Abstract
Labyrinth-honeycomb seals are a state-of-the-art sealing technology commonly used in aero-engine interstage seal. The undesirable severe rub between the seal fins and the honeycomb due to the clearance change may induce the cracking of the seal fins. A pervious study investigated the wear of the seal fins at different radial incursion rates. However, due to the axial thrust and mounting clearance, the axial rub between the seal fins and the honeycomb may occur. Hence, this paper focuses on the influence of the axial rub added in the radial rub on the wear of the seal fins. The rub tests results, including rubbing forces and temperature, wear rate, worn morphology, cross-sectional morphology and energy dispersive spectroscopy results, are presented and discussed. Overall, the participation of the axial rub leads to higher rubbing forces, temperature, and wear rate. The tribo-layer on the seal fin is thicker and the cracks are more obvious at high axial incursion rate. These phenomena indicate the axial rub has a negative influence on the wear of the seal fins and should be avoided.
Highlights
IntroductionAs non-contact seal, are widely used in the aero-engine interstage seal for its simple design, long lifetime and applicability under extreme operating conditions [1,2]
Since the the radial radial without incursion rate was toto thethe axial incursion raterate in the folincursion was constant, constant,the theincursion incursionrate raterefers refers axial incursion in the lowing if there is no special description
This paper investigates the influence of the axial rub on the wear of the seal fins through the rub tests between the labyrinth seal fins and the honeycomb with radial and axial rub
Summary
As non-contact seal, are widely used in the aero-engine interstage seal for its simple design, long lifetime and applicability under extreme operating conditions [1,2]
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