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TECHNICAL PAPERS: Gas Turbines: Heat Transfer and Turbomachinery

Interaction of Rim Seal and Annulus Flows in an Axial Flow Turbine

[+] Author and Article Information
C. Cao, J. W. Chew

Fluids Research Center, School of Engineering, University of Surrey, Guildford, Surrey GU2 7XH, UK

P. R. Millington, S. I. Hogg

Alstom Power, Newbold Road, Rugby, Warwickshire CV21 3NH, UK

J. Eng. Gas Turbines Power 126(4), 786-793 (Nov 24, 2004) (8 pages) doi:10.1115/1.1772408 History: Received October 01, 2002; Revised March 01, 2003; Online November 24, 2004
Copyright © 2004 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.
Campbell, D. A., 1978, “Gas Turbine Disc Sealing System Design,” Proc. AGARD conf. On Seal technology in Gas Turbine Engines, AGARD-CP-237.
Bohn, D., Rudzinsky, B., Surken, 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.
Roy, R. P., Xu, G., Feng, J., and Kang, S., 2001, “Pressure Field and Main Stream Gas Ingestion in a Rotor Stator Disc Cavity,” ASME Paper 2001-GT-564.
Hills,  N. J., Chew,  J. W., and Turner,  A. B., 2002, “Computational and Mathematical Modelling of Turbine Rim Seal Ingestion,” ASME J. Turbomach., 124, pp. 306–315.
Gentilhomme, O., Hills, N. J., Chew, J. W., and Turner, A. B., 2002, “Measurement and Analysis of Ingestion Through a Turbine Rim Seal,” ASME Paper GT-2002-30481.
Smout, P. D., Chew, J. W., and Childs, P. R. N., 2002, “ICAS-GT: A European Collaborative Program on Internal Cooling Air Systems for Gas Turbines,” ASME Paper GT-2002-30479.
Bohn, D., Decker, A., and Wolff, M., 2003, “Influence of Sealing Air Mass Flow on the Unsteady Hot Gas Ingestion in the Upstream Cavity of a 1.5 Stage Turbine,” proposed for ASME Turbo Expo.
Autef, V., 2002, “Computation of Disc Cavity Rim Sealing,” University of Surrey/Institut National Polytechnique de Grenoble project report.
Chew, J. W., Hills, N. J., Hornsby, C., and Young, C., 2003, “Recent Developments in Application of CFD to Turbomachinery Internal Air Systems,” submitted to the 5th European Turbomachinery Conf., Prague, March.
Fluent Inc. http://www.fluent.com.
Chen, J.-X., 2001, Alstom internal report, Whetstone, UK.

Figures

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Schematic of the two-stage turbine rig
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Detail of the stage-two disk/diaphragm space
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Pressure transducer installation
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Coarse mesh for the axisymmetric study
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Mesh 1: 4 mm axial gap on a 90 deg sector
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Mesh 3: 4 mm axial gap with balance holes on a 90 deg sector
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Axisymmetric CFD results and measurements for the cavity pressure
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Axisymmetric CFD flow streamlines for the fine mesh without balance hole flow
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Three-dimensional unsteady CFD results and measurements for the mean cavity pressure
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Instantaneous radial velocities and pressure for the 4-mm gap, axisymmetric mesh, 360 deg model
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Instantaneous pressure for (a) the 4-mm gap, axisymemtric mesh, 90 deg model and (b) the 4-mm gap, four balance holes, 360 deg model
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Instantaneous radial velocities and pressure for the 2-mm gap, axisymmetric mesh, 360 deg model
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Typical time trace for the filtered signal from the “root 2” transducer
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Fourier analysis of results from “root 2” transducer from a run with varying rotor speed
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Variation of intensity of frequency with time for the “root 2” transducer
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Typical static pressure history (in the rotating frame) for the 360 deg, 4-mm gap model without balance holes
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Typical static pressure history (in the rotating frame) for the 360 deg, 2-mm gap model without balance holes

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