A Comparison of Flow Fields Predicted by Various Turbulent Lubrication Models With Existing Measurements

Wang, Xiaojing; Zhang, Zhiming; Sun, Meng

doi:10.1115/1.555390

Cited by 11 publications

(4 citation statements)

References 8 publications

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“…where h 0 is minimum oil film thickness, h p is microtexture depth, w is circumferential coordinate, r is radial coordinate, p is fluid pressure, m is the dynamic viscosity of lubricating fluid and v is the thrust bearing rotational speed. Modern machinery is evolving toward higher rotational speeds and greater power; it has been demonstrated that many largescale bearings have already operated in turbulent flow conditions (Wang et al, 2000). The motion characteristics of viscous fluids differ significantly between laminar and turbulent flow states.…”

Section: The Theoretical Model Of Numerical Calculationmentioning

confidence: 99%

“…Modern machinery is evolving toward higher rotational speeds and greater power; it has been demonstrated that many large-scale bearings have already operated in turbulent flow conditions (Wang et al , 2000). The motion characteristics of viscous fluids differ significantly between laminar and turbulent flow states.…”

Section: The Theoretical Model Of Numerical Calculationmentioning

confidence: 99%

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Performance analysis of columnar convex-concave compound microtexture thrust bearing

Wang,

Liu,

Duan

et al. 2024

ILT

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Purpose This study aims to enhance the lubrication performance of thrust bearings. The influence of columnar convex–concave compound microtexture on bearing performance is investigated Design/methodology/approach Based on the compound microtexture model of thrust bearings, considering surface roughness and turbulent effect, the variation of lubrication characteristics with the change in the compound microtexture parameters is studied. Findings The results indicate that, compared with circular microtexture, the maximum pressure of compound microtexture of thrust bearings increases by 7.42%. Optimal bearing performance is achieved when the internal microtexture depth is 0.02 mm. Turbulent flow states and surface roughness lead to a reduction in the optimal depth. The maximum pressure and load-carrying capacity of the bearing decrease as the initial angle increases, whereas the friction coefficient increases with the increase in the initial angle. The lubrication performance is best for bearings with a circumferential parallel arrangement of microtexture. Originality/value The novel composite microtexture with columnar convex-concave is proposed, and the computational model of thrust bearings is set. The influence of surface roughness and turbulent flow on the bearing performance should be considered for better conforming with engineering practice. The effect of microtexture depth, arrangement method and distribution position on the lubrication performance of the compound microtexture thrust bearing is investigated, which is of great significance for improving tribology, thrust bearings and surface microtexture theory.

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Section: The Theoretical Model Of Numerical Calculationmentioning

confidence: 99%

Section: The Theoretical Model Of Numerical Calculationmentioning

confidence: 99%

Performance analysis of columnar convex-concave compound microtexture thrust bearing

Wang,

Liu,

Duan

et al. 2024

ILT

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“…kx, kz turbulence factor is a function of the local Reynolds number from the wall's law [10] obtained the following formula 0.9 0.98 12 0.0136(Re) 12 0.0043(Re)…”

Section: Fig1 Failure Bearing Picturesmentioning

confidence: 99%

Fault Analysis of Journal Bearing Considering the Turbulent and Thermo-Hydrodynamic Effects

Jian

Geng

et al. 2014

AMM

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In order to investigate the cause of the typical bush rupture and wear damages in the journal bearing of the steam turbine generator set, the lubrication turbulence and thermo-hydrodynamic effects were studied. The generalized Reynolds equation, energy equation and heat conduction equations were solved with the finite difference method, and the pressure, temperature, thickness distribution of the oil film were obtained. Analysis results can be well explains the bearing bush burst in bearings maximum pressure place because of heavy load running. The bearing bush burst made friction intensified that caused oil temperature increasing and the viscosity reduce, which led to the rotor eccentricity increase, the minimum film thickness smaller and bearing static working point down, thus causing the wear damages until shutdown.

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“…Numerous researchers have studied turbulent lubrication, and various models have been proposed, including the Ng–Pan model (Ng, 1964; Ng and Pan, 1965), bulk flow model (Hirs, 1970; Hirs, 1973), Constantinescu model (Constantinescu, 1962) and Elrod–Ng model (Elrod and Ng, 1967). Wang et al. (2000) evaluated the accuracy of the turbulence model mentioned above and pointed out that the Ng–Pan model has a wider range of applicability.…”

Section: Introductionmentioning

confidence: 99%

Analysis of turbulent cavitation effects on water-lubricated bearing in single screw compressors

Wang,

Wu,

Zhang

et al. 2024

ILT

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Purpose To guide the stable radius clearance choice of water-lubricated bearings for single screw compressors, this paper aims to analyze the effects of turbulence and cavitation on bearing performance under two conditions of specified external load and radius clearance. Design/methodology/approach A modified Reynolds equation considering turbulence and cavitation is adopted, based on the Jakobsson–Floberg–Olsson boundary condition, Ng–Pan model and turbulent factors. The equation is solved using the finite difference method and successive over-relaxation method to investigate the bearing performance. Findings The turbulent effect can increase the hydrodynamic pressure and cavitation. In addition, the turbulent effect can lead to an increase in the equilibrium radius clearance. The turbulent region exhibits a higher load capacity and cavitation rate. However, the increased cavitation negatively impacts the frictional coefficient and end flow rate. The impact of turbulence increases as the radius clearance decreases. As the rotating speed increases, the turbulence effect has a greater impact on the bearing characteristics. Originality/value The research can provide theoretical support for the design of water-lubricated journal bearings used in high-speed water-lubricated single screw compressors. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-01-2024-0029/

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A Comparison of Flow Fields Predicted by Various Turbulent Lubrication Models With Existing Measurements

Abstract: Flow field predictions of various turbulent lubrication models are compared with the existing experimental data of turbulent Couette flow and shear-induced countercurrent flow. [S0742-4787(00)00502-6]

Cited by 11 publications

References 8 publications

Performance analysis of columnar convex-concave compound microtexture thrust bearing

Performance analysis of columnar convex-concave compound microtexture thrust bearing

Fault Analysis of Journal Bearing Considering the Turbulent and Thermo-Hydrodynamic Effects

Analysis of turbulent cavitation effects on water-lubricated bearing in single screw compressors

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