Multiscale analysis and numerical simulation of hydrodynamic inclined fixed pad thrust bearing with ultra low surface separation

IF 0.6 4区 工程技术 Q4 MECHANICS Mechanika Pub Date : 2023-02-06 DOI:10.5755/j02.mech.30821
Wei Zhu, Chen Huang, Chao-Min Wang, Yongbin Zhang
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Abstract

In the hydrodynamic inclined fixed pad thrust bearing, when the surface separation is ultra low, there will be the special hydrodynamic mode where in the inlet zone occur both the adsorbed boundary layer flows and the intermediate continuum fluid flow i.e. the multiscale flow and in the outlet zone only occurs the physical adsorbed boundary layer flow. This new mode of hydrodynamic bearing has not been addressed before. Here, we present the corresponding multiscale hydrodynamic analysis for this bearing. The inlet zone flow is described by the closed-form explicit multiscale flow equations. The outlet zone flow is described by the nanoscale flow equation. First, the analytical derivations for the pressure distribution and carried load of the bearing were feasibly made by making a reasonable assumption. Then, full numerical solutions to the bearing were obtained to verify the analytical solution. It was found that there are significant differences between the analytically calculated pressure distribution and the numerically solved pressure distribution for the same operating condition; however for the studied different fluid-bearing surface interactions, when the surface separation is relatively large, the analytically derived load equation can be used to calculate the carried load of the bearing. Numerical solutions clearly show that stronger the fluid-bearing surface interaction, higher the generated hydrodynamic pressure in the bearing, and larger the carried load of the bearing. The study not only provides the mathematical tools for studying the bearing but also gives the indication of the strong adsorbed boundary layer effect in this bearing.
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超低表面分离流体动力斜垫推力轴承的多尺度分析与数值模拟
在流体动力斜垫推力轴承中,当表面分离度超低时,将存在一种特殊的流体动力模式,即在入口区同时发生吸附边界层流动和中间连续流体流动,即多尺度流动,而在出口区仅发生物理吸附边界层流。这种新型的动压轴承以前从未被提及。在此,我们对该轴承进行了相应的多尺度流体动力学分析。入口区流动由闭合形式的显式多尺度流动方程描述。出口区流量由纳米级流量方程描述。首先,通过合理的假设,对轴承的压力分布和承载力进行了可行的分析推导。然后,得到了轴承的全数值解,验证了解析解的正确性。研究发现,在相同工况下,解析计算的压力分布与数值求解的压力分布存在显著差异;然而,对于所研究的不同流体-轴承表面相互作用,当表面分离较大时,可以使用解析推导的载荷方程来计算轴承的承载载荷。数值解清楚地表明,流体-轴承表面相互作用越强,轴承中产生的动压越高,轴承的承载载荷也越大。该研究不仅为研究该轴承提供了数学工具,而且表明了该轴承中的强吸附边界层效应。
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来源期刊
Mechanika
Mechanika 物理-力学
CiteScore
1.30
自引率
0.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is publishing scientific papers dealing with the following problems: Mechanics of Solid Bodies; Mechanics of Fluids and Gases; Dynamics of Mechanical Systems; Design and Optimization of Mechanical Systems; Mechanical Technologies.
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