Steam turbine nozzle segment having transitional interface, and nozzle assembly and steam turbine including such nozzle segment

摘要

Various embodiments include steam turbine static nozzles having transitional interfaces. In one embodiment a steam turbine static nozzle blade includes: an airfoil; an inner sidewall integral with a first side of the airfoil; and an outer sidewall integral with a second side of the airfoil; the inner sidewall and the outer sidewall each including: a first side having one of: an arcuate concave surface extending substantially an entire length of the sidewall, or an arcuate convex surface extending substantially the entire length of the sidewall; and a second side opposing the first side and having an angled interface extending substantially the entire length of the sidewall.

主权项

1. A steam turbine diaphragm assembly comprising:
an outer diaphragm ring; an inner diaphragm ring; an annulus of static nozzle blades between the inner diaphragm ring and the outer diaphragm ring, the annulus of static nozzle blades including:
a first static nozzle blade including: an airfoil; an inner sidewall integral with a first side of the airfoil; and an outer sidewall integral with a second side of the airfoil; the inner sidewall and the outer sidewall each including: a pressure side having an arcuate concave surface extending substantially an entire length of the sidewall; and a suction side having an arcuate convex surface extending substantially the entire length of the sidewall; anda second static nozzle blade including: an airfoil; an inner sidewall integral with a first side of the airfoil; and an outer sidewall integral with a second side of the airfoil; the inner sidewall and the outer sidewall each including: a first side having one of: an arcuate concave surface extending substantially an entire length of the sidewall, or an arcuate convex surface extending substantially the entire length of the sidewall, the first side complementing one of the pressure side or the suction side of the first static nozzle blade; and a second side opposing the first side and having an angled interface extending substantially the entire length of the sidewall, wherein the angled interface is formed from two distinct continuous sections each having a planar interface, wherein the two distinct continuous sections connect to form an angle.