Performance Analysis of High Speed Floating Ring Hybrid Bearing in the Laminar and Turbulent Regimes

Gao, Hong; Xia, Bo Qian; Cen, Shao Qi

doi:10.4028/www.scientific.net/amr.197-198.1776

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…The dynamic investigation of this bearing type has been carried out elaborately in the works [8][9][10]. Hence, the experimental results of the velocity distribution are obtained in [11,12] and the static, dynamic characteristics of high speed journal floating ring hybrid bearing compensated by interior restrictor under laminar flow and turbulent flow respectively [13].…”

Section: Engineeringmentioning

confidence: 99%

Analytical study of the velocity of the lubricating fluid in the hydrodynamic journal bearing with the effect of centrifugal force for short bearing type

Thang

2022

Eureka: PE

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The paper aims to obtain the expression of the velocity of lubricating fluid in the hydrodynamic journal bearings by analytical method. In the classical short-bearing theory, the fluid flow was studied by ignoring the effect of centrifugal force of the lubricating fluid film. However, the self-oscillation of the shaft of high-power motors does not follow the rules in classical hydrodynamic lubrication theory. To explain this phenomenon, a modified form of Reynolds equation, in which the influence of centrifugal force of the lubricant is not ignored, is established. The study aims to establish the modified Reynolds equation by including the effect of centrifugal forces for the case of the short bearing type. Integration of the Navier-Stokes equations, yield the expressions for the components of velocity of the lubricating fluid in the gap. The oil’s pressure in the hydrodynamic journal bearing is obtained by solving the modified Reynolds equation. The numerical results are considered in the case of the stable equilibrium position of the motion of the shaft, i.e. the symmetry axis of the shaft does not move. The plots of the velocity components in the tangential axial direction are displayed too. The theoretical results of a parabolic velocity distribution similar to that of a Newtonian fluid, derived from a Bingham plastic flow model. The flow in the gap, which are obtained by analytical method, are completely consistent with its boundary conditions and its physical properties. Further, with these results, the paper as a lemma to solve the dynamics problem in floating ring bearing with the influence of the centrifugal force of the lubricant

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Section: Engineeringmentioning

confidence: 99%

Analytical study of the velocity of the lubricating fluid in the hydrodynamic journal bearing with the effect of centrifugal force for short bearing type

Thang

2022

Eureka: PE

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“…Frenea [5] and Wang [6] investigated the characteristics of hybrid bearing under big Reynolds number. Guo [7]…”

Section: Introductionmentioning

confidence: 99%

Floating Ring Balance Analysis of Journal Floating Ring Hybrid Bearing in Turbulent Regime

Gao

Zhang

2014

AMM

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An externally pressurized deep/shallow pockets hybrid journal floating ring bearing compensated by flat capillary restrictor which can meet the need of high speed rotating machinery is presented in this paper. Bases on turbulent flow theory, the equations governing the flow of inner and outer fluid film in the journal floating ring bearing are established. The control equations together with the pressure boundary condition and the restrictor flow equation are solved by using the Finite Element Method. The balance of floating ring is achieved by adjusting ring-to-shaft speed ratio, inner film radial clearance and inner film eccentricity ratio. It can be seen from simulation results that the ring-to-shaft speed ratio and inner film clearance vary slightly and the floating ring can keep balance under different speed and eccentricity ratio. The variation of static and dynamic performance with eccentricity and rotational speed are calculated and analyzed based on floating ring balance.

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“…Guo [1,2,3] and Cen [4] presented a theoretical and experimental study for the performance of journal and conical hybrid bearings based on laminar lubrication theory. Frenea [5] and Wang [6] investigated the characteristics of hybrid bearing under big Reynolds number. Guo [7] analyzed the characteristics of journal floating ring bearing under laminar and turbulent flow respectively.…”

Section: Introductionmentioning

confidence: 99%

Research on Static Characteristics of Deep/Shallow Pockets Hybrid Bearing under Laminar and Turbulent Mixed Regimes

Gao

Zhang²,

Cen

2011

AMR

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For high speed hybrid journal bearing with deep/shallow pockets, film thickness and film Reynolds number vary considerably in different position. Laminar flow and turbulent flow exist simultaneously in the bearing film. This paper establishes the laminar and turbulent mixed film control equations and the pressure boundary conditions together with the restrictor flow equation for a deep/shallow pockets journal hybrid bearing compensated by interior restrictor. The static characteristics such as attitude angle, load carrying capacity, friction power loss and flow volume rate are given by solving the equations with Finite Element Method. By comparing the laminar, turbulent and mixed flow results, it can be seen that the coefficients are proximity under journal speed 5000 rpm (only part of deep pockets is turbulent flow). But the characteristics coefficients of three flow models contrast evidently under journal speed 50000 rpm (deep and shallow pockets are turbulent flow, part of bearing land is laminar flow). Laminar and turbulence mixed flow lubrication theory is more accurate to high speed hybrid bearing with deep/shallow pockets.

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Performance Analysis of High Speed Floating Ring Hybrid Bearing in the Laminar and Turbulent Regimes

Cited by 6 publications

References 5 publications

Analytical study of the velocity of the lubricating fluid in the hydrodynamic journal bearing with the effect of centrifugal force for short bearing type

Analytical study of the velocity of the lubricating fluid in the hydrodynamic journal bearing with the effect of centrifugal force for short bearing type

Floating Ring Balance Analysis of Journal Floating Ring Hybrid Bearing in Turbulent Regime

Research on Static Characteristics of Deep/Shallow Pockets Hybrid Bearing under Laminar and Turbulent Mixed Regimes

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