A 3D CFD simulation of oil spray-collection and delivery process in an aeroengine inter-shaft bearing  

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

机构地区：[1]School of Mechanical Engineering,Northwestern Polytechnical University,Xi'an 710072,China [2]China Gas Turbine Establishment,Chengdu 610500,China

出　　处：《Chinese Journal of Aeronautics》2022年第9期366-378,共13页中国航空学报（英文版）

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)。

摘　　要：Under-race lubrication applied to the inter-shaft bearing of aeroengine is characterized by spray oil collection and oil delivery to the bearing via flow-path structure. Droplet splashing induced by the collision between spray oil and the scoop as well as oil flowing characteristics in the flow-path influence bearing lubrication efficiency. In previous investigations, the spray oil collection and oil delivery analysis were separated, and the effect of droplet splashing on bearing lubrication efficiency was not considered. Moreover, time-varying characteristics of oil delivered to the bearing were not accounted for. This is caused by time variations of the circumferential position of rollers and under-race feed holes. To overcome these limitations, a numerical model which integrates the spray oil collection and oil delivery analysis is proposed in this paper. The model is embedded with the function of calculating the flow rate of splashing droplets and analyzing time-varying characteristics of the oil fed to the bearing. Furthermore, the numerical model is validated by experimental investigation. The proposed numerical model facilitates the accurate calculation of bearing lubrication efficiency as well as the design of an efficient lubrication structure.

关 键 词：Integrated Inter-shaft bearing Splash-spray TIME-VARYING Under-race lubrication 

分 类 号：V233.4[航空宇航科学与技术—航空宇航推进理论与工程]