101 A study on aerodynamic noise reduction around wind turbine blade

The purpose of this research is to investigate the physical mechanisms associated with broadband tip vortex noise caused by rotating wind turbines. The flow and acoustic field around a wind turbine blade is simulated using compressible large-eddy simulation and direct noise simulation, with emphasis on the blade tip region. The far field aerodynamic noise is modeled using acoustic analogy. Aerodynamic performance and acoustic emissions are predicted for the actual tip shape and an ogee type tip shape. For the ogee type tip shape the sound pressure level decreases by 5 dB for frequencies above 4 kHz.

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J0503-4-2 A study on aerodynamic noise characteristics by wind turbine blade reforming

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2009.7.0_107 ◽

2009 ◽

Vol 2009.7 (0) ◽

pp. 107-108

Author(s):

Toshiya OHISHI ◽

Hideki ONODERA

Keyword(s):

Wind Turbine ◽

Turbine Blade ◽

Wind Turbine Blade ◽

Aerodynamic Noise ◽

Noise Characteristics

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Numerical study on noise reduction of wind turbine blade vortex generator

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/358/2/022026 ◽

2019 ◽

Vol 358 ◽

pp. 022026

Author(s):

Li Gang ◽

Zhang Zhengtao ◽

Zou Pingguo

Keyword(s):

Wind Turbine ◽

Noise Reduction ◽

Turbine Blade ◽

Numerical Study ◽

Vortex Generator ◽

Wind Turbine Blade

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Aeroacoustics Simulation Around a Wind Turbine Blade Using Compressible LES and Linearized Euler Equations

Volume 1: Fora, Parts A, B, C, and D ◽

10.1115/fedsm2003-45368 ◽

2003 ◽

Author(s):

Oliver Fleig ◽

Chuichi Arakawa

Keyword(s):

Wind Turbine ◽

Euler Equations ◽

Turbine Blade ◽

Acoustic Waves ◽

Separated Flow ◽

Wind Turbine Blade ◽

Large Region ◽

Aerodynamic Noise ◽

Far Field ◽

Linearized Euler Equations

There is a strong need to investigate aerodynamic noise caused by large and fast rotating wind turbines, especially trailing edge and tip noise. This work constitutes the first part of a project which aims to simulate the broadband tip noise emitted when the wind turbine is in operation. Several aeroacoustics methods are analyzed and their suitability for a typical wind turbine blade is assessed. A stationary wind turbine blade in an incident flow with a large region of separated flow is studied. The surface pressure fluctuations are calculated using compressible Large-Eddy simulation (LES). The aerodynamic noise perceived in the far-field is predicted by simulating the propagation of the pressure perturbations using LES and Linearized Euler equations (LEE) in the near field and Kirchhoff’s integral method in the far-field. It was found that for the present wind turbine blade with a large region of separated flow and thus relatively large fluctuations, LES with a fine enough mesh and a third-order upwind scheme is able to compute the propagation of acoustic waves as accurately as LEE with higher order schemes and separate treatment of acoustic perturbations. The method described in this paper will be used in the future to analyze a full wind turbine blade with the aim of optimizing the tip shape for reduced noise emission.

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