26-06-2014 дата публикации
Номер: US20140178207A1
A rotor stage of a turbine has a rotational axis, a shroud and radially inward thereof a turbine blade defined partly by a pressure side wall, a suction side wall and a tip portion. The tip portion has a pressure side tip rib and a tip cavity floor defining a tip cavity. The pressure side tip rib has a width W, a height Habove the tip cavity and defines a tip gap Gwith the shroud. The pressure side tip rib has a sloping side joining the tip cavity floor and having an angle αto a radial line ZZ. The width Wis in the range Gto 5G, the height His in the range 5Gto 15Gand the angle αis in the range 20° to 70°. 1. A rotor stage of a turbine comprisinga rotational axis,a shroud and radially inward thereofa turbine blade defined partly by a pressure side wall, a suction side wall and a tip portion,the tip portion has a pressure side tip rib and a tip cavity floor defining a tip cavity,{'sub': ps', 'ps', 'ps, 'the pressure side tip rib has a width W, a height Habove the tip cavity and defines a tip gap Gwith the shroud,'}{'sub': 'ps', 'the pressure side tip rib has a sloping side joining the tip cavity floor and having an angle αto a radial line ZZ,'}{'sub': ps', 'ps', 'ps, 'the width Wis in the range Gto 5G,'}{'sub': ps', 'ps', 'ps, 'the height His in the range 5Gto 15Gand'}{'sub': 'ps', 'the angle αis in the range 20° to 70°.'}2. A rotor stage of a turbine as claimed in claim 1 , wherein{'sub': ps', 'ps', 'ps, 'the width Wis in the range 2Gto 3G,'}{'sub': ps', 'ps', 'ps, 'the height His in the range 7Gto 8Gand'}{'sub': 'ps', 'the angle αis in the range 40° to 60°.'}3. A rotor stage of a turbine as claimed in claim 1 , wherein{'sub': ps', 'ps, 'the width Wis approximately 2.5G,'}{'sub': 'ps', 'the height is approximately 7Gand'}{'sub': 'ps', 'the angle αis approximately 45°.'}4. A rotor stage of a turbine as claimed in claim 1 , wherein the pressure side tip rib has a radially outer surface and the pressure side tip rib directly extends between the tip cavity floor and the ...
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