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TECHNICAL PAPERS

Experimental and Theoretical Comparison of Two Swirl Brake Designs

[+] Author and Article Information
K. K. Nielsen, C. M. Myllerup

Machinery Dynamics Group, O̸degaard & Danneskiold-Samso̸e A/S, Copenhagen, Denmark

D. W. Childs

Turbomachinery Laboratory, Mechanical Engineering Department, Texas A&M University, College Station, TX 77843

J. Turbomach 123(2), 353-358 (Feb 01, 2000) (6 pages) doi:10.1115/1.1354140 History: Received February 01, 2000
Copyright © 2001 by ASME
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References

Benchert, H., and Wachter, J., 1980, “Flow Induced Spring Coefficients of Labyrinth Seals for Application in Rotordynamics,” NASA CP2133, Proceedings of the workshop: Rotordynamic Instability Problems in High Performance Turbomachinery, held at Texas A&M University, 12–14 May 1980, pp. 189–212.
Nielsen, K. K., 1997, “Rotordynamic Impact of Swirl Brakes,” Diploma Course Report 1997-28, von Karman Institute for Fluid Dynamics, Rhode-St-Genèse, Belgium.
Nielsen, K. K., Van den Braembussche, R. A., and Myllerup, C. M., 1998, “Optimization of Swirl Brakes by Means of a 3D Navier-Stokes Solver,” ASME Paper No. 98-GT-328.
Nielsen, K. K., Myllerup, C. M., and Van den Braembussche, R. A., 1999, “Parametric Study of the Flow in Swirl Brakes by Means of a 3D Navier-Stokes Solver,” C557/088/99/, Transactions of the Third European Conference on Turbomachinery, pp. 489–498.
Childs,  D. W., and Ramsey,  C., 1990, “Seal-Rotordynamic-Coefficient Test Results for a Model SSME ATD-HPFTP Turbine Interstage Seal With and Without a Swirl Brake,” ASME J. Tribol., 113, pp. 198–203.
Childs,  D. W., Nelson,  C. E., Nicks,  C., Scharrer,  J., Elrod,  D., and Hale,  K., 1986, “Theory Versus Experiment for the Rotordynamic Coefficients of Annular Gas Seals: Part 1—Test Facility and Apparatus,” ASME J. Tribol., 108, pp. 426–432.
Childs,  D. W., Baskharone,  E., and Ramsey,  C., 1991, “Test Results for Rotordynamic Coefficients of the SSME HPOTP Turbine Interstage Seal With Two Swirl Brakes,” ASME J. Tribol., 113, pp. 577–583.
Griffin, M., Kleynhans, G., Alexander, C., Gansle, A., Pierce, T., and Childs, D. W., 1992, “Experimental Rotordynamic Coefficient and Static Characteristic Results for a Model SSME ATD-HPFTP Turbine Interstage Seal With and Without a Non-Aerodynamic Swirl Brake,” TL-SEAL-20-92 #366.
Holman, J. P., 1978, Experimental Methods for Engineers, McGraw-Hill, New York, p. 45.
AEA Technology, 1999, CFX-TASCflow User Documentation, Version 2.9.

Figures

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Both swirl brake designs investigated
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Cross-coupled stiffness variation with inlet swirl ratio for rotor speed of 5000 rpm
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Cross-coupled stiffness variation with inlet swirl ratio for rotor speed of 12000 rpm
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Cross-coupled stiffness variation with inlet swirl ratio for rotor speed of 16000 rpm
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Computational domain with grid surfaces
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Dependence of seal inlet swirl ratio on the number of grid nodes
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Seal inlet swirl ratio variation with swirl brake inlet swirl ratio for rotor speed of 5000 rpm
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Seal inlet swirl ratio variation with swirl brake inlet swirl ratio for rotor speed of 12000 rpm
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Seal inlet swirl ratio variation with swirl brake inlet swirl ratio for rotor speed of 16000 rpm
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Vector field for aerodynamic swirl brake design at 42 percent span from stator. Projected streak line originating from vane leading edge included. Seal inlet at left side of plot.
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Vector field for nonaerodynamic swirl brake design at 42 percent span from stator. Projected streak line originating from vane leading edge included. Seal inlet at left side of plot.
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Rotor to stator vector field for the aerodynamic swirl brake at a pitch of 19 percent from the vane suction side towards the pressure side

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