Aerodynamic noise prediction for a wind turbine using numerical flow simulations and semi-empirical modelling approaches

Wind energy expansion is worldwide followed by various limitations, i.e. land availability, the NIMBY (not in my backyard) attitude, interference on birds migration routes and so on. This undeniable expansion is pushing wind farms near populated areas throughout the years, where noise regulation is more stringent. That demands solutions for the wind turbine (WT) industry, in order to produce quieter WT units. Focusing in the subject of airfoil noise prediction, it can help the assessment and design of quieter wind turbine blades. Considering the airfoil noise as a composition of many sound sources, and in light of the fact that the main noise production mechanisms are the airfoil self-noise and the turbulent inflow (TI) noise, this work is concentrated on the latter. TI noise is classified as an interaction noise, produced by the turbulent inflow, incident on the airfoil leading edge (LE). Theoretical and semi-empirical methods for the TI noise prediction are already available, based on Amiet’s broadband noise theory. Analysis of many TI noise prediction methods is provided by this work in the literature review, as well as the turbulence energy spectrum modeling. This is then followed by comparison of the most reliable TI noise methodologies, qualitatively and quantitatively, with the error estimation, compared to the Ffowcs Williams-Hawkings solution for computational aeroacoustics. Basis for integration of airfoil inflow noise prediction into a wind turbine noise prediction code is the final goal of this work.

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Aerodynamic Noise Characterization of a Full-Scale Wind Turbine through High-Frequency Surface Pressure Measurements

International Journal of Aeroacoustics ◽

10.1260/1475-472x.14.5-6.729 ◽

2015 ◽

Vol 14 (5-6) ◽

pp. 729-766 ◽

Cited By ~ 8

Author(s):

Franck Bertagnolio ◽

Helge Aa. Madsen ◽

Christian Bak ◽

Niels Troldborg ◽

Andreas Fischer

Keyword(s):

Wind Turbine ◽

Surface Pressure ◽

High Frequency ◽

Full Scale ◽

Aerodynamic Noise ◽

Pressure Measurements ◽

Noise Characterization

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Experimental validation of a wind turbine turbulent inflow noise prediction code

22nd AIAA/CEAS Aeroacoustics Conference ◽

10.2514/6.2016-2953 ◽

2016 ◽

Cited By ~ 2

Author(s):

Steven Buck ◽

Stefan Oerlemans ◽

Scott Palo

Keyword(s):

Wind Turbine ◽

Experimental Validation ◽

Noise Prediction ◽

Turbulent Inflow

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Mechanical and Aerodynamic Noise Prediction for Electric Vehicle Traction Motor and Its Validation

10.4271/2017-26-0270 ◽

2017 ◽

Cited By ~ 2

Author(s):

Rahul Gurav ◽

Kishor D Udawant ◽

Ramkumar Rajamanickam ◽

N V Karanth ◽

S R Marathe

Keyword(s):

Electric Vehicle ◽

Aerodynamic Noise ◽

Noise Prediction ◽

Traction Motor

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Near-Wake Flow Simulations for a Mid-Sized Rim Driven Wind Turbine

10.2514/6.2013-2419 ◽

2013 ◽

Author(s):

Bryan Kaiser ◽

Svetlana Poroseva ◽

Erick L. Johnson ◽

Rob Hovsapian

Keyword(s):

Wind Turbine ◽

Wake Flow ◽

Near Wake ◽

Flow Simulations

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Progress in semi-empirical modelling of main-sequence stellar chromospheres

Symposium - International Astronomical Union ◽

10.1017/s0074180900083571 ◽

1996 ◽

Vol 176 ◽

pp. 547-555

Author(s):

E.R. Houdebine

Keyword(s):

Main Sequence ◽

Radiation Transfer ◽

Research Programme ◽

Significant Progress ◽

Wave Dissipation ◽

Empirical Modelling ◽

Spectral Signatures ◽

Outer Atmosphere ◽

Semi Empirical

We present the results of a long term research programme on the outer atmospheres of main-sequence dwarfs. Combining NLTE-radiation transfer calculations with high resolution spectroscopic observations have led to significant progress in understanding chromospheric physical properties and spectral signatures. We emphasize that in order to unravel the extremely complex physics of the outer atmosphere and its energy source, magnetic field and acoustic wave dissipation, one must isolate the influence of all stellar parameters.

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