32-15 INSERȚIA METALICĂ ÎN PALETA ROTORULUI DE TURBINĂ EOLIANĂ DE PUTERE MICĂ
THE INSERT OF METAL IN THE ROTOR BLADE OF
THE LOW POWER WIND TURBINE
Attachment of the wind turbine rotor blade is made by a metal structure, that provides a rigid mounting and precise positioning as accurate as possible to the calculated direction angle of incidence of the air flow relative to the blade profile sections. The mechanical strength at static load for the blade is within acceptable limits even without metal insert. In real operating conditions, the wind gusts have the effect of a dynamic load upon the blade and the base material, fiberglass reinforced polyester (FRP) is subjected to fatigue stressed. This leads to micro cracks in the resin and gradually reaches the blade breakage. Therefore the recessed fitting area of the blade, which is an aerodynamically inactive area, must have a metal structure with maximum adhesion to FRP of the blade structure. The shape of this structure, the way of insertion into the interior of the blade, the depth of penetration, are issues which will be discussed in this paper.
Keywords: insert of metal, blade, rotor, wind turbine, FRP
Cuvinte cheie: inserție metalică, paletă, rotor, turbină eoliană, PAFS