Turbine stage
AssigneeALSTOM Technology Ltd
InventorsBenjamin MEGERLE, Thomas MOKULYS, Said HAVAKECHIAN
Life of this patent
Estimating the term…
Abstract
A turbine stage includes a circumferentially distributed row of adjacent airfoils between which there is a flow passage. The passage has a surface, which in its unmodified form, defines a datum plane. A channel, located in the passage, extends in the direction of an airfoil pressure face from a point towards a leading edge line to a point towards a trailing edge line. The channel includes two channel walls angled relative to the datum plane. Relative to the datum plane, the channel has a low point, two high points, and a channel height, which is measured between the low point and the highest one of the high points. The channel provides a means to reduce secondary flow losses.
Claims24
A turbine stage comprising:
- a circumferentially distributed row of adjacent airfoils, each of the airfoils respectively having
- a pressure face,
- a suction face, and
- at least one end wall from which the airfoils radially extend, respectively;
- and
- a flow passage defined by a region between
- a pressure face of a first one of the airfoils,
- a suction face of a second one of the airfoils adjacent to the first airfoil,
- a leading edge line extending between lead edges of adjacent airfoils, and
- a trailing edge line extending between trailing edges of adjacent airfoils,
- wherein the flow passage has a defined datum plane extending between a base of the pressure face and a base of the suction face of adjacent airfoils, and
- wherein the turbine stage further comprises a channel, in the flow passage, adjacent to the pressure face and extending in the direction of the pressure face from a point towards the leading edge line to a point towards the trailing edge line, the channel including two angled and joined channels walls that, relative to the datum plane, form a low point at the joined channel walls, two high points, and a channel height, the channel height defining the radial distance between the low point and highest one of the high points.
Dependencies are inferred from the claim text.