Aeroacoustic Noise Measurements of a Wind Turbine with BSDS Blades Using an Acoustic Array

Simley, Eric; Moriarty, Patrick; Palo, S. E.

doi:10.2514/6.2010-642

Cited by 4 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The source of this noise (which is generated in the frequency range between 400 and 630 Hz) probably arises from the blade tower interaction. This inboard noise caused by the turbine nacelle and blade tower interaction has also been observed and reported in the literature [ 34 , 35 ].…”

Section: Application To the Winphase 10 Wind Turbinesupporting

confidence: 77%

Computational Acoustic Beamforming for Noise Source Identification for Small Wind Turbines

Lien

Yee

2017

International Scholarly Research Notices

View full text Add to dashboard Cite

This paper develops a computational acoustic beamforming (CAB) methodology for identification of sources of small wind turbine noise. This methodology is validated using the case of the NACA 0012 airfoil trailing edge noise. For this validation case, the predicted acoustic maps were in excellent conformance with the results of the measurements obtained from the acoustic beamforming experiment. Following this validation study, the CAB methodology was applied to the identification of noise sources generated by a commercial small wind turbine. The simulated acoustic maps revealed that the blade tower interaction and the wind turbine nacelle were the two primary mechanisms for sound generation for this small wind turbine at frequencies between 100 and 630 Hz.

show abstract

Section: Application To the Winphase 10 Wind Turbinesupporting

confidence: 77%

Computational Acoustic Beamforming for Noise Source Identification for Small Wind Turbines

Lien

Yee

2017

International Scholarly Research Notices

View full text Add to dashboard Cite

show abstract

“…It has many applications such as for high-speed train [37], flying aircraft [38 -39] and wind turbine [7,8,10,12,40,41], etc.. A microphone array is composed of a number of microphones, the phase and amplitude of acoustic signal received by each microphone may be different due to their different distance from noise sources. Then the difference of phase and amplitude can be employed by some post processing algorithm to locate the positions of noise sources.…”

Section: Detection Of Noise Sources By Microphones Array Techniquementioning

confidence: 99%

Research status on aero-acoustic noise from wind turbine blades

Yang

2013

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Abstract. This paper describes the noise mechanisms and categories of modern large wind turbine and main noise sources. Then the latest progresses in wind turbine noise researches are described from three aspects: noise prediction model, detection of noise sources by microphone array technique and methods for noise reduction. Although the turbine is restricted to horizontal axis wind turbines, the noise prediction model and reduction methods also can be applied to other turbines when the noise mechanisms are similar. Microphone array technique can be applied to locate any kind of noise sources.

show abstract

“…Such unsteady three-dimensional characteristics are related to the Reynolds number, turbulence intensity of the free stream flow, and the turbulence components in the boundary layers near the T.E. [20]. In addition, the wake, due to vortex shedding in the case of blunt T.E.s, may, not only result in resonance in turbines and compressor rotor blades, but also cause structural problems in multi-stage compressors or turbines, because they can make an unsteady loading in the next-stage blade [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Flatback Trailing Edge Airfoil to Reduce Noise in Power Generation Cycle

Shin

Kim²,

Kim

et al. 2017

Energies

View full text Add to dashboard Cite

Turbo machinery is an essential part in the power generation cycle. However, it is the main source of noise that annoys workers and users, and contributes to environmental problems. Thus, it is important to reduce this noise when operating the power generation cycle. This noise is created by a flow instability on the trailing edge of the rotor blade-an airfoil that becomes a section of the rotor blade of the rotating machine-manufactured as a blunt trailing edge (T.E.), with a round or flatback shape, rather than the ideal sharp T.E. shape, for the purposes of production and durability. This increases the tonal noise and flow-induced vibrations at a low frequency, owing to vortex shedding behind T.E. when compared with a sharp T.E. In order to overcome this problem, the present study investigates the oblique T.E. shape using numerical simulations. In order to do so, flow was simulated using large eddy simulation (LES) and the noise was analyzed by acoustic analogy coupled with the LES result. Once the simulation results were verified using the flatback airfoil measurements of the Sandia National Laboratories, numerical prediction was performed to analyze the flow and the noise characteristics for the airfoils, which were modified to have oblique trailing edge angles of 60 • , 45 • , and 30 •. From the simulation results of the oblique T.E. airfoil, it could be seen that the vortex shedding frequency moves in accordance with the oblique angle and that the vortex shedding noise characteristics change according to the angle, when compared to the flatback T.E. airfoil. Therefore, it is considered that modifying the flatback T.E. airfoil with an appropriate oblique angle can reduce noise and change the tonal frequency to a bandwidth that is suitable for mechanical systems.

show abstract

Aeroacoustic Noise Measurements of a Wind Turbine with BSDS Blades Using an Acoustic Array

Cited by 4 publications

References 12 publications

Computational Acoustic Beamforming for Noise Source Identification for Small Wind Turbines

Computational Acoustic Beamforming for Noise Source Identification for Small Wind Turbines

Research status on aero-acoustic noise from wind turbine blades

Numerical Analysis of Flatback Trailing Edge Airfoil to Reduce Noise in Power Generation Cycle

Contact Info

Product

Resources

About