Patent ID: 8061981

Claim:
A blade intended to be exposed to a gas flow at high speed, during operation of a flow machine comprising the blade, the blade comprising a front end designed to face towards the incoming gas flow and a rear end, the front end being provided with a concave area that forms, during operation, a stagnation point for the incoming gas flow at a distance in front of an outer blade surface that defines the concave area so that the outer blade surface is thereby at least partially protected from the incoming gas flow, the blade comprising a first and second side wall defining a central cavity, and wherein a joint that joins together the first and second side walls is positioned within the concave area and there is no flow communication between the concave area and the central cavity, the concave area extends from a root of the blade to a top of the blade, and the concave area is more pronounced at at least one of the root of the blade and the top of the blade than at a region between the root of the blade and the top of the blade.