Reduction in the noise produced by a rotor blade of a wind...

F - Mech Eng,Light,Heat,Weapons – 03 – D

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F03D 11/00 (2006.01) F03D 1/06 (2006.01)

Patent

CA 2353904

Rotor blades for wind power installations are known in many different forms. In a wind power installation the rotors or the rotor blades thereof represent the main source of sound. For reasons relating to acceptance and noise prevention laws, the aim should/must be that of minimising the levels of sound emission as wind power installations are often also set up in the proximity of residential accommodation. The levels of sound emission which hitherto occur with a wind power installation or a wind power converter also mean that wind power installations are faced with resistance from populated areas because of the sound they produce and for that reason such installations can be accepted sometimes with difficulty or not at all as authorities responsible for planning permission refuse permission for wind power installations because of the existing environmental requirements, noise also being an environmentally polluting factor. Therefore the object of the invention is further to improve the noise emission of wind power installations. Wind power installation rotor blade comprising means for reducing the sound produced by a rotor blade, wherein the means is formed by a fluid-repellent layer and/or surface which is provided at least on a surface portion of the rotor blade.

Les pales de rotor pour éoliennes sont connues sous différentes formes. Les rotors ou leurs pales constituent la principale source de bruit dans une éolienne. Pour respecter les législations en matière de protection contre les bruits et afin de mieux faire accepter les éoliennes, il est nécessaire de chercher à maintenir les émissions sonores produites par les éoliennes à un niveau le plus faible possible, d'autant plus que ces dernières doivent être installées fréquemment à proximité de bâtiments d'habitation. Les émissions sonores produites jusqu'à maintenant par une éolienne provoquent dans la population des réactions d'opposition. Les éoliennes ont par conséquent des difficultés à s'imposer, voire ne peuvent absolument pas s'imposer, car les autorités compétentes refusent de délivrer des autorisations d'installation, en raison des législations en vigueur concernant l'environnement, le bruit constituant également une nuisance pour l'environnement. L'invention vise par conséquent à réduire davantage les émissions sonores produites par des éoliennes. A cet effet, la pale du rotor est pourvue de moyens servant à réduire le bruit qu'elle produit, ces moyens étant constitués d'une couche et/ou d'une surface hydrophobe, formée au moins sur une partie de la surface de la pale.

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