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Investigation of Flow and Mixing Phenomena in an Oil Supply Pocket of a Heavy Duty Gas Turbine Journal Bearing

[+] Author Affiliations
Stephan Uhkoetter, Stefan aus der Wiesche

University of Applied Sciences Muenster, Steinfurt, Germany

Franz Joos

Helmut-Schmidt-University, Hamburg, Germany

Paper No. GT2013-94364, pp. V07BT30A010; 10 pages
doi:10.1115/GT2013-94364
From:
  • ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
  • Volume 7B: Structures and Dynamics
  • San Antonio, Texas, USA, June 3–7, 2013
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5527-0
  • Copyright © 2013 by ASME

abstract

In recent year, bearing designers have focused on reduced-temperature designs; whereby better results have been achieved by applying the cool inlet oil more effectively and reducing the hot oil carryover. The key factor in this improvement is the hot-cool oil mixing process in the oil supply pockets. However, relatively little is know about the details of the underlying flow and mixing phenomena, and the classical one dimensional lubrication theory fails to provide an explanation. A detail experimental investigation of the flow and mixing phenomena in a typical oil supply pocket of a heavy duty gas turbine was performed by employing a large-scale model of the geometry. This model has a similarity in respect to Reynolds number, and, by using laser Doppler anemometry (LDA), it permitted optical flow visualization and measurements. In addition to a thin shear layer close to the moving boundary, flow patterns including recirculation zones were detected in the larger part of the flow domain. Fully three-dimensional computational fluid dynamics (CFD) simulations were performed, too. With regard to the observed flow and mixing phenomena, large eddy simulation (LES) methods offer great potential because this approach can directly resolve the large eddies, and it is the interaction between the shear layer and these large eddies that mainly govern the mixing phenomena. The comparison between experimental data and LES results showed a reasonable agreement. Furthermore, the potential of more conventional turbulence models such as the classical k-ε-model were also assessed.

Copyright © 2013 by ASME

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