WIND TURBINE BLADE

摘要

A wind turbine blade which is at least 45m long. The blade has a main axis in the lengthwise direction from root to tip and an aerodynamic shell surrounding a spar which extends in a lengthwise direction along a substantial proportion of the blade at least a portion of the half of the shell closest to the tip. The blade is reinforced by high stiffness fibres having a Young's modulus to density ratio of greater than 50 GPa/(g·cm−3), and an electrical resistivity of greater than 1010 Ω·cm. The fibres are biaxial with a first axis angled with respect to the main axis at an acute angle and a second axis angled with respect to the main axis at an acute angle in the opposite sense to the first angle.

主权项

1. A wind turbine blade comprising:
a main axis in a lengthwise direction from root to tip; and an aerodynamic shell surrounding a spar which extends in the lengthwise direction along a substantial proportion of the blade wherein the wind turbine blade is at least 45 m long wherein at least a portion of a half of the shell closest to the tip being reinforced by high stiffness fibres having a Young's modulus to density ratio of greater than 50 GPa/(g·cm−3), and an electrical resistivity of greater than 1010 Ω·cm wherein the high stiffness fibres being biaxial with a first axis angled with respect to the main axis at an acute angle and a second axis angled with respect to the main axis at an acute angle in an opposite sense to the first axis angle.