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TECHNICAL PAPERS

Computational and Mathematical Modeling of Turbine Rim Seal Ingestion

[+] Author and Article Information
Nicholas J. Hills

Thermo-Fluid Mechanics Research Centre, University of Sussex, Brighton, BN1 9QT, UK

John W. Chew

School of Mechanical and Materials Engineering, University of Surrey, Surrey, GU2 7XH, UK

Alan B. Turner

Thermo-Fluid Mechanics Research Center, University of Sussex, Brighton, BN1 9QT, UK

J. Turbomach 124(2), 306-315 (Apr 09, 2002) (10 pages) doi:10.1115/1.1456461 History: Received November 20, 2000; Online April 09, 2002
Copyright © 2002 by ASME
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References

Bayley,  F. J., and Owen,  J. M., 1970, “The Fluid Dynamics of a Shrouded Disk System With a Radial Outflow of Coolant,” ASME J. Eng. Power, 92, pp. 335–341.
Chew,  J. W., 1989, “A Theoretical Study of Ingress for Shrouded Rotating Disc Systems With Radial Outflow,” ASME Paper 89-GT-187; also ASME J. Turbomach., 113, pp. 91–97.
Chew,  J. W., Dadkhah,  S., and Turner,  A. B., 1991, “Rim Sealing of Rotor-Stator Wheelspaces in the Absence of External Flow,” ASME Paper 91-GT-33; also ASME J. Turbomach., 114, pp. 433–438.
Campbell, D. A., 1978, “Gas Turbine Disc Sealing System Design,” Proc., AGARD Conf. on Seal Technology in Gas Turbine Engines, AGARD-CP-237.
Abe, T., Kikuchi, J., and Takeuchi, H., 1979. “An Investigation of Turbine Disc Cooling,” Paper GT30, 3rd CIMAC Congress, Vienna.
Kobayashi,  N., Matsumato,  M., and Shizuya,  M., 1984, “An Experimental Investigation of a Gas Turbine Disc Cooling System,” ASME J. Eng. Gas Turbines Power, 106, pp. 136–141.
Phadke,  U. P., and Owen,  J. M., 1988. “Aerodynamic Aspects of the Rim Sealing of Gas Turbine Rotor-Stator Systems, Parts 1–3,” Int. J. Heat Fluid Flow, 9, pp. 98–117.
Dadkhah,  S., Turner,  A. B., and Chew,  J. W., 1991, “Performance of Radial Clearance Rim Seals in Upstream and Downstream Wheelspaces,” ASME Paper 91-GT-32; also, ASME J. Turbomach., 114, pp. 439–445.
Hamabe, K., and Ishida, K., 1992, “Rim Seal Experiments and Analysis of a Rotor-Stator System With Non-axisymmetric Main Flow,” ASME Paper 92-GT-160.
Chew, J. W., Green, T., and Turner, A. B., 1994, “Rim Sealing of Rotor-Stator Wheelspaces in the Presence of External Flow,” ASME Paper 94-GT-126.
Green, T., and Turner, A. B., 1992, “Ingestion Into the Upstream Wheelspaces of an Axial Turbine Stage,” ASME Paper 92-GT-303.
Bohn, D., Rudzihski, B., Sturken, N., and Gartner, W., 2000, “Experimental and Numerical Investigation of the Influence of Rotor Blades on Hot Gas Ingestion Into the Upstream Cavity of an Axial Turbine Stage,” ASME Paper 2000-GT-284.
Hills, N. J., Chew, J. W., Green, T., and Turner, A. B., 1997, “Aerodynamics of Turbine Rim-Seal Ingestion,” ASME Paper 97-GT-268.
Roy, R. P., Xu, G., and Feng, J., 2000, “Study of Main-Stream Gas Ingestion in a Rotor-Stator Disk Cavity,” Paper AIAA-2000-3372.
Denton, J. D., 1993, “Loss Mechanisms in Turbomachines,” ASME Paper 93-GT-435.
Hartsel, J. E., 1972, “Prediction of Effects of Mass-Transfer Cooling on the Blade Row Efficiency of Turbine Airfoils,” AIAA Paper 72-11, 10th Aerospace Sciences Meeting, CA.
Wallis, A. M., Denton, J. D., and Demargne, A. A. J., 2000, “The Control of Shroud Leakage Flows to Reduce Aerodynamic Losses in a Low Aspect Ratio, Shrouded Axial Flow Turbine,” ASME Paper 2000-GT-475.
Pfau, A., Treiber, M., Sell, M., and Gyarmarthy, G., 2000, “Flow Interaction From the Exit Cavity of an Axial Turbine Blade Row Labyrinth Seal,” ASME Paper 2000-GT-481.
Wellborn, S. R., and Okiishi, T. H., 1998, “The Influence of Shrouded Stator Cavity Flows on Multistage Compressor Performance,” ASME Paper 98-GT-12.
Demargne, A. A. J., and Longley, J. P., 2000, “The Aerodynamic Interaction of Stator Shroud Leakage and Mainstream Flows in Compressors,” ASME Paper 2000-GT-570.
Green, T., 1994, “Effect of External Flow on Sealing Performance of Rotor-Stator Rim Seals,” D.Phil. thesis, University of Sussex, UK.
FLUENT5, 1998. Users Guide, Fluent Inc.
Virr,  G. P., Chew,  J. W., and Coupland,  J., 1993, “Application of Computational Fluid Dynamics to Turbine Disc Cavities,” ASME Paper 93-GT-89; also, ASME J. Turbomach., 116, pp. 701–708.
Cargill, A. M., 1991, “On Non-axisymmetric and Unsteady Effects on Rim Sealing,” Rolls-Royce report.
Hills, N. J., 1996, “Development and Application of Multigrid Methods in CFD for Turbine Rim Sealing,” D.Phil. thesis, University of Sussex, UK.

Figures

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Schematic of Experimental Rig
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Schematic showing guide vanes, pressure tappings, and rotor pegs—(a) pressure tappings in unbroken annulus, (b) positions of vanes and rotor pegs
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Computational domain for model 4
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Convergence of concentration at r/r0=0.41 stator measurement point for unsteady solution
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Comparison of calculated and measured annulus pressures
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Static pressure asymmetry due to vane alone and rotor peg alone
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Comparison of calculated and measured disc cavity pressures
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Comparison of calculated and measured concentration in the cavity
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Contours of instantaneous concentration on the radial plane in the seal gap 1 mm inboard of the inner annulus wall for two rotor peg positions—(a) time point A, (b) time point B
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Instantaneous velocity vector plots (axial-radial plane) at time position A—(a) fraction of NGV pitch=0, (b) fraction of NGV pitch=0.5
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Pressure, radial velocity and concentration in the rim seal gap on the line 0.1 mm from the rotor, and 1 mm radially inboard of the inner annulus wall
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Comparison of simple model with data from Chew et al. 10
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Comparison of simple model with data from the present configuration
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Comparison of measured and calculated cavity pressure
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Calculated mass inflow from simple model for steady conditions with no sealing flow

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