Influence of Surface Geometry on the Hydrodynamic Performances of Parallel Bearings in Transient Flow Conditions
Influence of Surface Geometry on the Hydrodynamic Performances of Parallel Bearings in Transient Flow Conditions
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DOI：
10.1080/10402004.2013.813997
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发表时间：
2013-06
影响因子：
2.1
通讯作者：
A. Gherca;A. Fatu;M. Hajjam;P. Maspeyrot
中科院分区：
文献类型：
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作者：
A. Gherca;A. Fatu;M. Hajjam;P. Maspeyrot
因为实际上并不存在完全光滑的表面，所以流体力学的经典原理规定，处于相对运动中的两个表面之间的流动基本上是不稳定的。因此，流体膜轮廓可以在空间和时间上经受快速振荡。本文展示了这些振荡如何依赖于表面几何形状。通过采用瞬态质量守恒空化模型，我们研究了几种情况下，表面粗糙度和表面纹理被认为是对两个表面的平行轴承。对于施加的载荷，该模型显示了表面几何形状对轴承的流体动力学性能的影响，包括标称油膜厚度、摩擦力和体积流量。此外，结果说明了不同的操作参数，如施加的负载和移动表面的速度如何影响轴承内的气穴现象的存在。
Because a perfectly smooth surface does not actually exist, the classical principles of fluid mechanics dictate that the flow between two surfaces that are in relative motion is fundamentally unsteady. Therefore, the fluid film profile can be submitted to rapid oscillations in both space and time. This article shows how these oscillations become dependent on the surface geometry. By employing a transient mass-conserving cavitation model, we study several cases in which surface roughness and surface texturing are considered on both surfaces of a parallel bearing. For an applied load, the model shows the impact of surface geometry on the hydrodynamic performance of the bearing in terms of nominal film thickness, friction force, and volumetric flow rate. In addition, the results illustrate how different operating parameters such as the applied load and the speed of the moving surface affect the presence of cavitation within the bearing.