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Title: Apparatus and methods for relieving thermally induced stresses in inner and outer bands of thermally cooled turbine nozzle stages

Abstract

To control the temperature mismatch between the inner and outer bands and covers forming plenums with the inner and outer bands on sides thereof remote from the hot gas path, passages extend from the leading edge of the covers in communication with the hot gases of combustion to the trailing edge of the covers in communication with the hot gas flowpath. A mixing chamber is provided in each passage in communication with compressor discharge air for mixing the hot gases of combustion and compressor discharge air for flow through the passage, thereby heating the cover and minimizing the temperature differential between the inner and outer bands and their respective covers. The passages are particularly useful adjacent the welded or brazed joints between the covers and inner band portions.

Inventors:
 [1];  [2];  [3]
  1. (Guilderland, NY)
  2. (Clifton Park, NY)
  3. (Milton Mills, NH)
Issue Date:
Research Org.:
General Electric Company (Schenectady, NY)
OSTI Identifier:
874457
Patent Number(s):
6394749
Assignee:
General Electric Company (Schenectady, NY) NETL
DOE Contract Number:  
FC21-95MC31176
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
apparatus; methods; relieving; thermally; induced; stresses; inner; outer; bands; cooled; turbine; nozzle; stages; control; temperature; mismatch; covers; forming; plenums; remote; hot; gas; path; passages; extend; leading; edge; communication; gases; combustion; trailing; flowpath; mixing; chamber; provided; passage; compressor; discharge; air; flow; heating; cover; minimizing; differential; useful; adjacent; welded; brazed; joints; band; portions; gas flow; hot gas; hot gases; /415/

Citation Formats

Yu, Yufeng Phillip, Itzel, Gary Michael, and Correia, Victor H. S. Apparatus and methods for relieving thermally induced stresses in inner and outer bands of thermally cooled turbine nozzle stages. United States: N. p., 2002. Web.
Yu, Yufeng Phillip, Itzel, Gary Michael, & Correia, Victor H. S. Apparatus and methods for relieving thermally induced stresses in inner and outer bands of thermally cooled turbine nozzle stages. United States.
Yu, Yufeng Phillip, Itzel, Gary Michael, and Correia, Victor H. S. Tue . "Apparatus and methods for relieving thermally induced stresses in inner and outer bands of thermally cooled turbine nozzle stages". United States. https://www.osti.gov/servlets/purl/874457.
@article{osti_874457,
title = {Apparatus and methods for relieving thermally induced stresses in inner and outer bands of thermally cooled turbine nozzle stages},
author = {Yu, Yufeng Phillip and Itzel, Gary Michael and Correia, Victor H. S.},
abstractNote = {To control the temperature mismatch between the inner and outer bands and covers forming plenums with the inner and outer bands on sides thereof remote from the hot gas path, passages extend from the leading edge of the covers in communication with the hot gases of combustion to the trailing edge of the covers in communication with the hot gas flowpath. A mixing chamber is provided in each passage in communication with compressor discharge air for mixing the hot gases of combustion and compressor discharge air for flow through the passage, thereby heating the cover and minimizing the temperature differential between the inner and outer bands and their respective covers. The passages are particularly useful adjacent the welded or brazed joints between the covers and inner band portions.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

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