A Mixed Zero-equation and One-equation Turbulence Model in Fluid-film Thrust Bearings

IF 2.2 3区 工程技术 Q2 ENGINEERING, MECHANICAL Journal of Tribology-transactions of The Asme Pub Date : 2023-10-30 DOI:10.1115/1.4063945
Xin Deng
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Abstract

Abstract A thrust bearing is a rotary bearing that facilitates rotational movement between components and is specifically engineered to provide support for a load that is parallel to the axis of rotation. The generation of the inter-surface film pressure is attributed to the relative motion (rotation) of the surfaces, which results in the lubricant being drawn into the converging wedge formed between them. The interface between the unmovable and moving parts is demarcated by a slender layer of lubricating fluid, including but not limited to oil, water, air, or other process fluid. The conventional zero-equation model can be enhanced to achieve higher precision in forecasting and reduce dependence on empirical data, owing to its inherent limitations. A novel turbulence model that combines zero-equation and one-equation approaches has been developed and implemented in the recently introduced modeling tool package for thrust bearings. In the Prandtl one-equation turbulence model, the length scale is a necessary but undetermined term. A novel mixed model has been implemented utilizing the Prandtl one equation along with a novel length scale. The tool package is a Thermo-hydrodynamic (THD) code that involves iterative computations between the Reynolds' equation, turbulence equation, energy equation within the film, and conduction equation in pad and runner. The new model yields an eddy viscosity that exhibits a substantial level of proximity to both Eddy Viscosity Transport (EVT) and Direct Numerical Simulation (DNS), and exhibits significant enhancements in comparison to the traditional Ng-Pan zero-equation turbulence model.
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流体膜推力轴承的混合零方程和单方程湍流模型
推力轴承是一种旋转轴承,它促进了部件之间的旋转运动,并专门设计用于支持平行于旋转轴的负载。表面间膜压力的产生是由于表面的相对运动(旋转),导致润滑剂被吸入它们之间形成的会聚楔形。不可移动部件和活动部件之间的界面由一细长的润滑流体层划分,润滑流体包括但不限于油、水、空气或其他工艺流体。传统的零方程模型由于其固有的局限性,可以提高预测精度,减少对经验数据的依赖。在最近推出的推力轴承建模工具包中,开发了一种结合零方程和单方程方法的新型湍流模型。在Prandtl单方程湍流模型中,长度尺度是一个必要但不确定的项。利用普朗特一方程和新的长度尺度实现了一种新的混合模型。该工具包是一个热流体动力学(THD)代码,包括雷诺方程、湍流方程、膜内能量方程以及垫层和流道内的传导方程之间的迭代计算。新模型产生的涡流黏度与涡流黏度输运(EVT)和直接数值模拟(DNS)相当接近,与传统的Ng-Pan零方程湍流模型相比有显著增强。
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来源期刊
Journal of Tribology-transactions of The Asme
Journal of Tribology-transactions of The Asme 工程技术-工程:机械
CiteScore
4.20
自引率
12.00%
发文量
117
审稿时长
4.1 months
期刊介绍: The Journal of Tribology publishes over 100 outstanding technical articles of permanent interest to the tribology community annually and attracts articles by tribologists from around the world. The journal features a mix of experimental, numerical, and theoretical articles dealing with all aspects of the field. In addition to being of interest to engineers and other scientists doing research in the field, the Journal is also of great importance to engineers who design or use mechanical components such as bearings, gears, seals, magnetic recording heads and disks, or prosthetic joints, or who are involved with manufacturing processes. Scope: Friction and wear; Fluid film lubrication; Elastohydrodynamic lubrication; Surface properties and characterization; Contact mechanics; Magnetic recordings; Tribological systems; Seals; Bearing design and technology; Gears; Metalworking; Lubricants; Artificial joints
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