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Electrochemical machining process for forming surface roughness elements on a gas turbine shroud

United States Patent

April 30, 2002
View the Complete Patent at the US Patent & Trademark Office
The back side recessed cooling surface of a shroud defining in part the hot gas path of a turbine is electrochemically machined to provide surface roughness elements and spaces therebetween to increase the heat transfer coefficient. To accomplish this, an electrode with insulating dielectric portions and non-insulating portions is disposed in opposition to the cooling surface. By passing an electrolyte between the cooling surface and electrode and applying an electrical current between the electrode and a shroud, roughness elements and spaces therebetween are formed in the cooling surface in opposition to the insulating and non-insulating portions of the electrode, hence increasing the surface area and heat transfer coefficient of the shroud.
Lee; Ching-Pang (Cincinnati, OH), Johnson; Robert Alan (Simpsonville, SC), Wei; Bin (Mechanicville, NY), Wang; Hsin-Pang (Rexford, NY)
General Electric Company (Schenectady, NY)
09/ 734,035
December 12, 2000
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT This invention was made with Government support under Contract No. DE-FC21-95MC31176 awarded by the Department of Energy. The Government has certain rights in this invention.