Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between runner portion and static part – Between blade edge and static part
Patent
1997-06-23
2000-02-22
Verdier, Christopher
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between runner portion and static part
Between blade edge and static part
415115, 4151731, 416 97R, 416224, 416 92, F01D 1102
Patent
active
060273062
ABSTRACT:
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.
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Y.W. Kim et al., "A Summary of the Cooled Turbine Blade Tip Heat Transfer and Film Effectiveness Investigations Performed by Dr. D.E. Metzger", Presented at the International Gas Turbine and Aeroengine Congress and Exposition, The Hague, Netherlands, Jun. 13-16, 1994.
D.E. Metzger et al., "Cavity Heat Transfer on a Transverse Grooved Wall in a Narrow Flow Channel", Journal of Heat Transfer, vol. 111/73, Feb. 1989.
General Electric Company
Patnode Patrick K.
Snyder Marvin
Verdier Christopher
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