基于两相流的径向滑动轴承界面滑移分析

Analysis of Interface Slip of Journal Bearing Based on Two-Phase Theory

考虑空穴效应和轴瓦界面滑移效应,运用Fluent建立滑动轴承两相流模型,研究不同滑移区域、转速和黏度对油膜承载力及气穴分布的影响规律。研究表明:复合滑移表面比完全滑移和无滑移表面更能提高油膜压力和承载力,同时复合滑移表面能降低高体积分数空穴比例;转速增加能提高油膜压力和承载力,但油膜的高体积分数空穴比例会增加;黏度增加虽然能增加轴承承载力,但同时也加剧了发散楔区域的空化现象,使油膜稳定性下降。

Considering the cavitation effect and the interface slip of the inner wall surface of the bearing,a two-phase flow model of the sliding bearing was established with Fluent to study the influence of different slip areas,rotational speed and viscosity on the oil film bearing capacity and cavitation distribution.The results show that the compound sliding surface can improve the oil film pressure and bearing capacity better than the fully slipped and non-slip surface,and it also can reduce the proportion of high air volume fraction cavities.The increase of the rotation speed can increase the oil film pressure and bearing capacity,but the proportion of voids in the high volume fraction of the oil film will increase.Although the increase in viscosity can increase the bearing capacity of the bearing,it also aggravates the cavitation phenomenon in the divergent wedge region and decreases the stability of the oil film.