Experimental research was conducted into a scooped rotor system that captures oil from a stationary jet and directs it through passages within the shaft to another axial location. Such a system has benefits for delivering oil via under-race feed to aeroengine bearings where direct access is limited. Oil capture efficiency was calculated for three jet configurations, a range of geometric variations relative to a baseline and a range of operating conditions. Flow visualization techniques yielded high-speed imaging in the vicinity of the scoop leading edge. Overall capture efficiency depends on the amount of oil initially captured by the scoop that is retained. Observation shows that when the jet hits the tip of a scoop element, it is sliced and deflected upward in a “plume.” Ligaments and drops formed from this plume are not captured. In addition, some oil initially captured is flung outward as a consequence of centrifugal force. Although in principle capture of the entire supply is possible over most of the shaft speed range, as demonstrated by a simplified geometric model, in practice 60–70% is typical. Significant improvement in capture efficiency was obtained with a lower jet angle (more radial) compared to baseline. Higher capture efficiencies were found where the ratio of jet to scoop tip speed was lower. This research confirms the capability of a scoop system to capture and retain delivered oil. Additional numerical and experimental work is recommended to further optimize the geometry and increase the investigated temperature and pressure ranges.
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January 2019
Research-Article
Assessment of the Oil Scoop Capture Efficiency in High Speed Rotors
Paloma Paleo Cageao,
Paloma Paleo Cageao
Faculty of Engineering,
Gas Turbine and Transmissions Research
Centre,
University of Nottingham,
Nottingham NG8 1BB, UK
e-mail: Paloma.Paleo@nottingham.ac.uk
Gas Turbine and Transmissions Research
Centre,
University of Nottingham,
Nottingham NG8 1BB, UK
e-mail: Paloma.Paleo@nottingham.ac.uk
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Kathy Simmons,
Kathy Simmons
Faculty of Engineering,
Gas Turbine and Transmissions Research
Centre,
University of Nottingham,
Nottingham NG8 1BB, UK
e-mail: kathy.simmons@nottingham.ac.uk
Gas Turbine and Transmissions Research
Centre,
University of Nottingham,
Nottingham NG8 1BB, UK
e-mail: kathy.simmons@nottingham.ac.uk
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Arun Prabhakar,
Arun Prabhakar
Faculty of Engineering,
Gas Turbine and Transmissions Research
Centre,
University of Nottingham,
Nottingham NG8 1BB, UK
e-mail: arun.prabhakar@nottingham.ac.uk
Gas Turbine and Transmissions Research
Centre,
University of Nottingham,
Nottingham NG8 1BB, UK
e-mail: arun.prabhakar@nottingham.ac.uk
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Budi Chandra
Budi Chandra
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Paloma Paleo Cageao
Faculty of Engineering,
Gas Turbine and Transmissions Research
Centre,
University of Nottingham,
Nottingham NG8 1BB, UK
e-mail: Paloma.Paleo@nottingham.ac.uk
Gas Turbine and Transmissions Research
Centre,
University of Nottingham,
Nottingham NG8 1BB, UK
e-mail: Paloma.Paleo@nottingham.ac.uk
Kathy Simmons
Faculty of Engineering,
Gas Turbine and Transmissions Research
Centre,
University of Nottingham,
Nottingham NG8 1BB, UK
e-mail: kathy.simmons@nottingham.ac.uk
Gas Turbine and Transmissions Research
Centre,
University of Nottingham,
Nottingham NG8 1BB, UK
e-mail: kathy.simmons@nottingham.ac.uk
Arun Prabhakar
Faculty of Engineering,
Gas Turbine and Transmissions Research
Centre,
University of Nottingham,
Nottingham NG8 1BB, UK
e-mail: arun.prabhakar@nottingham.ac.uk
Gas Turbine and Transmissions Research
Centre,
University of Nottingham,
Nottingham NG8 1BB, UK
e-mail: arun.prabhakar@nottingham.ac.uk
Budi Chandra
1Corresponding author.
Contributed by the Oil and Gas Applications Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received May 12, 2017; final manuscript received September 21, 2017; published online October 29, 2018. Editor: Jerzy T. Sawicki.
J. Eng. Gas Turbines Power. Jan 2019, 141(1): 012401 (12 pages)
Published Online: October 29, 2018
Article history
Received:
May 12, 2017
Revised:
September 21, 2017
Citation
Paleo Cageao, P., Simmons, K., Prabhakar, A., and Chandra, B. (October 29, 2018). "Assessment of the Oil Scoop Capture Efficiency in High Speed Rotors." ASME. J. Eng. Gas Turbines Power. January 2019; 141(1): 012401. https://doi.org/10.1115/1.4040812
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