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TECHNICAL PAPERS: Gas Turbines: Heat Transfer and Turbomachinery

Droplet Generation by Disintegration of Oil Films at the Rim of a Rotating Disk

[+] Author and Article Information
A. Glahn

United Technologies Research Center, 411 Silver Lane, M/S 129-19, East Hartford, CT 06108

S. Busam

Institut für Thermische Strömungsmaschinen, Universität Karlsruhe, Kaiserstr. 12, Baden-Württemberg 76128 Karlsruhe, Germany

M. F. Blair

United Technologies Research Center, 411 Silver Lane, M/S 129-19 East Hartford, CT 06108

K. L. Allard

Pratt & Whitney, 400 Main Street, M/S 163–09, East Hartford, CT 06108

S. Wittig

Institut für Thermische Strömungsmaschinen, Universität Karlsruhe, Kaiserstr. 12, Baden-Württemberg, 76128 Karlsruhe, Germany

J. Eng. Gas Turbines Power 124(1), 117-124 (Feb 01, 2000) (8 pages) doi:10.1115/1.1400753 History: Received November 01, 1999; Revised February 01, 2000
Copyright © 2002 by ASME
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References

Zimmermann, H., Kammerer, A., Fischer, R., and Rebhahn, D., 1991, “Two-Phase Flow Correlations in Air/Oil Systems of Aero Engines,” ASME Paper 91-GT-54.
Wittig,  S., Glahn,  A., and Himmelsbach,  J., 1994, “Influence of High Rotational Speeds on Heat Transfer and Oil Film Thickness in Aero Engine Bearing Chambers,” ASME J. Eng. Gas Turbines Power, 116, pp. 395–401.
Chew, J., 1996, “Analysis of the Oil Film on the Inside Surface of an Aero-Engine Bearing Chamber Housing,” ASME Paper 96-GT-300.
Glahn,  A., and Wittig,  S., 1996, “Two-Phase Air Oil Flow in Aero Engine Bearing Chambers—Characterization of Oil Film Flows,” ASME J. Eng. Gas Turbines Power, 118, pp. 578–583.
Glahn, A., Busam, S., and Wittig, S., 1997, “Local and Mean Heat Transfer Coefficients along the Internal Housing Walls of Aero Engine Bearing Chambers,” ASME Paper 97-GT-261.
Busam,  S., Glahn,  A., and Wittig,  S., 2000, “Internal Bearing Chamber Wall Heat Transfer as a Function of Operating Conditions and Chamber Geometry,” ASME J. Eng. Gas Turbines Power, 122, 314–320.
Glahn,  A., and Wittig,  S., 1999, “Two-Phase Air Oil Flow in Aero Engine Bearing Chambers—Assessment of an Analytical Prediction Method for the Internal Wall Heat Transfer,” Int. J. Rotating Mach, 5, No. 3, pp. 155–165.
Zaidi, S. H., Ishaq G., Aroussi A., and Azzopardi, B. J., 1998, “Two-Phase Flow Study Around a Rotating Liquid Film Using Laser Techniques,” Proceedings of the VSJ-SPIE98, Dec. 6–9, Yokohama, Japan.
Glahn,  A., Kurreck,  M., Willmann,  M., and Wittig,  S., 1996, “Feasibility Study on Oil Droplet Flow Investigations inside Aero Engine Bearing Chambers—PDPA Techniques in Combination with Numerical Approaches,” ASME J. Eng. Gas Turbines Power, 118, pp. 749–755.
Lefebvre, A. H., 1989, Atomization and Sprays, Hemisphere, Washington, DC.
Matsumoto, S., Belcher D. W., and Crosby, E. J., 1985, “Rotary Atomizers: Performance Understanding and Prediction,” Proceedings of the 3rd International Conference on Liquid Atomization and Spray Systems (ICLASS-85), London.
Hinze,  J. O., and Milborn,  H., 1950, “Atomization of Liquids by Means of a Rotating Cup,” ASME J. Appl. Mech., 17, Paper 49-SA-2, pp. 145–153.
Bachalo,  W. D., and Houser,  M. J., 1984, “Phase Doppler Spray Analyzer for Simultaneous Measurements of Drop Size and Velocity Distributions,” Opt. Eng., 23, pp. 583–590.
Willmann,  M., Glahn,  A., and Wittig,  S., 1997, “Phase-Doppler Particle Sizing with Off-Axis Angles in Alexander’s Darkband,” Part. Part. Syst. Charact., 14, No. 3, pp. 122–128.
Tanasawa, Y., Miyasaka, Y., and Umehara, M., 1978, “Effect of Shape of Rotating Disks and Cup on Liquid Atomization,” Proceedings of the 1st International Conference on Liquid Atomization and Spray Systems. Tokyo, pp. 165–172.

Figures

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Droplet disintegration modes; (a) direct drop formation, (b) ligament formation, (c) film formation
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Droplet disintegration map
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Radial droplet diameter distribution (q=2.87.10−5 m3/s,z=0 m,ω=523.6 s−1,T=295 K)
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Characteristic diameters and velocities versus rotational speed (ΔR=25.10−3 m,z=0 m,q=2.872.10−5 m3/s,T=295 K)
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Characteristic diameters versus oil flow rate (ΔR=25⋅10−3 m,z=0 m,ω=523.6 s−1,T=295 K)
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Sauter mean diameter (SMD) versus nondimensional rim speed at different oil flow rates
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Axial droplet diameter distribution (ΔR=25⋅10−3 m,ω=523.6 s−1,q=2.897⋅10−5 m3/s,T=343 K)
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Radial droplet diameter distribution (q=2.87⋅10−5 m3/s,z=0 m,ω=523.6 s−1,T=295 K)
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Droplet flow vector versus operating conditions (q=2.24⋅10−5 to 3.33⋅10−5 m3/s,ΔR=25⋅10−3 m,z=0 m,T=295 K)
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Droplet trajectories (q=2.87⋅10−5 m3/s,z=0 m,ω=523.6 s−1,T=295 K)

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