Hydrodynamic air-riding in leaf seals

Jahn, Ingo H. J., Gillespie, David and Cooper, Paul (2013). Hydrodynamic air-riding in leaf seals. In: Proceedings of ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. GT2013: Heat Transfer. ASME Turbo Expo 2013: Turbine Technical Conference and Exposition, San Antonio, TX, USA, (1-10). 3-7 June, 2013. doi:10.1115/GT2013-95585

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Author Jahn, Ingo H. J.
Gillespie, David
Cooper, Paul
Title of paper Hydrodynamic air-riding in leaf seals
Conference name ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
Conference location San Antonio, TX, USA
Conference dates 3-7 June, 2013
Proceedings title Proceedings of ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. GT2013: Heat Transfer
Place of Publication New York, NY, USA
Publisher American Society of Mechanical Engineers (ASME) International Gas Turbine Institute
Publication Year 2013
Sub-type Fully published paper
DOI 10.1115/GT2013-95585
ISBN 9780791855140
Volume 3A
Start page 1
End page 10
Total pages 10
Collection year 2014
Language eng
Formatted Abstract/Summary
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.
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Presented during Paper Session "Brush and Leaf Seals" as Paper No. GT2013-95585. Published under "Internal Air Systems and Seals (With Turbomachinery)".

Document type: Conference Paper
Collections: School of Mechanical & Mining Engineering Publications
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Created: Fri, 29 Nov 2013, 09:58:51 EST by Katie Gollschewski on behalf of School of Mechanical and Mining Engineering