Analysis of oil shedding and ligaments formation on bearing rotary elements

作     者：Donglei ZHU Guoding CHEN Yanjun LI Chaoyang ZHANG Lin WANG Donglei ZHU;Guoding CHEN;Yanjun LI;Chaoyang ZHANG;Lin WANG

作者机构：School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China China Gas Turbine EstablishmentChengdu 610500China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2023年第36卷第2期

页      面：377-387页

核心收录：

学科分类：08[工学] 080103[工学-流体力学] 0825[工学-航空宇航科学与技术] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Science and Technology Major Project(No.J2019-Ⅲ-0023-0067) the National Natural Science Foundation of China(No.51975475) the Fundamental Research funds for the Central Universities(No.31020200503002)。 

主　　题：Aeroengine bearing chamber Ligaments Lubrication Mechanical analysis Shedding Wave 

摘      要：For designing efficient lubrication system of an aeroengine bearing chamber,sufficient knowledge on oil/air two-phase flow characteristics is required.When analyzing bearing chamber two-phase flow,the essential prerequisite is quantifying the oil ligaments,which are detached from bearing rotary elements and shed into the bearing chamber.Related investigations are mainly targeted at liquid shedding on the rotating disk as opposed to the bearing rotary elements.Moreover,the research based on bearing rotary elements is conducted by experiment.Due to the limited operating conditions,experimental studies cannot guide engineering applications.To overcome these limitations,a theoretical model is established in this paper,for revealing the mechanism of oil shedding from bearing rotary elements and quantifying the shedding ligaments.The theoretical model is validated against experimental results from classical studies.In addition,the correlation for shedding ligaments number based on aeroengine bearing structural and operational parameters is obtained via theoretical analysis.The analytical results demonstrate that oil shedding and ligaments formation appear at the edge of bearing inner race outer-periphery.The number of shedding ligaments increases with the rise of shaft rotational speed while decreases with the growth of oil viscosity.