Interação fluido estrutura de um gerador eólico com pás inteligentes

Abstract

A design study is conducted on the effect of bend-twist coupling over the power of horizontal axis wind turbines. Using a specific unidirectional carbon-epoxy lamination sequence, a laminated composite is obtained whose mechanical stresses are coupled in its bending and twisting. Given the aerodynamic forces on the blade during its operation, mechanical stresses emerge in the material which, due to its bend-twist coupled behavior, conforms elastically, adapting its geometry to the flow. The tailoring of aeroelastic effects can be applied to wind turbine blades, bringing a new practical potential for the use of intrinsic wind energy, especially by favoring improved performance of wind turbines in urban areas and small sites. A blade is designed according to some specific parameters using the Blade Element Moment Theory. The effects of bend-twist coupling in the material are analyzed by fluid-structure interaction. From a qualitative analysis between three blades with different lamination sequences, ceteris paribus, an improvement of 3,42% in the extracted power is obtained with a smaller number of blades, which also brings an economic advantage.