Patent ID: 9638040
Date: 2017-05-02
CPC Classifications: F01D,F04D,F05D,Y02T

Claim:
1. A blade of a row of rotor blades or stator blades for use in a turbomachine, comprising: a convex suction side, a concave pressure side′ a leading edge, onto which a flow passes, and a trailing edge, the flow passing away from the trailing edge, at least one contour recess provided on at least one chosen from the suction side and the pressure side, wherein the contour recess includes, a step edge, a contour corner, and a flank face provided between the step edge and the contour corner, wherein the contour recess extends over at least a part of a profile depth and a profile height of the blade and wherein the step edge extends, at least one point of its course of the step edge, obliquely to a meridional flow including a plurality of meridional flow lines around the blade, such that along one of the meridional flow lines passing over the step edge there is a contour receding in a meridional flow direction, wherein the step edge has a starting point and a downstream end point spaced apart by a finite meridional distance, wherein the step edge always crosses meridional flow lines at either a negative slope or positive slope, such that the step edge continuously gets closer to only one of a radially inner main flow path boundary and a radially outer main flow path boundary when proceeding in a downstream direction.