The impact of supporting tower on wind turbine noise emission

Zagubień, A.; Wolniewicz, Katarzyna

doi:10.1016/j.apacoust.2019.05.032

Cited by 24 publications

(17 citation statements)

References 16 publications

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“…However, for upwind turbines, there is no wake problem but there exists a wind velocity deficit in the vicinity of the support tower that leads to the generation of impulsive aerodynamic noise as discussed above. This impulsive loading is expected to be less for the smaller cross section support legs of a lattice-type tower and indeed Zagubień and Wolniewicz [31] found that upwind turbines supported on lattice-type towers produced about 10 dB less audible noise that turbines supported by cylindrical towers.…”

Section: Mechanisms and Control Of Wind Turbine Noise Generationmentioning

confidence: 97%

“…However, this work is the result of numerical investigations and needs to be verified with field measurements. If the presence of the tower is important for noise generation, then research may be needed to investigate possible modifications to the tower construction, such as changing the tower from a solid cylinder to a structure that is much less effective in allowing the air between the blade and tower to be compressed as the blade passes (for example, a lattice-type tower used for high voltage power lines [31]). Lattice towers were used to support the downwind turbines of the 1980s [1], and the interaction of the turbine blades with the flow disruption caused by the support legs was considered to be responsible for the thumping noise that residents complained of.…”

Section: Mechanisms and Control Of Wind Turbine Noise Generationmentioning

confidence: 99%

“…That is, the noise amplitude varies from maximum to minimum and back to maximum again in the time it takes consecutive blades to be adjacent to the rotor support tower. Zagubień and Wolniewicz [31] showed that the variation in turbine noise level is less for a lattice-type tower, but more work is needed to determine whether this translates to lower levels of amplitude modulation. Another possible explanation for amplitude modulation is the change in sound radiation directivity as blades are moving downward compared to when they are moving upward.…”

Section: Mechanisms and Control Of Wind Turbine Noise Generationmentioning

confidence: 99%

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Recent Advances in Wind Turbine Noise Research

Hansen

2020

Acoustics

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This review is focussed on large-scale, horizontal-axis upwind turbines. Vertical-axis turbines are not considered here as they are not sufficiently efficient to be deployed in the commercial generation of electricity. Recent developments in horizontal-axis wind turbine noise research are summarised and topics that are pertinent to the problem, but are yet to be investigated, are explored and suggestions for future research are offered. The major portion of recent and current research on wind turbine noise generation, propagation and its effects on people and animals is being undertaken by groups in Europe, UK, USA, Japan, Australia and New Zealand. Considerable progress has been made in understanding wind turbine noise generation and propagation as well as the effect of wind farm noise on people, birds and animals. However, much remains to be done to answer many of the questions for which answers are still uncertain. In addition to community concerns about the effect of wind farm noise on people and how best to regulate wind farm noise and check installed wind farms for compliance, there is considerable interest from turbine manufacturers in developing quieter rotors, with the intention of allowing wind farm installations to be closer to populated areas. The purpose of this paper is to summarise recent and current wind farm noise research work and the research questions that remain to be addressed or are in the process of being addressed. Topics that are the subject of on-going research are discussed briefly and references to recent and current work are included.

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Section: Mechanisms and Control Of Wind Turbine Noise Generationmentioning

confidence: 97%

Section: Mechanisms and Control Of Wind Turbine Noise Generationmentioning

confidence: 99%

Section: Mechanisms and Control Of Wind Turbine Noise Generationmentioning

confidence: 99%

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Recent Advances in Wind Turbine Noise Research

Hansen

2020

Acoustics

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“…Chrysochoidis-Antsos et al [12] conducted a wind resource assessment study for micro wind turbines, and they found that the azimuth of the acoustic barrier, expressed in wind field rotation angles, was found to be influential and resulted in changes of 50% to 130% with respect to annual energy yield. An analysis of the influence of wind and wind turbine tower structure on noise generation has been carried out by Zagubień and Wolniewicz [13], where they found that tall wind turbines with lattice towers emit much lower acoustic noise levels than those with tubular towers. Göçmen and Özerdem [14] analyzed six airfoils for a 10 kW wind turbine, and they adjusted the airfoils to decrease the noise and increase the efficiency of the wind turbine.…”

Section: Introductionmentioning

confidence: 99%

“…For this study, the BPM model is used to determine the sound pressure levels produced by the detachment of the turbulent boundary layer at the trailing edge and the method developed by Brooks and Marcollini (BM) [30] for vortex formation at the tip of the blade. We selected these two sources because the blade is from a small wind turbine, which is different from the ones usually analyzed; therefore, it is not affected by the turbulent incident flow [11,13].…”

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confidence: 99%

Theoretical and Experimental Analysis of Aerodynamic Noise in Small Wind Turbines

Dorrego¹,

Rios²,

Hernández-Escobedo³

et al. 2021

Energies

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This paper presents an analysis of sound pressure levels through theoretical modeling and experimental validation in a 1 kW small wind turbine. The models used in the theoretical analysis are BPM (Brooks, Pope, and Marcolini) and BM (Brooks and Marcolini), where wind turbine blades are divided in sections, and each section has its own contribution with respect to the total emitted sound pressure level. The noise propagation study and its experimental validation were accomplished within the requirements of the standard IEC 61400-11 Ed.3 and the standard NOM-081-SEMARNAT-1994. The comparative study of theoretical and experimental results showed that the BPM and BM methods have a maximum error of 5.5% corresponding to the rated wind speed of 10 m/s. However, at low wind speeds, the theoretical models fit well to experimental data, for example, in the range from 5 to 8 m/s. The experimental data showed that the rotor’s aerodynamic noise is more evident at low wind speed, because under these conditions, environmental noise is much less than wind turbine noise. Finally, to prevent possible negative effects on people’s health, there is a recommended minimum and suitable distance between small wind turbine installations and buildings.

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