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Experimental investigation into the performance of shallow aeroengine off-takes

Simmons, Kathy; Chandra, Budi


Kathy Simmons

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Budi Chandra
Associate Director (Mobility Technologies)


Copyright © 2014 by Rolls-Royce plc. Oil removal (scavenge) from aeroengine bearing chambers is an ongoing challenge for aeroengine designers. Effective scavenging of oil is necessary to avoid excessive heat generation, degradation of oil properties and deterioration in heat transfer functionality. However the task of oil removal is not trivial. Oil is entrained in a highly rotating environment induced by the rotating shafts. Simply removing a larger volume of fluid from the chamber with the scavenge pump can create higher air flowrates but lead to oil becoming trapped in the chamber and so no reduction in residence volume (the amount of oil present in the chamber during operation). The University of Nottingham Technology Centre in Gas Turbine Transmissions Systems has been conducting experiments investigating two phase behaviour within a simplified aeroengine bearing chamber operating at ambient pressures with water as the working liquid. The rig is constructed from polycarbonate enabling good visual access. In the chamber offtake region a number of behaviours can be observed relating to the hydraulic uplift and general flow behaviour as gas and liquid exit the chamber. Chandra et al [1]reports a parametric study using a design of experiments approach into geometrical variants of a shallow offtake region defined by curved approaches and a small offtake volume. Phenomenlogical factors were quantified and used to identify the best performing geometry. Previous work at the UTC [2, 3] has used residence volume as the primary comparative performance parameter. In this paper residence volume data is obtained for two sumps for which phenomenological data exists. The paper compares performance on the basis of these visual factors with performance on the basis of residence volume and concludes that although both frameworks have value, they do not lead to identical conclusions for all operating conditions. In film dominated cases significant hydraulic uplift usually corresponds to larger residence volume but for droplet dominated cases this is not necessarily so.


Simmons, K., & Chandra, B. (2014). Experimental investigation into the performance of shallow aeroengine off-takes. In Volume 5C: Heat Transfer. , (V05CT16A022).

Conference Name Proceedings of the ASME Turbo Expo
Conference Location Düsseldorf, Germany
Start Date Jun 16, 2014
End Date Jun 20, 2014
Acceptance Date Jun 16, 2014
Publication Date Jan 1, 2014
Peer Reviewed Peer Reviewed
Volume 5C
Pages V05CT16A022
Book Title Volume 5C: Heat Transfer
ISBN 9780791845738
Keywords scavenge, bearing chamber, gas turbine, multiphase flow
Public URL
Publisher URL
Additional Information Title of Conference or Conference Proceedings : ASME Turbo Expo 2014: Turbine Technical Conference and Exposition - Volume 5C: Heat Transfer