Affiliation:
1. G2TRC, The University of Nottingham, Nottingham NG7 2RD, UK
Abstract
Abstract
Within aeroengines, bearing chambers exhibit a highly complex two-phase environment as a result of the complex air/oil interactions. The desire to operate at both higher temperatures and shaft speeds requires a sufficient understanding of these systems for design optimization. Typically, bearings are used to support the radial and axial loads transmitted by the shafts and require oil for lubrication and cooling. These bearings are housed in bearing chambers that are sealed using airblown seals. Efficient scavenging systems ensure that the oil is collected and returned to the tank avoiding any unnecessary working of the oil. Previous work at the Gas Turbine and Transmissions Research Center (G2TRC) has highlighted the need for an adequate computational model which can appropriately model the oil shedding behavior from such bearings. Oil can breakup forming droplets and ligaments, subsequently forming thin and thick films driven by both gravity and shear. The objective of this paper is to explore the modeling capability of fully two-way coupled Eulerian thin film/discrete phase models (ETFM-DPM) applied to our simplified bearing chamber configuration. The models are created using openfoam and two-way coupling is employed, enabling Lagrangian droplets to either impinge on the film surface or be removed through effects such as film stripping, splashing, or edge separation. This paper focuses on the droplets, presenting statistics relating to size, velocity, impingement, and residence time, and provides insight into solution sensitivity to operational parameters including shaft speed and oil flow rate. This extends upon our previously published work and improves bearing chamber modeling capability.
Funder
Cleansky
Engineering and Physical Sciences Research Council
Rolls-Royce
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering
Reference26 articles.
1. Two-Phase Air/Oil Flow in Aero Engine Bearing Chambers: Characterization of Oil Film Flows;ASME J. Eng. Gas Turbines Power,1996
2. Simulation of a Simplified Aeroengine Bearing Using a Fully Coupled Two-Way Eulerian Thin Film/Discrete Phase Approach Part I: Film Behaviour Near The Bearing;ASME J. Eng. Gas Turbines Power,2021
3. Experimental Investigation of Oil Shedding From an Aero-Engine Ball Bearing at Moderate Speeds,2017
4. Oil Film Thickness Measurements on Surfaces Close to an Aero-Engine Ball Bearing Using Optical Techniques,2017
5. An Experimental Study on Droplet Generation in Bearing Chambers Caused by Roller Bearings,2008
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献