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.
Highlights
西北工业大学学报 Journal of Northwestern Polytechnical University https: / / doi.org / 10.1051 / jnwpu / 20193740751
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 viscos⁃ ity⁃temperature equation were calculated by the computational fluid dynamics method
Summary
西北工业大学学报 Journal of Northwestern Polytechnical University https: / / doi.org / 10.1051 / jnwpu / 20193740751 设置如下: 求在 60 ~ 80 kN 以上。 参考文献[4] 的研究结果表 图 5 给出了不同偏心率下弹性变形对织构滑动 轴承在轴向中间截面的周向油膜温度分布的影响。 可以看出:随着偏心率的增大,考虑弹性变形和不考 虑弹性变形的最大油膜温度均明显升高;对比相同 偏心率下 2 种织构滑动轴承的温度分布,考虑弹性 变形影响的相比不考虑弹性变形的最大油膜温度有 所降低,温度沿着周向分布的变化更加平缓;偏心率 越大,2 种织构滑动轴承的温度差异也越大。 心率较小时,织构滑动轴承的油膜温度小于无织构 滑动轴承;偏心率较大时,织构滑动轴承油膜温度略 大于无织构轴承。 随着偏心率增大,油膜压力升高, 2 种滑动轴承的轴颈最大变形都明显增大,且不同 偏心率下织构滑动轴承轴颈变形都小于无织构滑动 轴承。
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