Numerical investigations on drag coefficient of circular cylinder with two free ends in roller bearings

Wenjun Gao, Daniel Nelias, Yaguo Lyu, Nicolas Boisson

科研成果: 期刊稿件文章同行评审

43 引用 (Scopus)

摘要

In high speed roller bearings, the drag force due to the oil-air mixture present in the bearing cavity – that is acting against the roller movement – is usually computed with a two-dimensional model of flow around a cylinder of infinite length. However rollers are of finite length, and the flow is perturbed by the two free ends, the surrounding rings, the cage and other rolling elements. In this article, the Computational Fluid Dynamics (CFD) method is employed to analyze first the flow around one finite-length circular cylinder with two free ends in an open space. Then the model is changed to one finite cylinder and then several in-line circular cylinders sandwiched by two flat walls, which represents a simplified approach. The results indicate that both the flow pattern around the cylinder and its drag coefficient are modified in comparison with the two-dimensional model. Finally a relationship between the drag coefficient and the Reynolds number suitable for circular cylinder in roller bearings is proposed.

源语言英语
页(从-至)43-49
页数7
期刊Tribology International
123
DOI
出版状态已出版 - 7月 2018

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