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Experimental Investigation Into Oil Shedding From a Rotating Cup Geometry

Cageao, Paloma Paleo; Johnson, Kathy; Ambrose, Stephen; Omar, Rajab

Authors

KATHY JOHNSON KATHY.JOHNSON@NOTTINGHAM.AC.UK
Professor of Mechanical and Aerospace Engineering



Abstract

Oil shedding from rotating components and static elements within rotating systems has a number of applications within the design and understanding of transmission systems as well as wider industrial applications. There is a reasonable body of prior research on liquid ejection from rotating cups and discs where the cup/disc element is on the end of the rotative. This study reports results from an experimental investigation where a cup element was mounted onto a relatively large diameter shaft with the shaft extending through the cup. The primary aim of the study was to investigate and characterise the shedding behaviour over a range of shaft speeds and oil supply rates. High speed images were acquired of shedding from the cup at 90° and 270° from top dead centre (clockwise rotation). Three disintegration modes are observed: droplet, ligament and sheet with transition dependent on operating condition. Transition boundaries on non-dimensional regime maps are compared to published literature showing a good match to data for a spinning disc. In some industrial configurations of interest oil sheds from a rotating component/element onto a static surface prior to subsequent ejection into a chamber or housing. In such cases the tangential component of velocity of the shedding oil is significantly reduced. This current work explores the effect on oil disintegration and shedding when a static element is introduced into the system. The flow behaviour of the air-oil interface at the edge of the static and on the front face of the static element was recorded as part of the investigation and showed a range of flow patterns including stratified smooth film, stratified wavy film with some droplet shedding and turbulent film with significant droplet shedding.

Citation

Cageao, P. P., Johnson, K., Ambrose, S., & Omar, R. (2022). Experimental Investigation Into Oil Shedding From a Rotating Cup Geometry. In Proceedings of the ASME 2022 Turbomachinery Technical Conference & Exposition Turbo Expo 2022 June 13-17, 2022, Rotterdam, The Netherlands. https://doi.org/10.1115/GT2022-82195

Conference Name ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition
Conference Location Rotterdam, Netherlands
Start Date Jun 13, 2022
End Date Jun 17, 2022
Acceptance Date Mar 15, 2022
Online Publication Date Oct 28, 2022
Publication Date Jun 13, 2022
Deposit Date Apr 9, 2022
Publisher American Society of Mechanical Engineers
Volume 8-A
Book Title Proceedings of the ASME 2022 Turbomachinery Technical Conference & Exposition Turbo Expo 2022 June 13-17, 2022, Rotterdam, The Netherlands
ISBN 9780791886069
DOI https://doi.org/10.1115/GT2022-82195
Public URL https://nottingham-repository.worktribe.com/output/7733321
Publisher URL https://asmedigitalcollection.asme.org/GT/proceedings-abstract/GT2022/86069/V08AT22A010/1149104
Related Public URLs https://asme-turboexpo.secure-platform.com/a
Additional Information The authors would like to thank Rolls-Royce plc and Innovate UK for their support of the COAST project, which part funded the research rig and supported the data analysis.