Research Papers: Gas Turbines: Structures and Dynamics

Experimental Study on the Friction Contact Between a Labyrinth Seal Fin and a Honeycomb Stator

[+] Author and Article Information
Tim Pychynski

Institut für Thermische Strömungsmaschinen (ITS),
Karlsruher Institut für Technologie (KIT),
Kaiserstr. 12,
Karlsruhe 76131, Germany
e-mail: tim.pychynski@kit.edu

Corina Höfler

Institut für Thermische Strömungsmaschinen (ITS),
Karlsruher Institut für Technologie (KIT),
Kaiserstr. 12,
Karlsruhe 76131, Germany
e-mail: corina.hoefler@kit.edu

Hans-Jörg Bauer

Institut für Thermische Strömungsmaschinen (ITS),
Karlsruher Institut für Technologie (KIT),
Kaiserstr. 12,
Karlsruhe 76131, Germany
e-mail: hans-joerg.bauer@kit.edu

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 30, 2015; final manuscript received October 5, 2015; published online November 17, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 138(6), 062501 (Nov 17, 2015) (9 pages) Paper No: GTP-15-1382; doi: 10.1115/1.4031791 History: Received July 30, 2015; Revised October 05, 2015

This paper presents results from an extensive experimental study on the rubbing behavior of labyrinth seal fins (SFs) and a honeycomb liner. The objective of the present work is to improve the understanding of the rub behavior of labyrinth seals by quantifying the effects and interactions of sliding speed, incursion rate, seal geometry, and SF rub position on the honeycomb liner. In order to reduce the complexity of the friction system studied, this work focuses on the contact between a single SF and a single metal foil. The metal foil is positioned in parallel to the SF to represent contact between the SF and the honeycomb double foil section. A special test rig was set up enabling the radial incursion of a metal foil into a rotating labyrinth SF at a defined incursion rate of up to 0.65 mm/s and friction velocities up to 165 m/s. Contact forces, friction temperatures, and wear were measured during or after the rub event. In total, 88 rub tests including several repetitions of each rub scenario have been conducted to obtain a solid data base. The results show that rub forces are mainly a function of the rub parameters incursion rate and friction velocity. Overall, the results demonstrate a strong interaction between contact forces, friction temperature, and wear behavior of the rub system. The presented tests confirm basic qualitative observations regarding blade rubbing provided in literature.

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Steinetz, B. M. , Hendricks, R. C. , and Munson, J. , 1998, “ Advanced Seal Technology Role in Meeting Next Generation Turbine Engine Goals,” AVT-PPS Paper No. 11.
Chupp, R. , Hendricks, R. , Lattime, S. , and Steinetz, B. , 2006, “ Sealing in Turbomachinery,” J. Propul. Power, 22(2), pp. 313–349. [CrossRef]
Denecke, J. , Färber, J. , Dullenkopf, K. , and Bauer, H.-J. , 2008, “ Interdependence of Discharge Behavior, Swirl Development and Total Temperature Increase in Rotating Labyrinth Seals,” ASME Paper No. GT2008-51429.
Lattime, S. , and Steinetz, B. , 2002, “ Turbine Engine Clearance Control Systems: Current Practices and Future Directions,” National Aeronautics and Space Administration, Glenn Research Center, Report No. NASA/TM-2002-211794.
Rossmann, A. , 2000, Die Sicherheit von Turbo-Flugtriebwerken, Band 2; Turbo Consult, Karlsfeld.
Pychynski, T. , Dullenkopf, K. , and Bauer, H.-J. , 2013, “ Theoretical Study on the Origin of Radial Cracks in the Fins of Labyrinth Seals,” ASME Paper No. GT2013-94834.
Dorfman, M. , Erning, U. , and Mallon, J. , 2002, “ Gas Turbines Use Abradable Coatings for Clearance-Control Seals,” Sealing Technol., 2002(1), pp. 7–8 [CrossRef]
Sporer, D. , and Fortuna, D. , 2012, “ Braze Materials for Brazing Seal Honeycomb: Trends, Challenges and a Market Outlook,” Brazing and Soldering (2012), IBSC 5th International Conference, Las Vegas, NV, Apr. 22–25, ASM International, pp. 51–58.
Smarsly, W. , Zheng, N. , Vivo, E. , Tuffs, M. , Schreiber, K. , Defer, B. , Langlade-Bomba, C. , Anderson, O. , Goehler, H. , Simms, N. , and McColvin, G. , 2005, “ Advanced High Temperature Turbine Seals Materials and Designs,” Mater. Sci. Forum, 492–493, pp. 21–26. [CrossRef]
Sporer, D. , and Shiembob, L. , 2004, “ Alloy Selection for Gas Path Seal Systems,” ASME Paper No. GT2004-53115.
Jacquet-Richardet, G. , Torkhani, M. , Cartraud, P. , Thouverez, F. , Baranger, T. N. , Herran, M. , Gibert, C. , Baguet, S. , Almeida, P. , and Peletan, L. , 2013, “ Rotor to Stator Contacts in Turbomachines—Review and Application,” Mech. Syst. Signal Process., 40(2), pp. 401–420. [CrossRef]
Laverty, W. F. , 1982, “ Rub Energetics of Compressor Blade Tip Seals,” Wear, 75(1), pp. 1–20. [CrossRef]
Emery, A. F. , Wolak, J. , Etemad, S. , and Choi, S. R. , “ An Experimental Investigation of Temperatures Due to Rubbing at the Blade-Seal Interface in an Aircraft Compressor,” Wear, 91(2), pp. 117–130. [CrossRef]
Wang, H. , 1996, “ Criteria for Analysis of Abradable Coatings,” Surf. Coat. Technol., 79(1–3), pp. 71–75. [CrossRef]
Chappel, D. , Vo, L. , and Howe, H. , 2001, “ Gas Path Blade Tip Seals: Abradable Seal Material Testing at Utility Gas and Steam Turbine Operating Conditions,” ASME Paper No. GT2001-0583.
Taylor, T. A. , Thompson, B. W. , and Aton, W. , 2007, “ High-Speed Rub Wear Mechanism in IN-718 vs. NiCrAl-Bentonite,” Surf. Coat. Technol., 2002(4–7), pp. 698–703. [CrossRef]
Padova, C. , Dunn, M. , Barton, J. , Turner, K. , Turner, A. , and DiTommaso, D. , 2011, “ Casing Treatment and Blade-Tip Configuration Effects on Controlled Gas Turbine Blade Tip/Shroud Rubs at Engine Conditions,” ASME J. Turbomach., 133(1), pp. 713–723. [CrossRef]
Padova, C. , Dunn, M. , Barton, J. , Turner, K. , and Steen, T. , 2011, “ Controlled Fan Blade Tip/Shroud Rubs at Engine Conditions,” ASME Paper No. GT2011-45223.
Sutter, G. , and Ranc, N. , 2010, “ Flash Temperature Measurement During Dry Friction Process at High Sliding Speed,” Wear, 268(11–12), pp. 1237–1242. [CrossRef]
Cuny, M. , Philippon, S. , Chevrier, P. , and Garcin, F. , 2014, “ Experimental Measurement of Dynamic Forces Generated During Short-Duration Contacts: Application to Blade-Casing Interactions in Aircraft Engines,” Exp. Mech., 54(2), pp. 101–114. [CrossRef]
Stringer, J. , and Marshall, M. B. , 2012, “ High Speed Wear Testing of an Abradable Coating,” J. Wear, 294–295, pp. 257–263. [CrossRef]
Mandard, R. , Witz, J. F. , Boidin, X. , Fabis, J. , Desplanques, Y. , and Meriaux, J. , 2014, “ Interacting Force Estimation During Blade/Seal Rubs,” Tribol. Int., 82, pp. 504–513. [CrossRef]
Legrand, M. , and Pierre, C. , 2009, “ Numerical Investigation of Abradable Coating Wear Through Plastic Constitutive Law: Application to Aircraft Engines,” ASME Paper No. DETC2009-87669.
Williams, R. J. , 2011, “ Simulation of Blade Casing Interaction Phenomena in Gas Turbines Resulting From Heavy Tip Rubs Using an Implicit Time Marching Method,” ASME Paper No. GT2011-45495.
Millecamps, A. , Brunel, J. F. , Dufrénoy, P. , Garcin, F. , and Nucci, M. , 2010, “ Influence of Thermal Effects During Blade-Casing Contact Experiments,” ASME Paper No. DETC2009-86842.
Batailly, A. , Legrand, M. , and Pierre, C. , 2011, “ Influence of Abradable Coating Wear Mechanical Properties on Rotor Stator Interaction,” ASME Paper No. GT2011-45189.
Batailly, A. , Cuny, M. , Legrand, M. , and Philippon, S. , 2013, “ Numerical-Experimental Confrontation in the Simulation of Tool/Abradable Material Interaction,” ASME J. Eng. Gas Turbines Power, 135(6), p. 062102. [CrossRef]
Faraoun, H. I. , Seichepine, J. L. , Coddet, C. , Aourag, H. , Zwick, J. , Hopkins, N. , Hopkins, N. , Sporer, D. , and Hertter, M. , 2006, “ Modelling Route for Abradable Coatings,” Surf. Coat. Technol., 200(22–23), pp. 6578–6582. [CrossRef]
Seichepine, J. L. , Faraoun, H. I. , Peyraut, F. , Chandler, P. , Coddet, C. , Sporer, D. , Hertter, M. , and Sellars, C. , 2008, “ Numerical Simulation of the Thermo-Mechanical Behaviour of Thermally Sprayed Abradable Coatings,” http://www.mtu.de/en/technologies/engineering_news/production/Hertter_Numerical_simulation.pdf
Peyraut, F. , Seichepine, J. L. , Coddet, C. , and Hertter, M. , 2008, “ Finite-Element Modeling of Abradable Materials–Identification of Plastic Parameters and Issues on Minimum Hardness Against Coating’s Thickness,” Int. J. Simul. Multidiscip. Des. Optim., 2(3), pp. 209–215. [CrossRef]
Borel, M. A. , Nicoll, A. R. , Schläpfer, H. W. , and Schmid, R. K. , 1989, “ The Wear Mechanisms Occurring in Abradable Seals in Gas Turbines,” Surf. Coat. Technol., 39–40(Pt 1), pp. 117–128. [CrossRef]
Marscher, W. D. , 1980, “ A Phenomenological Model of Abradable Wear in High Performance Turbomachinery,” Wear, 59(1), pp. 191–211. [CrossRef]
Rathmann, U. , Olmes, S. , and Simeon, A. , 2007, “ Sealing Technology–Rub Test Rig for Abrasive/Abrable Systems,” ASME Paper No. GT2007-27724.
Delebarre, V. , Wagner, D. , Paris, J. Y. , Dessein, G. , Denape, J. , and Gurt-Santanach, J. , 2014, “ An Experimental Study of the High-Speed Interaction Between a Labyrinth Seal and an Abradable Coating in a Turbine-Engine Application,” Wear, 316(1), pp. 109–118. [CrossRef]
Bill, R. C. , and Ludwig, L. , 1980, “ Wear of Seal Materials Used in Aircraft Propulsion Systems,” Wear, 59(1), pp. 165–189. [CrossRef]
Marscher, W. D. , 1982, “ Thermal versus Mechanical Effects in High Speed Sliding,” Wear, 79(1), pp. 129–143. [CrossRef]
Chupp, R. , Lau, Y. C. , Ghasripoor, F. , Baldwin, D. , Ng, C. , McGovern, T. , and Berkeley, D. , 2004, “ Development of Higher Temperature Abradable Seals for Gas Turbine Applications,” ASME Paper No. GT2004-53029.
Gardner, L. , Insausti, A. , Ng, L. T. , and Ashraf, M. , 2010, “ Elevated Temperature Material Properties of Stainless Steel Alloys,” J. Constr. Steel Res., 66(5), pp. 634–647. [CrossRef]
Ochs, M. , Schulz, A. , and Bauer, H. J. , 2010, “ High Dynamic Range Infrared Thermography by Pixelwise Radiometric Self-Calibration,” Infrared Phys. Technol., 53(2), pp. 112–119. [CrossRef]
Herrmann, N. , Dullenkopf, K. , and Bauer, H.-J. , 2013, “ Flexible Seal Strip Design for Advanced Labyrinth Seals in Turbines,” ASME Paper No. GT2013-95424.
Ghasripoor, F. , Turnquist, N. A. , Kowalczyk, M. , and Couture, B. , 2004, “ Wear Prediction of Strip Seals Through Conductance,” ASME Paper No. GT2004-53297.
Komanduri, R. , and Hou, Z. B. , 2001, “ Analysis of Heat Partition and Temperature Distribution in Sliding Systems,” Wear, 251(1–12), pp. 925–938. [CrossRef]
Bansal, D. , and Streator, J. , 2009, “ A Method for Obtaining the Temperature Distribution at the Interface of Sliding Bodies,” Wear, 266(7–8), pp. 721–732. [CrossRef]
Archard, J. F. , and Hirst, W. , 1956, “ The Wear of Metals Under Unlubricated Conditions,” Proc. R. Soc. London, Ser. A, 236(1206), pp. 397–410. [CrossRef]


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Fig. 1

Schematic drawing of a honeycomb liner and the three extreme rub positions of a labyrinth SF

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Fig. 2

Axial front view of the rub test rig

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Fig. 3

Imprints of inclined SF2 and perpendicular SF3 before first rub test (in mm): (a) whole fin and (b) fin tip region

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Fig. 4

Close-up view of the measuring equipment

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Fig. 5

Typical incursion profile

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Fig. 6

Test matrix for all five rub scenarios (S1–S5) with varying incursion rate and rub speed

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Fig. 7

Typical wear profile of the metal foil after rubbing with indicated initial foil geometry (left: side view and right: front view)

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Fig. 8

Measured resulting radial and circumferential forces over time for all five rub scenarios: (a) S1: vrub=165m/s, s˙=0.024mm/s, (b) S2: vrub=55m/s, s˙=0.024mm/s, (c) S3: vrub=110m/s, s˙=0.25mm/s, (d) S4: vrub=165m/s, s˙=0.65mm/s, (e) S5: vrub=55m/s, s˙=0.65mm/s, and (f) S3b: vrub=110m/s, s˙=0.25mm/s

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Fig. 9

Images from IR thermocamera showing foil steady-state temperature distribution for all five rub scenarios. The direction of rotor rotation is from right to left (temperatures in °C): (a) S1: vrub=165m/s, s˙=0.024mm/s, (b) S2: vrub=55m/s, s˙=0.024mm/s, (c) S3: vrub=110m/s, s˙=0.25mm/s, (d) S4: vrub=165m/s, s˙=0.65mm/s, (e) S5: vrub=55m/s, s˙=0.65mm/s, and (f) S3b: vrub=110m/s, s˙=0.25mm/s.

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Fig. 10

Foil temperatures extracted from the IR thermocamera images over time for all five rub scenarios both in the contact zone (0) and 1.4 mm below the contact zone (1.4): (a) S1: vrub=165m/s, s˙=0.024mm/s, (b) S2: vrub=55m/s, s˙=0.024mm/s, (c) S3: vrub=110m/s, s˙=0.25mm/s, (d) S4: vrub=165m/s, s˙=0.65mm/s, (e) S5: vrub=55m/s, s˙=0.65mm/s, and (f) S3b: vrub=110m/s, s˙=0.25mm/s

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Fig. 11

Wear ratio as well as time-averaged forces and temperatures for all rub scenarios: (a) wear ratio, (b) average radial forces, (c) average tangential forces, (d) average maximum foil temperature in contact zone, (e) average maximum foil temperature 1.4 mm below contact zone, and (f) average maximum peak temperature on fin tip

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Fig. 12

Abrasive wear rate over the final sliding distance for all rub tests

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Fig. 13

Normalized measured radial contact force over final sliding distance for all rub tests




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