| 摘要 |
A leaf seal (131) is proposed for effecting a seal between two coaxial and relatively rotating components 134, 50). The seal has an annular pack (50) of stacked leaves (132), the pack being mountable to a first one of the components (134) at root portions (40) of the leaves and extending towards the other component (50) such that end edges (136) of the leaves cooperate to define a seal surface (138) of the pack which is presented for air-riding interaction with a surface (137) of the other component during relative rotation between the components such that, in use, a pressure drop is maintained axially across the pack. The seal surface (138) of the pack, which is preferably provided in the form of an inner bore extending through the annular pack of leaves, incorporates a plurality of hydrodynamic liftgenerating recesses (139) spaced circumferentially around the pack. Each said recess extends circumferentially across a plurality (142) of adjacent leaves in the pack, each of which leaves (142) being spaced radially from said surface (137) of the other component along at least part of its end edge (136). |
