Abstract
Finger seals represent a new type of non-contacting seals that allow leakages comparable, or lower than those of the brush seals, while at the same time eliminating the major brush seal drawback: contact and debris production at the shaft/seal interface. This paper presents a numerical investigation of the sealing behavior of a finger seal, which consists of a padded laminate, a padless laminate, and a backplate with a pressure dam. The flow, pressure, and the leakage through a full assembly are obtained by solving the combined full Navier-Stokes and energy equations. Results indicate that the leakage through the pressure chamber varies only with the axial pressure differential. Leakage depends on the axial pressure differential and the finger lifting distance. The lifting force on the pad bottom consists of the hydrodynamic lifting force and the pressure force due to the axial pressure differential. In order for the finger seal to be fully adaptive, the hydrodynamic lifting force has to be dominating over the axial effects.
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