Thermo-Elastohydrodynamic Study on Textured Journal Bearing with High-Speed and High-Specific-Pressure

高速高比压织构滑动轴承热弹流润滑分析

School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China

Received: 13 August 2018

Abstract

The performance of supporting journal bearing of the star gear transmission system in the geared turbo fan engine (GTF) is analyzed. A thermal-elastohydrodynamic analysis model was developed for textured journal bearing used in high-speed and high-specific-pressure conditions. The Navier-Stokes equation, energy equation, and viscosity-temperature equation were calculated by the computational fluid dynamics method. The influence of elastic deformation on bearing thermal hydrodynamic performance was studied in detail. The results indicate that the elastic deformation has an influence on the distribution of oil temperature and oil pressure. Besides, a comparative thermo-elastohydrodynamic analysis was conducted between the textured bearing and the un-textured bearing, and the discrepancies of maximum oil pressure, load carrying capacity and the maximum oil temperature are few. However, the textured bearing has a lower elastic deformation than the un-textured bearing.

摘要

齿轮传动涡扇发动机（geared turbo fan engine，GTF）的星型齿轮传动系统使用滑动轴承作为支承。GTF滑动轴承在高速高比压工况下工作，油膜压力较大，导致轴承会发生弹性变形。考虑滑动轴承的弹性变形以及润滑油温黏效应等的影响，基于计算流体动力学方法建立了高速高比压织构滑动轴承的三维热弹流润滑分析模型，研究了考虑弹性变形影响的织构滑动轴承热流体润滑性能，并对比了织构滑动轴承和无织构滑动轴承的热弹流润滑性能。结果表明：考虑弹性变形的影响后，在相同大偏心率工况下织构滑动轴承的最大油膜压力、承载力和最大油膜温度均会明显降低，周向承载区域明显扩大，且温度和油膜压力在圆周方向上的变化也更加平缓；对比织构滑动轴承和无织构滑动轴承，两者的最大油膜压力、承载力、最大油膜温升和摩擦系数无明显差异，但油膜承载区的弹性变形有明显减小。