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Turbine blade tip flow discouragers

United States Patent

6,027,306
February 22, 2000
View the Complete Patent at the US Patent & Trademark Office
A turbine assembly comprises a plurality of rotating blade portions in a spaced relation with a stationery shroud. The rotating blade portions comprise a root section, a tip portion and an airfoil. The tip portion has a pressure side wall and a suction side wall. A number of flow discouragers are disposed on the blade tip portion. In one embodiment, the flow discouragers extend circumferentially from the pressure side wall to the suction side wall so as to be aligned generally parallel to the direction of rotation. In an alternative embodiment, the flow discouragers extend circumferentially from the pressure side wall to the suction side wall so as to be aligned at an angle in the range between about 0.degree. to about 60.degree. with respect to a reference axis aligned generally parallel to the direction of rotation. The flow discouragers increase the flow resistance and thus reduce the flow of hot gas flow leakage for a given pressure differential across the blade tip portion so as to improve overall turbine efficiency.
Bunker; Ronald Scott (Niskayuna, NY)
General Electric Company (Schenectady, NY)
08/ 880,960
June 23, 1997
This invention was made with government support under government contract number DEFC2195MC31176, awarded by the Department of Energy (DOE). The government has certain rights to this invention.