NDLI: Analysis of Finger Seal Lift Pads

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Peter, P. Galimutti Jerzy, T. Sawicki David, P. Fleming
Copyright Year	2009
Abstract	Analyses were performed on finger seal pads having a pressure drop across the pad at right angles to the direction of runner velocity. The film was tapered; the clearance could decrease in both the pressure flow and velocity directions. A substantial load could be carried solely due to the pressure flow; however, the bearing exhibited negative stiffness without film convergence in the velocity flow direction. This is in marked contrast to a full circular bearing or ring seal, where pressure flow alone produces a significant stiffness as long as the clearance converges in the flow direction. The performance of three different pad configurations has been evaluated: aspect ratios L/B of 0.5, 1 (square pad), and 2. Design examples pertaining to each aspect ratio were studied for a gas turbine seal. Results show that lowest leakage, highest load carrying capacity, and highest stiffness are attained for the wide-pad configuration, L/B = 0.5. This paper presents a detailed study of the pad; additional analysis needs to be done for the inclusion of the finger and many other considerations for designing a complete seal.
Sponsorship	International Gas Turbine Institute
Starting Page	941
Ending Page	950
Page Count	10
File Format	PDF
ISBN	9780791848876
DOI	10.1115/GT2009-59842
e-ISBN	9780791838495
Volume Number	Volume 6: Structures and Dynamics, Parts A and B
Conference Proceedings	ASME Turbo Expo 2009: Power for Land, Sea, and Air
Language	English
Publisher Date	2009-06-08
Publisher Place	Orlando, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Design Leakage Load bearing capacity Gas turbines Bearings Pressure drop Clearances (engineering) Stiffness Flow (dynamics) Pressure Stress
Content Type	Text
Resource Type	Article

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