| 摘要 |
A seal assembly ( 50 ) controls leakage of working fluid through an annular gap (G) between a static component ( 16 ) and a rotary component ( 28 ) in a turbomachine. The fixed and moving components ( 16, 28 ) each have stepped diameters including a plurality of circumferentially and axially extending lands ( 56, 58 ) that confront each other across the annular gap (G). They are complementarily formed such that the annular gap is maintained over the axial extent of the seal assembly. Both components ( 16, 18 ) are provided with rows of fins ( 60, 62 ) which extend circumferentially of the lands and project radially therefrom towards each other. The rows of fins 60 of the static component 16 are preferably unequally spaced apart with respect to the rows of fins 62 of the rotating component 16 , so producing a vernier seal arrangement.
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