| 摘要 |
A rotor stage of a turbine has a rotational axis (XX), a shroud (35) and radially inward thereof a turbine blade (32) defined partly by a pressure side wall (38), a suction side wall (37) and a tip portion (46). The tip portion (46) has a pressure side tip rib (70) and a tip cavity floor (74) defining a tip cavity (76). The pressure side tip rib has a width W ps , a height H ps above the tip cavity and defines a tip gap G ps with the shroud. The pressure side tip rib has a sloping side (78) joining the tip cavity floor and having an angle ± ps to a radial line ZZ. The width W ps is in the range G ps to 5G ps , the height H ps is in the range 5G ps to 15G ps and the angle ± ps is in the range 20° to 70°. |
