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Enhanced heat transfer surface for cast-in-bump-covered cooling surfaces and methods of enhancing heat transfer

United States Patent

June 11, 2002
View the Complete Patent at the US Patent & Trademark Office
An annular turbine shroud separates a hot gas path from a cooling plenum containing a cooling medium. Bumps are cast in the surface on the cooling side of the shroud. A surface coating overlies the cooling side surface of the shroud, including the bumps, and contains cooling enhancement material. The surface area ratio of the cooling side of the shroud with the bumps and coating is in excess of a surface area ratio of the cooling side surface with bumps without the coating to afford increased heat transfer across the element relative to the heat transfer across the element without the coating.
Chiu; Rong-Shi Paul (Glenmont, NY), Hasz; Wayne Charles (Pownal, VT), Johnson; Robert Alan (Simpsonville, SC), Lee; Ching-Pang (Cincinnati, OH), Abuaf; Nesim (Lincoln City, OR)
General Electric Company (Schenectady, NY)
09/ 650,864
August 29, 2000
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.