Stationary turbine blade having diaphragm construction
A stationary steam turbine blade diaphragm structure is described comprising blades having outer and inner integrally formed ring portions forming inner and outer diaphragm rings, each blade having a concave suction surface over substantially the full width of the blade such that steam flow over the suction surface continuously increases in velocity to near a trailing edge of the blade thereby avoiding flow separation along the suction surface, and each blade further having an alpha angle which is substantially constant from base end to tip end of the blade, a stagger angle which is substantially constant from base end to tip end of the blade, a rate of convergence of area between adjacent blades which decreases from leading to trailing edge of the blade, an inlet included angle which is smaller than ninety degrees, an inlet metal angle which increases from about 82 degrees at a tip end of the blade to about 109 degrees at a base end of the blade, a pitch/chord ratio which is substantially constant from the tip end to the base end of the blade, and a maximum thickness/chord ratio which is substantially constant from tip end to base end of the blade.
- Assignee:
- Westinghouse Electric Corp., Pittsburgh, PA (United States)
- Patent Number(s):
- US 5221181; A
- Application Number:
- PPN: US 7-851711
- OSTI ID:
- 6349584
- Resource Relation:
- Patent File Date: 16 Mar 1992
- Country of Publication:
- United States
- Language:
- English
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