved by the iron-shaped trailing-edge serration is due to the mitigation of the scattered noise at the root. This effect is obtained by mitigating the interaction between the two sides of the serration, by delaying toward the tip both the outward (i.e., the tendency of the flow to deviate from the centerline to the edge of the serration) and the downward (i.e., the tendency of the flow to merge between the upper and bottom side of the serration) flow motions present at the root of the sawtooth.

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Section: Methodology and Solvermentioning

confidence: 99%

Benefits of curved serrations on broadband trailing-edge noise reduction

Avallone

Velden

Ragni

2017

Journal of Sound and Vibration

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“…An isolated fixed airfoil with a gap designed to study the tip clearance noise self noise is considered in this paper. ZLES [9], LES [10], and LBM [11] approaches were achieved on this configuration.…”

Section: Introductionmentioning

confidence: 99%

Numerical Prediction of the Aerodynamics and Acoustics of a Tip Leakage Flow Using Large-Eddy Simulation

Lamidel

Daviller

Roger

et al. 2021

IJTPP

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A Large-Eddy Simulation of the tip leakage flow of a single airfoil is carried out. The configuration consists of a non-rotating, isolated airfoil between two horizontal plates with a gap of 10 mm between the tip of the airfoil and the lower plate. The Mach number of the incoming flow is 0.2, and the Reynolds number based on the chord is 9.3 × 105. The objective of the present study is to investigate the best way to compute both the aerodynamics and acoustics of the tip leakage flow. In particular, the importance of the inflow conditions on the prediction of the tip leakage vortex and the airfoil loading is underlined. On the other hand, the complex structure of the tip leakage vortex and its convection along the airfoil was recovered due to the use of a mesh adaptation based on the dissipation of the kinetic energy. Finally, the ability of the wall law to model the flow in the tip leakage flow region was proven in terms of wall pressure fluctuations and acoustics in the far-field.

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“…34 More precisely, the dynamics of the vortical structures can be modeled as a distribution of co-rotating pairs of vortex filaments of length ∆l, separated by a distance 2z, undergoing a rotational motion with angular velocity Ω. Following, 35 the total radiated power, emitted by a pair of co-rotating vortices can be estimated as:…”

Section: Computational Methodologymentioning

confidence: 99%

Numerical study on combed teeth serrations for wind turbine noise reduction

Velden

Oerlemans

2017

23rd AIAA/CEAS Aeroacoustics Conference

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This study investigates the flow topology and noise emission from a wind turbine airfoil with combed serration trailing edge geometry, to understand the noise reduction observed in earlier experiments. A comparison is made to a straight trailing edge and a serrated trailing edge without combs. The different trailing edges are retrofitted to a cambered airfoil at design angle of attack. The flow field is analyzed by evaluating the fully explicit, transient, compressible Lattice Boltzmann equation. The acoustic far field is obtained by means of the Ffowcs-Williams and Hawkings integral solution, Curle's integral solution, and a direct probe solution. The simulated mean pressure distribution matches earlier wind tunnel experiments (obtained from the Virginia Tech anechoic facility) well. Furthermore, the numerical results confirm that the combed serrations give a larger noise reduction than the standard serration. Both trailing edge geometries show similar acoustic trends as the experiments, giving confidence in the numerical results.

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Airfoil Tip Leakage Aeroacoustics Predictions using a Lattice Boltzmann Based Method

Cited by 12 publications

References 29 publications

Benefits of curved serrations on broadband trailing-edge noise reduction

Benefits of curved serrations on broadband trailing-edge noise reduction

Numerical Prediction of the Aerodynamics and Acoustics of a Tip Leakage Flow Using Large-Eddy Simulation

Numerical study on combed teeth serrations for wind turbine noise reduction

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