Investigating the application of a honeycomb abradable lining in the turbine stage of an aero-engine

Zhang, Boxiu; Marshall, Matthew

doi:10.1016/j.triboint.2018.04.013

Cited by 21 publications

(11 citation statements)

References 16 publications

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“…The results showed that the rubbing forces decreased with the rubbing speed, and the rubbing temperature was around 800 °C. Zhang et al [ 14 ] investigated the rubbing behaviors of the honeycomb with a nickel–aluminide filler in a labyrinth seal system. They pointed out that the nickel–aluminide filler with high aluminium content made the honeycomb hard to fracture, but easy to fracture after ageing.…”

Section: Introductionmentioning

confidence: 99%

The Wear of Seal Fins during High-Speed Rub between Labyrinth Seal Fins and Honeycomb Stators at Different Incursion Rates

Lü

et al. 2021

Materials

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Labyrinth seals as a noncontact sealing technology are widely used in aero-engine. To improve the efficiency of the aero-engine, the clearance between the rotor and stator must be as small as possible. However, the change of the clearance between the rotor and stator because of thermal expansion, vibration, mechanical loading may lead to undesirable high-speed rub, which will lead to the cracking of the seal fins. This paper focuses on the wear of the seal fin after the rub and presents the rubbing tests between seal fins and the metal honeycomb under rubbing speed of 380 m/s and incursion rates between 20 and 180 μm/s, with an incursion depth of 1500 μm and a temperature of 350 °C. The rubbing force and temperature were recorded, and the seal fins were checked by SEM and EDS. The results show that the wear mechanism of seal fins changed from oxidation wear and adhesive wear to delamination wear and then to metal wear with the increasing incursion rate. The axial cracks appeared on the worn surface of the seal fins due to the cracking of tribo-layers under periodic thermomechanical stress. The wear mechanism of the seal fin also has a great influence on the rubbing force and temperature.

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Section: Introductionmentioning

confidence: 99%

The Wear of Seal Fins during High-Speed Rub between Labyrinth Seal Fins and Honeycomb Stators at Different Incursion Rates

Lü

et al. 2021

Materials

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“…As described in the previous studies [1,2], during tests with discrete fins the dominant material removal mechanism was via extrusion, along with a limited amount of compacted material either peeling away from the rub track or rebounding behind the contact. Whilst it would appear that the extrusion mechanism is dominant as a consequence of the blunt nature of the fin geometry (Figure 2), given contact is parallel to the flat top surface, it is unclear how much the discrete fin sample has influenced the test, particularly as a a) compress and release mechanism is also observed.…”

Section: Figure 1 Different Contact Methods Under Different Working Condition A) Single Blade [3] B) Blades Assembly [3] C) Fin/abradablementioning

confidence: 80%

“…The aim of this study is to investigate the impact of fin arc length and radius on the material removal mechanism present in a labyrinth fin seal contact, with a specific focus on the forces and temperatures developed. Tests are undertaken using the experimental set up previously detailed for discrete fin samples [1,2], with a new disc employed that is capable of investigating both a long fin segment, as well as a series of segments joined together to form a continuous fin (i.e. a whole ring).…”

Section: Figure 2 Discrete Fin Sample Geometrymentioning

confidence: 99%

An investigation into the role of specimen geometry when undertaking tribological testing on seal fin components

Zhang

Marshall

Lewis

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Labyrinth seal systems are used in aeroengines to seal the clearance, the understanding of the wear mechanism of labyrinth seal system is necessary to achieve better sealing performance. In this work a series of tests are conducted on a high-speed test rig capable of fin tip speeds of 100 m/s. With force and temperature measurements recorded in each case, the influence of specimen geometry is investigated. Surface examination and debris analysis is also performed using microscopy post-test. The wear mechanism was found to be influenced by fin geometry. A discrete fin was observed to trigger a more efficient material removal mechanism at both incursion conditions. Where the fin segment and ring-shaped fin leading to increased temperatures and material smearing. The heat dissipate role of fin was also observed during test where longer contact time of fin and abradable gives better heat removal performance.

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“…The analysis approaches common for turbine blade rub could be used to analyze the labyrinth seal rub. Zhang et al [ 13 ] investigated the influence of the nickel–aluminide filler, which was filled in honeycomb, on the rubbing behaviors in a labyrinth seal system. They pointed out that the nickel–aluminide filler with high aluminum content made the abradable material easy to fracture after ageing.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Axial Rub Added in the Radial Rub on the Wear of the Seal Fins during the High Speed Rub of Labyrinth-Honeycomb Seal

Lü

et al. 2021

Materials

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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.

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Investigating the application of a honeycomb abradable lining in the turbine stage of an aero-engine

Cited by 21 publications

References 16 publications

The Wear of Seal Fins during High-Speed Rub between Labyrinth Seal Fins and Honeycomb Stators at Different Incursion Rates

The Wear of Seal Fins during High-Speed Rub between Labyrinth Seal Fins and Honeycomb Stators at Different Incursion Rates

An investigation into the role of specimen geometry when undertaking tribological testing on seal fin components

The Influence of the Axial Rub Added in the Radial Rub on the Wear of the Seal Fins during the High Speed Rub of Labyrinth-Honeycomb Seal

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