Steam exit flow design for aft cavities of an airfoil

Patent · Tue Jan 01 00:00:00 EST 2002

OSTI ID:874478

Storey, James Michael ^[1]; Tesh, Stephen William ^[2]

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1. Clifton Park, NY
2. Simpsonville, SC

Turbine stator vane segments have inner and outer walls with vanes extending therebetween. The inner and outer walls have impingement plates. Steam flowing into the outer wall passes through the impingement plate for impingement cooling of the outer wall surface. The spent impingement steam flows into cavities of the vane having inserts for impingement cooling the walls of the vane. The steam passes into the inner wall and through the impingement plate for impingement cooling of the inner wall surface and for return through return cavities having inserts for impingement cooling of the vane surfaces. A skirt or flange structure is provided for shielding the steam cooling impingement holes adjacent the inner wall aerofoil fillet region of the nozzle from the steam flow exiting the aft nozzle cavities. Moreover, the gap between the flash rib boss and the cavity insert is controlled to minimize the flow of post impingement cooling media therebetween. This substantially confines outflow to that exiting via the return channels, thus furthermore minimizing flow in the vicinity of the aerofoil fillet region that may adversely affect impingement cooling thereof.

• Research Organization: General Electric Co., Schenectady, NY (United States)
• DOE Contract Number: FC21-95MC31176
• Assignee: General Electric Company (Schnectady, NY)
• Patent Number(s): US 6398486
• OSTI ID: 874478
• Country of Publication: United States
• Language: English

Related Subjects

steam
exit
flow
design
cavities
airfoil
turbine
stator
vane
segments
inner
outer
walls
vanes
extending
therebetween
impingement
plates
flowing
wall
passes
plate
cooling
surface
spent
flows
inserts
return
surfaces
skirt
flange
structure
provided
shielding
holes
adjacent
aerofoil
fillet
region
nozzle
exiting
moreover
gap
flash
boss
cavity
insert
controlled
minimize
post
media
substantially
confines
outflow
via
channels
furthermore
minimizing
vicinity
adversely
affect
steam flow
vanes extend
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