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Film Flow Around Bearing Chamber Support Structures

[+] Author Affiliations
Carol Eastwick, Barry Azzopardi, Kathy Simmons, Richard Morrison

University of Nottingham, Nottingham, UK

Keno Huebner

University of Karlsruhe, Karlsruhe, Germany

Colin Young

Rolls-Royce plc, Derby, UK

Paper No. GT2005-68905, pp. 1267-1272; 6 pages
doi:10.1115/GT2005-68905
From:
  • ASME Turbo Expo 2005: Power for Land, Sea, and Air
  • Volume 3: Turbo Expo 2005, Parts A and B
  • Reno, Nevada, USA, June 6–9, 2005
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4726-8 | eISBN: 0-7918-3754-8
  • Copyright © 2005 by ASME

abstract

Cooling of aero-engine bearing chamber walls is achieved by the through-flow of thin oil films, which are typically only a few millimeters thick. Support structures and other features disrupt both air and oil motion within such chambers, leading to localized variations in the oil film thickness, causing variation in local heat transfer coefficients. An experimental study has been undertaken to establish the range of conditions under which dry-out occurs upstream and downstream of an obstruction. In addition film thickness measurements around the obstruction have been taken at a set air flow rate for four different liquid flow rates. A regime map of liquid vs. air Reynolds numbers has been created showing where stable and fluctuating type I and II dry-outs occur.

Copyright © 2005 by ASME
Topics: Bearings , Film flow

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