| 摘要 |
A turbine comprises shrouded turbine rotor blades (12) and a surrounding static casing (14). Seals (22) acting between the blade shrouds (16) and the casing (14) efficiently restrict leakage of turbine working fluid over the outer surfaces of the shrouds between high and lower pressure (PH, PL) sides of the turbine rotor. The casing 14 includes resonator passages 28 positioned just ahead of the blades 12, in the region where seal leakage fluid passes into a gap G between the blade shrouds 16 and upstream static structure 11. The resonator passages 28 improve turbine efficiency by preventing or reducing cyclic reflux of the leakage fluid through the gap G into the main turbine passage in the low-pressure region between adjacent turbine blades. Applicable to axial flow steam and gas turbines.
|
