Patent ID: 8118555
Filing Date: 2012-02-21
Classification: F01D,F04D,F05D,Y02T

Abstract:
1. A fluid-flow machine with at least one rotor having rotor blades, wherein at least one of the rotor blades includes, on a suction side, at least two zones of different surface finish, with one zone being positioned between a rotor blade leading edge, a casing line, a line SLW and a line EL and being provided with a boundary layer-energizing surface structure, with the line SLW extending on a relative duct height HW/W defined as follows: where: the line EL is a connecting line of all points E to form a chord-orthogonal projection line EL and where each point E is positioned further downstream by 15 percent of a chord length of the rotor blade from a corresponding point P established by vertical projection on the rotor blade suction side of an adjacent rotor blade profile, lambda is a stagger angle at a rotor casing section, S is a spacing of two rotor blades at the rotor casing section, WHK is a trailing edge duct width, W is a duct width, and HW is a distance between a hub and the line SLW measured in a direction of the duct width; wherein the boundary layer-energizing structure comprises at least one step edge orientated obliquely to the leading edge and a meridional flow direction.