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research-article

Mechanisms for Residence Volume Reduction in Shallow Sump

[+] Author and Article Information
Budi Chandra

Engineering Design and Mathematics, University of the West of England, Coldharbour Ln, Bristol, BS16 1QY, United Kingdom
budi.chandra@uwe.ac.uk

Kathy Simmons

University Technology Centre for Gas Turbine Transmission Systems, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
kathy.simmons@nottingham.ac.uk

Andrew Murphy

Ricardo UK Ltd, Shoreham Technical Centre, Shoreham-by-Sea, West Sussex, BN43 5FG, United Kingdom
andrew.murphy@ricardo.com

1Corresponding author.

ASME doi:10.1115/1.4037871 History: Received May 30, 2017; Revised July 10, 2017

Abstract

Gas turbine aero-engines employ fast rotating shafts that are supported by bearings at several axial locations along the engine. Due to extreme load and heat, oil is injected to the bearings to aid lubrication and cooling. The oil is then shed to the bearing chamber before it is extracted out by a scavenge pump. Scavenging oil from the bearing chamber is challenging due to high windage induced by the fast rotating shafts as well as the two-phase nature of the flow. A deep sump has been found to increase scavenge performance due to its ability to shelter the pooled oil from the bulk rotating air flow thus minimizing two-phase mixing. However in many cases, a deep sump is not an option due to conflicting space requirements. The space limitation becomes more stringent with higher bypass ratio engines as the core becomes smaller. Therefore it is imperative to have a high performing shallow sump. However shape modification of a shallow sump is too constrained due to limited space and therefore has minimal impact on the scavenge performance. This research presents several alternative concepts to improve scavenge performance of a generic baseline shallow sump by augmenting it with attachments or inserts. These augmentations attempt to exploit two known mechanisms for reducing the residence volume: momentum reduction and sheltering. The experimental results show that some augmentations are able to reduce the residence volume of a shallow sump by up to 50% or more in some cases.

Copyright (c) 2017 by ASME
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