Research Papers: Gas Turbines: Structures and Dynamics

Scavenge Flow in a Bearing Chamber With Tangential Sump Off-Take

[+] Author and Article Information
Budi Chandra

University Technology Centre for Gas Turbine,
Transmission Systems,
University of Nottingham,
University Park,
Nottingham, NG7 2RD, UK

Steven H. Collicott

School of Aeronautics and Astronautics,
Purdue University,
West Lafayette, IN 47907-2045

John H. Munson

Rolls-Royce Corporation,
Indianapolis, IN 46206

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received August 15, 2012; final manuscript received October 8, 2012; published online February 21, 2013. Editor: Dilip R. Ballal.

J. Eng. Gas Turbines Power 135(3), 032503 (Feb 21, 2013) (9 pages) Paper No: GTP-12-1332; doi: 10.1115/1.4007869 History: Received August 15, 2012; Revised October 08, 2012

A tangential sump design is employed in several aero-engines mainly due to its simplicity and compactness. However various problems have prompted investigations of the sump design. An experimental program at Purdue University (Chandra, 2006, “Flows in Turbine Engine Oil Sumps,” Ph.D. thesis, School of Aeronautics and Astronautics, Purdue University and Radocaj, 2001, “Experimental Characterization of a Simple Gas Turbine Engine Sump Geometry,” M.S. thesis, School of Aeronautics and Astronautics, Purdue University) was conducted to investigate the characteristics of a tangential sump design like one used in the AE3007 aero-engine. The research employed a transparent chamber to allow unprecedented view of the flow inside the bearing chamber. It was quickly found that a persistent liquid pooling near the drain entrance of a tangential sump obstructs the outflow to the scavenge pump. The air flow near the drain entrance has been shown to have strong reverse flow, even with, or perhaps due to, substantial over-scavenging. Various modifications were tested with varying degrees of success. The work highlights limitations of a tangential sump design. Based on the lessons learned, a new sump design was proposed. Preliminary test of the new sump design has shown positive results.

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Fig. 1

Axial diagram of gas turbine bearing chamber

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Fig. 2

Center sump of Rolls-Royce AE3007 engine

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Fig. 3

Bearing chamber with a tangential off-take sump

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Fig. 4

Schematic of the closed-loop experimental rig

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Fig. 5

The sump construction consisting of a center plate and two endplates

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Fig. 6

Shaft and seal runner location in the chamber

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Fig. 7

Injector assembly and placement

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Fig. 8

Flow patterns of tangential off-take sump (Ql = 0.3 gpm, gravity drain)

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Fig. 9

Typical streamlines around a sharp and a rounded sump lip [12]

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Fig. 10

Rounded drain lip attachment

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Fig. 11

A sample case of an oil smearing experiment

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Fig. 12

Computational result for streamlines around the drain entrance [12]

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Fig. 13

A sample case of flow visualization using tufts

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Fig. 14

Vortices on boundary layers of sump walls

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Fig. 15

Streamlines of undersized, matched, and oversized sump [12]

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Fig. 16

Lip attachments with various effective sump heights

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Fig. 17

Schematic of the experimental rig with three solenoid valves for residence volume measurements

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Fig. 18

Residence volume for sump height of 0.25 inches

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Fig. 19

Residence volume for sump height of 0.20 inches

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Fig. 20

Residence volume for sump height of 0.15 inches

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Fig. 21

Residence volume for sump height of 0.10 inches

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Fig. 22

Residence volume for sump height of 0.05 inches

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Fig. 23

A new center plate for the advanced sump design (shaft rotation is anti-clockwise)

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Fig. 24

Advanced sump at oil flow rate, Ql, of 0.3 gpm and SR ≈ 2

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Fig. 25

Residence volume comparison between the original and advanced Indy sump (AE3007)




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