NDLI: Hydrodynamic Air-Riding in Leaf Seals

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ingo, H. J. Jahn Gillespie, David Cooper, Paul
Copyright Year	2013
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.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791855140
DOI	10.1115/GT2013-95585
Volume Number	Volume 3A: Heat Transfer
Conference Proceedings	ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2013-06-03
Publisher Place	San Antonio, Texas, USA
Access Restriction	Subscribed
Subject Keyword	Design Geometry Leakage Lift (fluid dynamics) Rotors Wear Fluid structure interaction Engineering prototypes Flow (dynamics) Machinery Pressure Steady state
Content Type	Text
Resource Type	Article

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