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Research Papers: Gas Turbines: Turbomachinery

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 Lane,
Bristol BS16 1QY, UK
e-mail: budi.chandra@uwe.ac.uk

Kathy Simmons

University Technology Centre for
Gas Turbine Transmission Systems,
University of Nottingham,
University Park,
Nottingham NG7 2RD, UK
e-mail: kathy.simmons@nottingham.ac.uk

Andrew Murphy

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

1Corresponding author.

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received May 30, 2017; final manuscript received July 10, 2017; published online October 17, 2017. Assoc. Editor: Klaus Brun.

J. Eng. Gas Turbines Power 140(3), 032601 (Oct 17, 2017) (9 pages) Paper No: GTP-17-1185; doi: 10.1115/1.4037871 History: Received May 30, 2017; Revised July 10, 2017

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.

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References

Chandra, B. , 2006, “ Flows in Turbine Engine Oil Sumps,” Ph.D. thesis, Purdue University, West Lafayette, IN. http://docs.lib.purdue.edu/dissertations/AAI3263555/
Chandra, B. , Collicott, S. H. , and Munson, J. H. , 2013, “ Scavenge Flow in a Bearing Chamber With Tangential Sump Off-Take,” ASME J. Eng. Gas Turbines Power, 135(3), p. 032503.
Chandra, B. , Collicott, S. H. , and Munson, J. H. , 2017, “ Experimental Optimization of Rolls-Royce AE3007 Sump Design,” ASME Paper No. GT2017-64030.
Chandra, B. , Simmons, K. , Pickering, S. , and Tittel, M. , 2010, “ Factors Affecting Oil Removal From an Aeroengine Bearing Chamber,” ASME Paper No. GT2010-22631.
Chandra, B. , Simmons, K. , Pickering, S. , and Tittel, M. , 2011, “ Liquid and Gas Flow Behavior in a Highly Rotating Environment,” ASME Paper No. GT2011-46430.
Chandra, B. , Simmons, K. , Pickering, S. , and Keeler, B. , 2013, “ Parametric Study Into the Effect of Geometric and Operational Factors on the Performance of an Idealized Aeroengine Sump,” International Symposium on Air Breathing Engines, Busan, South Korea, Sept. 9–13, Paper No. ISABE2013-10311.
Chandra, B. , and Simmons, K. , 2013, “ Performance Comparison for Aeroengine-Type Sump Geometries,” ASME Paper No. IMECE2013-62836.
Kurz, W. , Dullenkopf, K. , and Bauer, H.-J. , 2012, “ Influences on the Oil Split Between the Offtakes of an Aero-Engine Bearing Chamber,” ASME Paper No. GT2012-69412.
Zhao, J. , Lyu, Y. , Liu, Z. , and Ren, G. , 2016, “ Numerical Study on the Improvement of Oil Return Structure in Aero-Engine Bearing Chambers,” Int. J. Turbo Jet-Engines, epub. https://doi.org/10.1515/tjj-2016-0022
Chandra, B. , and Simmons, K. , 2016, “ Innovative Shallow Sump Customizations for Aero-Engine Bearing Chambers,” ASME Paper No. GT2016-56107.
Chandra, B. , Simmons, K. , Pickering, S. , Collicott, S. H. , and Wiedemann, N. , 2013, “ Study of Gas/Liquid Behavior Within an Aeroengine Bearing Chamber,” ASME J. Eng. Gas Turbines Power, 135(5), p. 051201.
Kurz, W. , and Bauer, H.-J. , 2014, “ An Approach for Predicting the Flow Regime in an Aero Engine Bearing Chamber,” ASME Paper No. GT2014-26756.
Radocaj, D. J. , 2001, “ Experimental Characterization of a Simple Gas Turbine Engine Sump Geometry,” Master's thesis, Purdue University, West Lafayette, IN.
Chanson, H. , 1994, “ Comparison of Energy Dissipation Between Nappe and Skimming Flow Regimes on Stepped Chutes,” J. Hydraul. Res., 32(2), pp. 213–218. [CrossRef]

Figures

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Fig. 1

Bearing chamber and its sump

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Fig. 2

Optimized shallow sump (a) indicating similarity to AE3007 sump (b) [6]

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Fig. 3

Flow circuit diagram

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Fig. 4

Bearing chamber with breather hole

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Fig. 5

Baseline shallow sump

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Fig. 9

Differential residence volumes with grille covers (wall film flow regime)

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Fig. 10

Differential residence volumes with grille covers (airborne droplets flow regime)

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Fig. 11

Differential residence volumes with stepped spillways (wall film flow regime)

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Fig. 12

Differential residence volumes with stepped spillways (airborne droplets flow regime)

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Fig. 13

Differential residence volumes with perforated plates (wall film flow regime)

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Fig. 14

Differential residence volumes with perforated plates (airborne droplets flow regime)

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