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Research Papers: Gas Turbines: Structures and Dynamics

Investigation of Effective Groove Types for a Film Riding Seal

[+] Author and Article Information
S. M. Tibos

GE Power,
Newbold Road,
Rugby CV21 2NH, UK
e-mail: stacie.tibos@ge.com

J. A. Teixeira

Centre for Power Engineering,
Cranfield University,
College Road,
Cranfield,
Bedfordshire MK43 0AL, UK

C. Georgakis

GE Power,
Newbold Road,
Rugby CV21 2NH, UK

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received October 9, 2016; final manuscript received November 25, 2016; published online February 14, 2017. Editor: David Wisler.

J. Eng. Gas Turbines Power 139(7), 072503 (Feb 14, 2017) (8 pages) Paper No: GTP-16-1494; doi: 10.1115/1.4035601 History: Received October 09, 2016; Revised November 25, 2016

Over the past two decades, significant efforts have been made to introduce film riding sealing technology on large industrial or aerospace gas turbines. The main challenge comes from the high surface speeds and high temperatures, which lead to large thermal distortions. One approach to tackle the effect of thermally induced distortion is to design a seal to operate at a large film to limit the viscous heat generation. To design a seal pad that maximizes force at relatively high film heights, it is important to select the seal groove type that looks the most promising to deliver this characteristic. Several groove types have been assessed as part of this study. The most promising groove type is the Rayleigh step, which gives the strongest level of combined hydrostatic and hydrodynamic load support while also being easier to tessellate on individual seal segments. The results generated using a uniform grid Reynolds equation method show reasonable agreement with computational fluid dynamics (CFD) calculations. This provides confidence in the validity of the method, approach, and results.

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Figures

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Fig. 1

Wedge/tilted wedge

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Fig. 2

Circumferential pockets/Rayleigh step

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Fig. 4

Herringone grooves

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Fig. 5

Finite difference control volume in Cartesian coordinates

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Fig. 6

Trade-off plot for accuracy versus computational time

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Fig. 7

Nett unit force generation from hydrostatic effects

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Fig. 8

Nett unit force generation from hydrodynamic effects

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Fig. 9

Dimensionless load Ŵ against parameter Φ

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Fig. 10

Dimensionless load Ŵ against film height

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Fig. 11

Groove pattern for Rayleigh step design

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Fig. 12

Pressure contours for Rayleigh step design

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Fig. 13

Groove pattern for inclined groove design

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Fig. 14

Pressure contours for inclined groove design

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Fig. 15

Groove pattern for herringbone groove design

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Fig. 16

Pressure contours for herringbone groove design

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Fig. 17

Setup of the CFD model

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Fig. 18

Comparison of pressure contours for Rayleigh step design, CFD solution (top), Reynolds equation solver (bottom)

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