| 제목 |
MULTISCALE ANALYSIS OF HYDRODYNAMIC JOURNAL BEARING CONSIDERING THE EFFECT OF THE PHYSICALLY ADSORBED BOUNDARY LAYER |
| 분야 |
Engine and Emissions |
| 언어 |
English |
| 저자 |
Kaicheng Gu(Changzhou University), Shaojin Shao(Changzhou University), Yongbin Zhang(Changzhou University) |
| Key Words |
Adsorbed layer, Hydrodynamics, Journal bearing, Load, Multiscale, Pressure |
| 초록 |
In itself, there is a very thin boundary layer physically adsorbed to the bearing surface. When the bearing clearance is far larger than the thickness of this layer, the boundary layer effect in the bearing is negligible, and conventional hydrodynamic lubrication theory just addresses on this topic. However, with the worsening of the operating condition, the bearing clearance can be largely reduced and comparable to the thickness of the adsorbed boundary layer. For this case, the effect of the adsorbed boundary layer must be considered. The present paper presents the multiscale analysis for the performance of the hydrodynamic journal bearing in a wide range of bearing clearance considering the effect of the physically adsorbed boundary layer. The calculation results indicate for how low bearing clearances the adsorbed boundary layer effect should be incorporated. When the minimum bearing clearance is on the same scale with the thickness of the adsorbed boundary layer, the hydrodynamic pressure in the bearing is locally largely increased by the effect of the adsorbed boundary layer, and the load-carrying capacity of the bearing is correspondingly largely increased. This is particularly significant for a strong fluid-bearing surface interaction. The study shows the great contribution of the physically adsorbed boundary layer to the performance of the hydrodynamic journal bearing in the condition of low surface clearances, and indicates the necessity of the multiscale analysis for this bearing. |
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