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

United States Patent

6,394,749
May 28, 2002
View the Complete Patent at the US Patent & Trademark Office
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.
Yu; Yufeng Phillip (Guilderland, NY), Itzel; Gary Michael (Clifton Park, NY), Correia; Victor H. S. (Milton Mills, NH)
General Electric Company (Schenectady, NY)
09/ 761,635
January 18, 2001
The Government of the United States of America has rights in this invention pursuant to COOPERATIVE AGREEMENT NO. DE-FC21-95MC31176 awarded by the U.S. Department of Energy.