Hybrid turbine blade including multiple insert sections

摘要

A hybrid turbine blade and method of fabrication, comprising a shank portion and an airfoil portion. The airfoil portion comprising a composite outer structure having a recess formed therein and an alternating stack of at least one composite section and at least two insert sections disposed in the recess. The outer composite structure and the at least one composite section having a first density. The at least two insert sections having a second mass density, which is less than the first mass density. The composite outer structure and the alternating stack of at least one composite section and at least two insert sections together define an airfoil portion that meets all mechanical load carrying requirements of said hybrid turbine blade such that no load transfer needs to occur through said at least two insert sections.

主权项

1. A hybrid turbine blade comprising:
a shank portion; and an airfoil portion including an outer composite structure and having a recess formed therein, the airfoil portion comprising: at least one composite section having a first density; at least two insert sections each having a second mass density which is less than said first mass density, the at least two insert sections disposed in alternating laminate stacked relationship with the at least one composite section and defining an alternating laminate stack of the at least one composite section and the at least two insert sections, wherein the alternating laminate stack of the at least one composite section and the at least two insert sections is disposed in the recess and having a major axis extending along a span of the airfoil portion, a minor axis extending along a chord of the airfoil portion and a thickness extending perpendicular to the major axis and through a thickness of the airfoil portion, wherein an outermost layer of the at least two insert sections is bonded to the outer composite structure, and wherein said outer composite structure, said alternating laminate stack of the at least one composite section and said at least two insert sections together define an airfoil shape.