Experimental Investigation Into Oil Shedding From a Rotating Cup Geometry

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

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, June). Experimental Investigation Into Oil Shedding From a Rotating Cup Geometry. Presented at ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition, Rotterdam, Netherlands

• Presentation Conference Type: Edited Proceedings
• Conference Name: ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition
• 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.