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Estimation of the effect of shadow zone boundary for noise calculation on large wind turbines

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The prediction methods of wind turbine noise in common use are valid for weather conditions that correspond to moderate down-wind. In this study the up-wind propagation is examined for a point source (turbine hub) and plane source (turbine blades with the hub). Since the wind turbine noise limits are related either to an average—or the highest noise imission at the receiver, the up-wind propagation is considered for the wind speed of 10 m/s at 10 m above the ground surface (wind class W5). It is shown that the up-wind refraction results in the change of the effective sound power level of the wind turbine. It explains some up-wind measurement data.
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Keywords: 14.5.4; 21.6

Document Type: Research Article

Publication date: July 1, 2011

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