Patent ID: 7063508
Filing Date: 2006-06-20
Classification: F01D,F05D

Abstract:
1. A turbine rotor blade for a radial flow turbine or a mixed turbine comprising: a first portion having a first suction surface and a first pressure surface; a second portion adjoining the first portion, having a second suction surface and a second pressure surface that are contiguous to the first suction surface and the first pressure surface, respectively; a leading edge that is arranged in the first portion, and from which an inlet flow enters into the turbine rotor blade from a substantially radial direction of the radial turbine rotor blade or from a direction between a radial direction and an axial direction of the mixed flow turbine rotor blade; a trailing edge at which the second suction surface and the second pressure surface of the second portion intersect with each other, and from which the flow is blown out in a substantially tangential direction of the turbine rotor blade; a root end configured to be fixed to a hub; and a tip end opposite to the root end, wherein the root end and the tip end define a height of the turbine rotor blade therebetween, wherein: the turbine rotor blade has a maximum thickness in the first portion adjacent to a boundary between the first portion and the second portion when viewed along a cross section in a plane perpendicular to a height direction of the turbine rotor blade over at least a part of the height of the turbine rotor blade, an imaginary plane that passes at a half of a distance between the first suction surface and the first pressure surface corresponds to a center line, the first suction surface corresponds to a suction surface line, and the trailing edge is arranged between an imaginary center line extended from a center line and an imaginary extension line extended from the suction surface line, the tip end includes a first tip end at a side where the leading edge exists and a second tip end at a side where the trailing edge exists, and a distance between an axis of the turbine rotor and an intersection of the first tip end and the leading edge is longer than a distance between the axis and the second tip end so that the turbine rotor blade deflects the inlet flow toward the axial direction of the turbine rotor blade on a meridian section, and the flow is blown out at the trailing edge toward the substantially tangential direction of the turbine rotor blade.