Static characteristics of a water-lubricated hydrostatic thrust bearing with a porous land region and a capillary restrictor

Hanawa, Naoki; Kuniyoshi, Masanori; Miyatake, Masaaki; Yoshimoto, Shigeka

doi:10.1016/j.precisioneng.2017.06.002

Cited by 25 publications

(19 citation statements)

References 7 publications

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“…This mainly happened at high velocities during the experiments, and PEEK was in mixed lubrication condition and hydrodynamic lubrication condition. Such phenomena have been proved and explained by previous studies 3,5,26,29 . When the water film could not form effectively, the friction pairs would contact directly.…”

Section: Discussionmentioning

confidence: 53%

“…The schematic of the tester is shown in Figure 1. The experimental velocities and contact pressures were chosen as 50 (0.06 m/s), 150 (0.19 m/s), 250 (0.31 m/s), 350 (0.44 m/s) r/min and 0.3, 0.5, 0.7 MPa, respectively, based on previous study 5,26 . Each experiment lasted for 120 min and the distilled water was used as lubricant.…”

Section: Methodsmentioning

confidence: 99%

“…Up to now, there are few studies or reports on the water lubrication performance of PEEK, especially the lubricating mechanism under various contact pressures and velocities. Due to the low viscosity of the water, the water film between the water‐lubricated bearings and shafts cannot be formed effectively, especially when the ships are in extreme working conditions, such as high load and low speed 25,26 . Moreover, the contact pressure that influenced by the tilt of the ships are very complex and the working experimental velocities are in a wide range.…”

Section: Introductionmentioning

confidence: 99%

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Insight into water lubrication performance of polyetheretherketone

Guo

Yuan

2020

J of Applied Polymer Sci

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Polyetheretherketone (PEEK) is a kind of polymer with excellent mechanical properties combined with good wear resistance and has been widely used in the engineering field. In order to explore the possibility for PEEK using as a water-lubricated bearing material, an in-depth study on the water lubrication performance of PEEK was conducted by using a series of experiments. The water lubrication performances combined with the lubricating mechanism were evaluated both by the friction coefficient and by the wear behavior of PEEK. The results indicated that PEEK was suitable for water-lubricated bearing productions. The water film could form effectively between the friction pairs under high sliding velocity, while the transfer film could form under low sliding velocity. Both the water film and the transfer film could improve the water lubrication performance for the friction pairs. Moreover, sliding velocities and contact pressures highly influence the water lubrication performance of PEEK. The increase in contact pressure or the decrease in sliding velocity would exacerbate the wear of material. The stick-slip phenomena also occurred on the specimens under low sliding velocity. The main purpose of this study is to provide an experimental basis for PEEK using as a waterlubricated bearing material.

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Section: Discussionmentioning

confidence: 53%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Insight into water lubrication performance of polyetheretherketone

Guo

Yuan

2020

J of Applied Polymer Sci

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“…Rotating channel is the foundation of researching the effect of Coriolis and centrifugal force on turbulent flow in rotating system. 1,2 Johnston et al 3 found the rotational asymmetry effect and the large-scale vortex structure in experiment for the first time. Based on the experimental results, Nakabayashi and Kitoh 4 discussed the influence of rotation on the Reynolds shear stress transport equation further.…”

Section: Introductionmentioning

confidence: 99%

Study on performance of thrust disk as auxiliary impeller

Bai

Zhao

Zhou

et al. 2021

Advances in Mechanical Engineering

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Thrust disk as auxiliary impeller has a vital effect on the big power pump unit with wet motor. It can balance the axial force of the unit, provide power for internal cooling circulation circuit of motor, and further reduce the axial length of the unit. Due to the motor chamber space is limited, and the transmission medium is liquid which needs to consider the effect of cavitation, the research of thrust disk of auxiliary impeller is different from the previous studies of rotating channel. In this paper, the hydraulic performance and cavitation characteristics of thrust disk as auxiliary impeller are investigated experimentally under different conditions. A thrust disk test rig was established to obtain data under different rotation speeds and flow points. Three types of volutes with different outlet angles were designed to match the thrust disk as auxiliary impeller in experiments. Results indicate that the law of speed proportion for the traditional centrifugal pump is not applicable to the head of thrust disk as auxiliary impeller. In addition, the flow coverage increases slightly with rotation speed. Furthermore, the higher the speed is, the larger the NPSHs is, and the narrower the range of NPSH is. Besides, the smaller the outlet angle is, the higher the head of the thrust disk as auxiliary impeller is, the worse anti-cavitation performance is. The research could provide reference and guidance for the design of thrust disk as auxiliary impeller.

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“…Many numerical investigations are reported analysing the influence of porosity on performance of various fluid film bearings such journal bearings (Boubendir et al , 2011), step-slider bearing Lin (2011), Naduvinamani and Siddangouda (2007), parallel plates Madalli et al (2018), etc. Recently, Hanawa et al (2017) performed numerical and experimental simulations on porous surface hydrostatic thrust bearing using capillary tube as a restrictor. The authors examined the performance of solid surface thrust bearing vis-a-vis conventional porous thrust bearing and newly proposed thrust bearing having porous layer in the land region.…”

Section: Introductionmentioning

confidence: 99%

Rotor-dynamic performance of porous hydrostatic thrust bearing operating under magnetic field

Kumar

Shah

Singh

et al. 2020

ILT

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Purpose The porous bearings are commonly used in slider thrust bearings owing to their self-lubricating properties and cost effectiveness as compared to conventional hydrodynamic bearings. The purpose of this paper is to numerically investigate usefulness of porous layer in hydrostatic thrust bearing operating with magnetic fluid. The effect of magnetic field and permeability has been analysed on steady-state (film pressure, film reaction and lubricant flow rate) and rotor-dynamic (stiffness and damping) parameters of bearing. Design/methodology/approach Finite element approach is used to obtain numerical solution of flow governing equations (Magneto-hydrodynamics Reynolds equation, Darcy law and capillary equation) for computing abovementioned performance indices. Finite element method formulation converts elliptical Reynolds equation into set of algebraic equation that are solved using Gauss–Seidel method. Findings It has been reported that porosity has limited but adverse effects on performance parameters of bearing. The adverse effects of porosity can be minimized by using a circular pocket for achieving better steady-state response and an annular/elliptical pocket, for having better rotor-dynamic response. The use of magnetic fluid is found to be substantially enhancing the fluid film reaction (53%) and damping parameters (55%). Practical implications The present work recommends use of circular pocket for achieving better steady-state performance indices. However, annular and elliptical pockets should be preferred, when design criteria for the bearing are better rotor-dynamic performance. Originality/value This study deals with influence of magnetic fluid, porosity and pocket shape on rotor-dynamic performance of externally pressurized thrust bearing. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0289/

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Static characteristics of a water-lubricated hydrostatic thrust bearing with a porous land region and a capillary restrictor

Cited by 25 publications

References 7 publications

Insight into water lubrication performance of polyetheretherketone

Insight into water lubrication performance of polyetheretherketone

Study on performance of thrust disk as auxiliary impeller

Rotor-dynamic performance of porous hydrostatic thrust bearing operating under magnetic field

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