Hydrodynamic air-riding in leaf seals
Paper
Paper/Presentation Title | Hydrodynamic air-riding in leaf seals |
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Presentation Type | Paper |
Authors | Jahn, Ingo H. I., Gillespie, David and Cooper, Paul |
Journal or Proceedings Title | Proceedings of ASME Turbo Expo 2013: Turbine Technical Conference and Exposition |
Journal Citation | 3A |
Number of Pages | 10 |
Year | 2013 |
Publisher | American Society of Mechanical Engineers (ASME) |
Place of Publication | United States |
ISBN | 9780791855140 |
Digital Object Identifier (DOI) | https://doi.org/10.1115/GT2013-95585 |
Web Address (URL) of Paper | https://asmedigitalcollection.asme.org/GT/proceedings-abstract/GT2013/V03AT15A015/247472 |
Web Address (URL) of Conference Proceedings | https://asmedigitalcollection.asme.org/GT/GT2013/volume/55140 |
Conference/Event | ASME Turbo Expo 2013: Turbine Technical Conference and Exposition |
Event Details | ASME Turbo Expo 2013: Turbine Technical Conference and Exposition Parent ASME Turbo Expo: Turbine Technical Conference and Exposition Delivery In person Event Date 03 to end of 07 Jun 2013 Event Location San Antonio. United States |
Abstract | Leaf seals are filament seals for use at static to rotating interfaces in rotating machinery. They are capable of withstanding significant pressure differences while minimising leakage. One of their advantages over comparable filament seals is the ability of the leaves to generate significant hydrodynamic lift at their tips. If this force is sufficient to lift the leaf tip away from the rotor, leaf wear is eliminated and an infinite life seal is created. In order to design seals that are capable of operating in this mode, a good understanding of the hydrodynamic effect and how it interacts with the seal is required. This paper presents a detailed theoretical and experimental investigation into hydrodynamic air-riding in leaf seals. First the hydrodynamic lift is investigated by analysing the flow field and forces generated between a static structure resembling the leaf tip geometry and a moving surface resembling the rotor. This allows the fundamental effects behind air-riding to be identified and quantified. Next a coupled model is presented, which captures the interactions between the lift force and the leaf tip movements. This gives a full picture of the steady-state fluid-structure interactions controlling air-riding in leaf seals. Based on these results several guidelines for obtaining air-riding are extracted. Finally the predictions from the coupled model are compared to results from a high speed test campaign using a prototype leaf seal. Good agreement is found, confirming the presence of hydrodynamic air-riding in leaf seals and demonstrating the accuracy of the presented coupled model. |
Keywords | Internal Air Systems and Seals |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 4001. Aerospace engineering |
Public Notes | There are no files associated with this item. |
Byline Affiliations | University of Oxford, United Kingdom |
Alstom Power, United Kingdom |
https://research.usq.edu.au/item/z2140/hydrodynamic-air-riding-in-leaf-seals
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