Support pedestals for interconnecting a cover and nozzle band wall in a gas turbine nozzle segment

Patent · 01 January 2002

OSTI ID:874551

Yu, Yufeng Phillip ^[1]; Itzel, Gary Michael ^[1]; Webbon, Waylon Willard ^[2]; Bagepalli, Radhakrishna ^[3]; Burdgick, Steven Sebastian ^[3]; Kellock, Iain Robertson ^[1]

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1. Simpsonville, SC
2. Greenville, SC
3. Schenectady, NY

A gas turbine nozzle segment has outer and inner band portions. Each band portion includes a nozzle 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 the apertures of the impingement plate to cool the nozzle wall. Structural pedestals interconnect the cover and nozzle wall and pass through holes in the impingement plate to reduce localized stress otherwise resulting from a difference in pressure within the chamber of the nozzle segment and the hot gas path and the fixed turbine casing surrounding the nozzle stage. The pedestals may be cast or welded to the cover and nozzle wall.

• Research Organization: General Electric Company (Schenectady, NY)
• DOE Contract Number: FC21-95MC31176
• Assignee: General Electric Company (Schenectady, NY)
• Patent Number(s): US 6413040
• OSTI ID: 874551
• Country of Publication: United States
• Language: English

Related Subjects

/415/
apertures
band
casing
cast
cavities
cavity
chamber
cool
cooling
cover
defining
difference
fixed
flow
gas
gas turbine
holes
hot
hot gas
impingement
inner
interconnect
interconnecting
localized
nozzle
nozzle segment
opposite
otherwise
outer
pass
path
pedestals
plate
portion
portions
pressure
reduce
resulting
segment
stage
steam
stress
structural
supplied
support
surrounding
turbine
turbine nozzle
wall
welded