Steam turbine and blade or vane for a steam turbine
AssigneeSiemens Aktiengesellschaft
InventorsKarl-Heinrich Müller, Wilfried Ulm, Ralf Bell, Volker Simon
Life of this patent
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Abstract
The invention relates to a steam turbine (1) which has a flow duct (2) with a wall (3). Blading (5) is arranged in blading rings (55) in the flow duct (2). The wall (3) of the flow duct (2) has a grooved structure (6) which purposefully influences the flow of an active fluid (13) through the flow duct (2). In particular, a spacing surface (31) with a grooved structure (6) is located between each two blades or vanes (5) of a blading ring (55). The invention also relates to a blade or vane for a steam turbine.
Claims18
A steam turbine, comprising:
- a duct wall including at least one region having a grooved structure with spaced apart groove cusps, said duct wall defining a flow duct extending along an axis;
- at least one blading ring configuring blading in said flow duct;
- and
- a spacing surface disposed on said duct wall between adjacent ones of said blading, said grooved structure disposed on said spacing surface.
A steam turbine blading component, comprising a blading component selected from the group consisting of a blade and a vane, said blading component including:
- a root portion having a fastening portion for fastening said root portion to a steam turbine;
- a blading surface;
- a blading axis extending through said blading component;
- and
- an airfoil having an airofoil surface with a root region, a central region, and a tip region, said central region disposed between said tip region and said root region, said airfoil ending at said root portion of said blading surface;
- said blading surface having a grooved structure for influencing a flow of an active fluid around said blading surface, said grooved structure having spaced apart groove cusps, said grooved structure extending in said tip region and said root region, and said central region being smooth.
Dependencies are inferred from the claim text.