Turbine airfoil of composite material and method of manufacturing thereof

摘要

A turbine blade having a root and a tip and an airfoil with a core section made of composite material and a protective sheath or layer joined to the composite core at a location or locations exposed to erosion is described with the composite core of the airfoil being continuous from a location in vicinity of the root to a location in vicinity of the tip of the blade and including a section which widens with distance from the rotational axis along the length of the airfoil and which ends at the location in vicinity of the tip of the blade. The protective sheath or layer is secured by interference fit with widening section of the core.

主权项

1. A turbine blade, comprising:
a root; a tip; an airfoil extending therebetween with a core section made of composite material; a protective sheath joined to the core section at least in an area of the airfoil exposed to erosion, the core section of the airfoil is continuous from a location in a vicinity of the root to a location in a vicinity of the tip of the blade and comprises a section which widens from the rotational axis along the length of the airfoil and which ends at the location in the vicinity of the tip of the blade, wherein the protective sheath comprises separate parts joined to the core section, the separate parts comprising a leading edge cover, a trailing edge cover, a first covering sheet for a pressure side of the airfoil, and a second covering sheet for a suction side of the airfoil; and an interference fit provided for the protective sheath by the widening section of the core section configured for preventing movement of the protective sheath along the core section in a radially outward direction.