Steam turbine nozzle trailing edge modification for improved sta

Details Steam turbine nozzle trailing edge modification for improved sta Steam turbine nozzle trailing edge modification for improved sta

1998-08-13

2000-08-29

Verdier, Christopher

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Plural distributing means immediately upstream of runner

4152082, 4152101, 298891, 2988922, 2988923, F01D 904

Patent

active

061098698

ABSTRACT:
In a reverse design for partitions of a steam turbine having decreased throat dimension therebetween with increased radial height, the trailing edges are set back from approximately mid-span to a tip of the partition to increase the throat dimension with radial height relative to the prior reverse design configuration. Secondary vortices adjacent the radial inner and outer end walls are maintained separated from on another by the design, thereby minimizing or eliminating aerodynamic losses from interactive secondary flow effects while improving flow distribution at the bucket entrance and stage exit. In a further embodiment, a free vortex design having increasing throat dimension from the hub to the tip may be modified to further increase the throat dimension from the hub to approximately the mid-span by providing setbacks along the trailing edge of the partition between the hub and mid-span. The setbacks can be provided as original equipment or retrofitted in the field by cutting and removing trailing edge portions.

REFERENCES:
patent: 1062258 (1913-05-01), Schlotter
patent: 4826400 (1989-05-01), Gregory

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