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Shroud leakage flow discouragers

United States Patent

February 26, 2002
View the Complete Patent at the US Patent & Trademark Office
A turbine assembly includes a plurality of rotor blades comprising a root portion, an airfoil having a pressure sidewall and a suction sidewall, and a top portion having a cap. An outer shroud is concentrically disposed about said rotor blades, said shroud in combination with said tip portions defining a clearance gap. At least one circumferential shroud leakage discourager is disposed within the shroud. The leakage discourager(s) increase the flow resistance and thus reduce the flow of hot gas flow leakage for a given pressure differential across the clearance gap to improve overall turbine efficiency.
Bailey; Jeremy Clyde (Middle Grove, NY), Bunker; Ronald Scott (Niskayuna, NY)
General Electric Company (Schenectady, NY)
09/ 575,704
July 19, 2000
FEDERAL RESEARCH STATEMENT The United States Government may have rights in this invention pursuant to contract number DE-FC21-95MC31176, awarded by the Department of Energy (DOE).