Acoustics

Aeroacoustics of Darrieus Wind Turbine

Johannes Weber, Stefan Becker, Christoph Scheit, Jens Grabinger and Manfred Kaltenbacher, 24 October 2014

Operating wind turbines generate tonal and broadband noises affecting the living environment adversely; especially small wind turbines located in the vicinity of human living places. Therefore, it is important to determine the level of noise pollution of such type of wind turbine installation. The current study carries out numerical prediction for aerodynamic noise radiated from an H-Darrieus Vertical Axis Wind Turbine. Incompressible LES (Large Eddy Simulation) is conducted to obtain the instantaneous turbulent flow field. The noise predictions are performed by the Ffowcs Williams and Hawking...

Operating wind turbines generate tonal and broadband noises affecting the living environment adversely; especially small wind turbines located in the vicinity of human living places. Therefore, it is important to determine the level of noise pollution of such type of wind turbine installation. The current study carries out numerical prediction for aerodynamic noise radiated from an H-Darrieus Vertical Axis Wind Turbine. Incompressible LES (Large Eddy Simulation) is conducted to obtain the instantaneous turbulent flow field. The noise predictions are performed by the Ffowcs Williams and Hawking...

Evaluating the Impact of Wind Turbine Noise on Health-Related Quality of Life

Daniel Shepherd, David McBride, David Welch, Kim N Dirks, Erin M Hill, Noise Health, 2011

We report a cross-sectional study comparing the health-related quality of life (HRQOL) of individuals residing in the proximity of a wind farm to those residing in a demographically matched area sufficiently displaced from wind turbines. The study employed a nonequivalent comparison group posttest-only design. Self-administered questionnaires, which included the brief version of the World Health Organization quality of life scale, were delivered to residents in two adjacent areas in semirural New Zealand. Participants were also asked to identify annoying noises, indicate their degree of noise...

Noise Emission of a 200 kW Vertical Axis Wind Turbine

Erik Mollerstrom, Fredric Otttermo, Jonny Hylander and Hans Bernhoff, Energies, 29 December 2015

The noise emission from a vertical axis wind turbine (VAWT) has been investigated. A noise measurement campaign on a 200 kW straight-bladed VAWT has been conducted, and the result has been compared to a semi-empirical model for turbulent-boundary-layer trailing edge (TBL-TE) noise. The noise emission from the wind turbine was measured, at wind speed 8 m/s, 10 m above ground, to 96.2 dBA. At this wind speed, the turbine was stalling as it was run at a tip speed lower than optimal due to constructional constraints. The noise emission at a wind speed of 6 m/s, 10 m above...

Noise Propagation from a Vertical Axis Wind Turbine

Erik Mollerstrom, Sebastian Larsson, Fredric Ottermo, Jonny Hylander and Lars Baath, Inter-noise, 2014

Initial noise measurements were performed on a 200kW vertical axis wind turbine (VAWT) and results were compared to that of a Vestas V27, a similar size horizontal axis wind turbine (HAWT). Multiple recording units were placed in line downwind of the turbine to investigate noise propagation. The frequency distribution of the noise were analyzed indicating that the VAWT has lower relative levels for frequencies under 3000 Hz, especially within 600-1200 Hz. Furthermore, VAWT noise seems to occur more around the same frequencies as the natural background noise, increasing masking...

Noise pollution from wind turbines is an important public health issue, and strict regulations regarding noise levels for nearby residents to a wind farm is a necessity. The fact that more turbines equals higher noise levels constitutes a problem, an expansion of turbines is needed but the nearby residents should not be affected. Noise levels can be measured, but, similar to other environmental attentions, the public's perception of the noise impact of wind turbines is in part a subjective determination. Vertical axis wind turbines are suitable to be established within the densely populated...

Vertical Axis Wind Turbine Acoustics

Charlie Pearson, Cambridge University Engineering Department, September 2013

Increasing awareness of the issues of climate change and sustainable energy use has led to growing levels of interest in small-scale, decentralised power generation. Small-scale wind power has seen signi_cant growth in the last ten years, partly due to the political support for renewable energy and the introduction of Feed In Tari_s, which pay home owners for generating their own electricity. Due to their ability to respond quickly to changing wind conditions, smallscale vertical axis wind turbines (VAWTs) have been proposed as an e_cient solution for deployment in built up areas, where...

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