A fluid-structure-thermal model for bump-type foil thrust bearings

Qin, Kan; Jacobs, Peter A.; Keep, Joshua A.; Li, Daijin; Jahn, Ingo

doi:10.1016/j.triboint.2018.02.008

Cited by 21 publications

(10 citation statements)

References 25 publications

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“…The load carrying capacity is found to be increasing with rotating speed until certain value after which it decreases. Recently, Qin et al 100 developed a complete fluid-structure-thermal simulation model for thrust bearing. Individual solvers for transient fluid flow, structural deformation, heat conduction and coupling strategy were also discussed.…”

Section: Gftbmentioning

confidence: 99%

A review of thermohydrodynamic aspects of gas foil bearings

Kumar

Khamari

Behera

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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In recent times, gas foil bearings have become popular for commercial use in the aircraft and space industry, turbocompressors, turbine generators and in the more complex fields of turbochargers and turboexpanders. The gain in popularity for gas foil bearings is due to their features such as contamination-free zone, wide temperature range, higher stability and higher reliability characteristics as compared to other types of bearings. However, several challenges have come across while analysing the gas foil bearing behaviour at different working conditions. The current paper presents an overview of the work done in the past few decades for developing numerical models and listing the efforts of several researchers around the world to conduct the experimental investigation for predicting and analysing thermohydrodynamic behaviour of gas foil bearings at different operating conditions. It is expected that the current paper will help readers to thoroughly understand the hydrodynamic and thermal aspects of gas foil bearings.

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Section: Gftbmentioning

confidence: 99%

A review of thermohydrodynamic aspects of gas foil bearings

Kumar

Khamari

Behera

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…The thermal submodels of bearing parts are also developed. Qin et al 38 developed a complete fluid-structurethermal simulation model. Individual solvers are developed for transient fluid flow, structural deformation and heat conduction.…”

Section: Introductionmentioning

confidence: 99%

Influence of slip-flow phenomenon on thermohydrodynamic behaviour of gas foil thrust bearings

Kumar

Khamari

Behera

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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Gas foil bearings are often used in high-speed turbomachinery such as turboexpanders and turbochargers due to their merits over simple gas-lubricated bearings. The merits of gas foil bearings include their ability to tailor dynamic parameters such as stiffness and damping. Gas foil bearings usually have low clearance and operate at a high rotational speed, which eventually leads to velocity slip at the solid–fluid interface. This article investigates the effect of slip flow on various parameters of gas foil thrust bearings. A numerical model is formulated to predict pressure, film thickness and temperature distribution of helium lubricated gas foil thrust bearing at high rotating speed. The Reynolds equation is modified by assuming first-order slip coupled with the structural (compliant) and energy equation. The temperature-dependent viscosity and density of the fluid are also considered in the Reynolds equation to predict the thermohydrodynamic behaviour of gas foil thrust bearings. The numerical model thus developed uses a finite-difference method and the Newton–Raphson method to solve the Reynolds equation,whereas the successive over-relaxation method is used to solve the energy equation. Various performance parameters are compared for slip and no-slip conditions for gas foil thrust bearings. The results show a considerable difference between the two phenomena. Also, the conventional Reynolds equation tends to overestimate the load-carrying capacity.

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“…However, the structural deformation results were not presented. Qin et al [18][19][20] developed a 3D THED model by using the CFD code Eilmer, considering the detailed structure model, complex fluid flow, CO 2 medium, turbulence, and wall function, etc., which helped to predict the bearing performance more accurately. Kim et al [21] considered the leading-edge groove region as the inlet thermal boundary conditions in the CFD model and developed the THD model by extending the solution domain to surrounding structures.…”

Section: Introductionmentioning

confidence: 99%

The Fluid-Structure-Thermal Performance Analysis of Gas Foil Thrust Bearing by Using Computational Fluid Dynamics

Liu

2022

Lubricants

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This paper presents a detailed three-dimensional (3D) thermo-elastic-hydrodynamic (TEHD) multi-physics model of the bump-type gas foil thrust bearing based on computational fluid dynamics (CFD). In this model, the moving mesh technology is applied in the fluid flow domain, and the new boundary condition of fully developed flow is applied at the inlet and outlet boundaries, which is consistent with the continuous property of fluid flow and has better convergence performance in CFD. The groove between pads is set as the symmetry boundary. The contact pairs with Coulomb friction and contact/separation behaviors are considered in the structure deformation and heat transfer. The simulation results indicated that the boundary pressure has a significant influence on the foil deformation. It also revealed the heat flux transfer path and temperature distribution in the gas foil thrust-bearing (GFTB) system.

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A fluid-structure-thermal model for bump-type foil thrust bearings

Cited by 21 publications

References 25 publications

A review of thermohydrodynamic aspects of gas foil bearings

A review of thermohydrodynamic aspects of gas foil bearings

Influence of slip-flow phenomenon on thermohydrodynamic behaviour of gas foil thrust bearings

The Fluid-Structure-Thermal Performance Analysis of Gas Foil Thrust Bearing by Using Computational Fluid Dynamics

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