Inner ring oil flow and lubrication efficiency analysis of intershaft bearing

ZHU Donglei; CHEN Guoding; LI Yanjun; ZHANG Chaoyang

doi:10.7527/S1000-6893.2019.23022

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2019 , Vol. 40 >Issue 11: 423022 - 423022

DOI: https://doi.org/10.7527/S1000-6893.2019.23022

Material Engineering and Mechanical Manufacturing

Inner ring oil flow and lubrication efficiency analysis of intershaft bearing

ZHU Donglei ,
CHEN Guoding ,
LI Yanjun ,
ZHANG Chaoyang

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1. School of Mechnical Engineering, Northwestern Polytechnical University, Xi'an 710072, China;
2. China Gas Turbine Establishment, Chengdu 610500, China

Received date: 2019-03-21

Revised date: 2019-04-18

Online published: 2019-06-06

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Abstract

Inner ring oil flow lubrication is applied to principal bearing (intershaft bearing) of aero-engine. The oil-flow characteristics have an influence on lubrication efficiency of bearing. Previous studies have not considered the effect of time-varying oil outlet induced by positional variation between inner ring holes and rollers, and the oil spray-collection analysis is separated from oil flow analysis. To overcome the limitations above, this paper proposes an analytical method considering the effect of time-varying oil outlet, which integrates oil spray-collection and oil flow analysis. Firstly, the oil entering the inner ring tube is decomposed into the oil directly sprayed into tube as well as the oil deposited onto the solid wall and then flowing into the collection holes. By virtue of calculating those two parts of oil flow rates, flow rates of oil entering inner ring tube is obtained. Secondly, time-varying boundary conditions of inner ring holes are determined by positional variation rules of holes and rollers, and are then embedded into transient oil-flow analytical model that could be utilized to obtain the flow rates of each outlet and bearing lubrication efficiency. The proposed oil-flow analytical method is systematic and better qualified for engineering, providing technical method and basic data for the accurate calculation of lubrication efficiency and contributing to the precise design of the intershaft bearing lubrication system.

Key words： aeroengine; intershaft bearing; inner ring lubrication; catch efficiency; bearing lubrication efficiency; time varying characteristic; integration analysis

Cite this article

ZHU Donglei , CHEN Guoding , LI Yanjun , ZHANG Chaoyang . Inner ring oil flow and lubrication efficiency analysis of intershaft bearing[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019 , 40(11) : 423022 -423022 . DOI: 10.7527/S1000-6893.2019.23022

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