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Research Papers: Gas Turbines: Structures and Dynamics

High-Speed Characterization of a Prototype Leaf Seal on an Advanced Seal Test Facility

[+] Author and Article Information
Michael J. Pekris

Structures and Transmissions,
Rolls-Royce plc.,
Derby DE24 8BJ, UK
e-mail: michael.pekris@rolls-royce.com

Adele Nasti, Gervas Franceschini

Structures and Transmissions,
Rolls-Royce plc.,
Derby DE24 8BJ, UK

Ingo H. J. Jahn

School of Mechanical and
Mining Engineering,
University of Queensland,
Brisbane, QLD 4072, Australia

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 7, 2015; final manuscript received December 11, 2015; published online March 15, 2016. Editor: David Wisler.

J. Eng. Gas Turbines Power 138(8), 082503 (Mar 15, 2016) (9 pages) Paper No: GTP-15-1561; doi: 10.1115/1.4032422 History: Received December 07, 2015; Revised December 11, 2015

Advanced contacting seals, such as leaf seals or brush seals, can offer reduced leakage during engine operation when compared to conventional labyrinth seals. The flexible elements of these seals provide better compliance with the rotor during flight maneuvers. The functionality and performance retention attributes of an engine-scale prototype leaf seal have been investigated on a seal test facility at Rolls-Royce that achieves engine-representative pressures and speeds and allows dynamic control of the seal position relative to the rotor, both concentric and eccentric. In this paper, the experimental setup and the test method are described in detail, including the quantification of the measurement uncertainty developed to ASME standard PTC 19.1. Experimental data are presented that show the variations in leakage and torque over typical variations of the test parameters. Insight is gained into the interactions between the operating pressure and speed and the concentric and eccentric movements imposed on the seal.

Copyright © 2016 by Rolls-Royce plc
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Pekris, M. , Franceschini, G. , Jahn, I. H. J. , and Gillespie, D. R. H. , 2015, “ Experimental Investigation of a Leaf Seal Prototype at Engine-Representative Speeds and Pressures,” ASME J. Eng. Gas Turbines Power 138(7), p. 072502.

Figures

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Fig. 1

Advanced seal test facility schematic

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Fig. 2

Prototype leaf seal cross section

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Fig. 3

Automated test types—flow and torque test

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Fig. 4

Automated test types—eccentric housing test

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Fig. 5

Automated test types—rotor growth (interference) test

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Fig. 6

Normalized effective clearance versus ΔP for 3000 rpm rotational speed

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Fig. 7

Normalized effective clearance versus ΔP for 6000 rpm rotational speed

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Fig. 8

Normalized seal torque versus differential pressure, 6000 rpm rotational speed

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Fig. 9

Normalized air temperature rise across seal versus differential pressure for 3000 rpm rotational speed

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Fig. 10

Normalized air temperature rise across seal versus differential pressure for 6000 rpm rotational speed

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Fig. 11

Normalized effective clearance versus housing eccentricity with changing speed and differential pressure

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Fig. 12

Normalized torque versus housing eccentricity with changing speed and differential pressure

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Fig. 13

Normalized air temperature rise across seal versus housing eccentricity with changing speed and differential pressure

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Fig. 14

Normalized seal torque versus rotor growth (interference), rotational speed and differential pressure

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Fig. 15

Normalized effective clearance versus rotor growth (interference), rotational speed and differential pressure

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Fig. 16

Comparison of start/end normalized effective clearance versus differential pressure, 3000 rpm rotational speed

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Fig. 17

Comparison of start/end normalized seal torque versus differential pressure, 3000 rpm rotational speed

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Fig. 18

Comparison of start/end normalized seal air temperature rise versus differential pressure, 3000 rpm rotational speed

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