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Aerospace 2018, 5(3), 82; https://doi.org/10.3390/aerospace5030082

Continued Experimental Study on the Friction Contact between a Labyrinth Seal Fin and a Honeycomb Stator: Slanted Position

1
Institute of Thermal Turbomachinery, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
2
Robert Bosch GmbH, Robert-Bosch-Campus 1, 71272 Renningen, Germany
*
Author to whom correspondence should be addressed.
Received: 2 June 2018 / Revised: 21 July 2018 / Accepted: 2 August 2018 / Published: 7 August 2018
(This article belongs to the Special Issue Secondary Air Systems in Gas Turbine Engines)
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Abstract

Labyrinth seals are a state-of-the-art sealing technology to prevent and control leakage flows at rotor–stator interfaces in turbomachinery. Higher pressure ratios and the economical use of cooling air require small clearances, which lead to potential rubbing events. The use of honeycomb liners allows for minimal leakage by tolerating rub events to a certain extent. A previous study within an EU project investigated the complex contact conditions of honeycomb liners, with the idealized contact of a seal fin and a single parallel metal foil representing the honeycomb double foil section. In the present work, the results for the slanted foil position are shown and compared to the previous results. The variation of rub velocity, incursion speed, incursion rate, and seal geometry in a test rig allows for the identification of the influence on contact forces, temperatures, and wear. For the slanted position, significantly lower friction temperatures are observed, leading to a higher ratio of abrasive wear. Overall, the rub test results demonstrate strong interactions between the contact forces, friction temperatures, and wear. View Full-Text
Keywords: secondary air system; labyrinth seals; honeycomb liners; high-speed rubbing secondary air system; labyrinth seals; honeycomb liners; high-speed rubbing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Munz, O.; Pychynski, T.; Schwitzke, C.; Bauer, H.-J. Continued Experimental Study on the Friction Contact between a Labyrinth Seal Fin and a Honeycomb Stator: Slanted Position. Aerospace 2018, 5, 82.

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