Patent ID: 9541061
Date: 2017-01-10
CPC Classifications: F02C,F03D,F05B,Y02E

Claim:
1. A wind turbine blade comprising: an airfoil shell comprising a suction side and an opposed pressure side, both sides extending between a leading edge and a trailing edge; a viscoelastic sublayer comprising a viscoelastic material integrally sandwiched between first and second load-bearing sublayers in a first portion of the shell, the load-bearing sublayers comprising a material having a modulus of elasticity at least 10 times greater than an average modulus of elasticity of the viscoelastic material, further comprising an aft transverse webbing wall of load-bearing material spanning between the pressure and suction sides within an aft 30% of a chord length of the shell; and a layer of viscoelastic material integrally sandwiched within the aft transverse webbing wall and oriented transversely to the chord length of the shell, and wherein the aft transverse webbing wall encloses an aft chamber between the pressure and suction sides and the trailing edge; and further comprising a core in the aft chamber and a further layer of the viscoelastic material in the core oriented transversely to the chord length, wherein the core has a lower density than the load-bearing material.