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Method of controlling the side wall thickness of a turbine nozzle segment for improved cooling

Patent ·
OSTI ID:874574
 [1]
  1. Schenectady, NY
+ Show Author Affiliations
A gas turbine nozzle segment has outer and inner bands and a vane extending therebetween. Each band has a side wall, a cover and an impingement plate between the cover and nozzle wall defining two cavities on opposite sides of the impingement plate. Cooling steam is supplied to one cavity for flow through apertures of the impingement plate to cool the nozzle wall. The side wall of the band has an inturned flange defining with the nozzle wall an undercut region. The outer surface of the side wall is provided with a step prior to welding the cover to the side wall. A thermal barrier coating is applied in the step and, after the cover is welded to the side wall, the side wall is finally machined to a controlled thickness removing all, some or none of the coating.
Research Organization:
General Electric Company (Schenectady, NY)
DOE Contract Number:
FC21-95MC31176
Assignee:
General Electric Company (Schenectady, NY)
Patent Number(s):
US 6418618
OSTI ID:
874574
Country of Publication:
United States
Language:
English

References (2)

Advances in Steam Path Technology journal April 1996
Development Requirements for an Advanced Gas Turbine System journal October 1995

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/29/
apertures
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band
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barrier
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coating
controlled
controlling
cool
cooling
cover
defining
extending
finally
flange
flow
gas
gas turbine
impingement
improved
inner
inturned
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method
nozzle
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opposite
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steam
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thermal
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