径向滑动轴承润滑油膜流动-传热过程仿真

doi:10.13229/j.cnki.jdxbgxb20170171

摘要/Abstract

摘要： 针对润滑油膜进行计算流体力学(CFD)分析时,空化模型的选取对计算结果有非常显著的影响。本文引入全空化模型,完善了基于CFD的动压润滑数值仿真方法,对比了不同空化现象处理方法对于压力和温度分布计算结果的影响。此外,还比较了不同方法在求解流动传热问题中的适用性和精度差异,进一步验证了CFD方法在求解此类问题时的优势。结果表明:引入全空化模型的CFD方法可将最大压力计算结果精度提升12.1%,压力和温度的整体分布也与试验值更接近;且温度分布计算结果更符合实际;在模拟气穴溃灭过程中,现有全空化模型在计算气穴区域温度分布时仍有改进空间。

关键词: 动力机械及工程, 工程热物理, 径向滑动轴承, 计算流体力学, 空化现象, 相变传热

Abstract: In the simulation of hydrodynamics lubrication using CFD based methods, cavitation model has remarkable influence on the simulation results. In this paper, a full-cavitation model is introduced to improve the current CFD based methods. The influences of different cavitation treatment methods on the distributions of pressure and temperature are studied. Further, the applicability and accuracy between Reynolds and CFD based methods are compared. The results show that the accuracy of the maximum pressure is improved up to 12.1%, and the overall pressure distribution is also more close to the experimental data. The temperature distribution with the full-cavitation model is more realistic. However, in modeling the bubble collapsing process, the current full-cavitation model needs to be improved when calculating the temperature distribution in the cavitation area.

Key words: power mechinery and engineering, engineering thermophysics, journal bearing, computational fluid dynamics(CFD), cavitation, phase change and heat transfer

中图分类号:

TK414

孙正, 黄钰期, 俞小莉. 径向滑动轴承润滑油膜流动-传热过程仿真[J]. 吉林大学学报(工学版), 2018, 48(3): 744-751.

SUN Zheng, HUANG Yu-qi, YU Xiao-li. Numerical simulation of flow and heat transfer in journal bearing lubrication[J]. 吉林大学学报(工学版), 2018, 48(3): 744-751.

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