Patent ID: 11933264
Assignee: VESTAS WIND SYSTEMS A/S
Field: Other special machines (Mechanical engineering)
Classification: CPC F  B  Y | IPC B  F

Claim 18:
19. A wind turbine blade for use on a wind turbine, comprising:
a main body forming at least a lengthwise portion of the blade, the main body including a plurality of layers such that a cross section of the main body includes a first region of a first density that surrounds a second region having a volume of void space and being of a second density, the first density being greater than the second density due to the volume of void space in the second region;
at least one recess formed in the first region of the main body;
a structural element positioned in the at least one recess, wherein the structural element is configured to reinforce the lengthwise portion of the blade under load during use of the wind turbine; and
a surface layer that bounds the first region and that forms an exterior surface of the blade,
wherein the first and/or second density varies along the lengthwise portion of the blade.