Application of a wall function to simulate turbulent flows in foil bearings at high rotational speeds

Qin, Kan; Gollan, Rowan; Jahn, Ingo

doi:10.1016/j.triboint.2017.06.018

Cited by 13 publications

(4 citation statements)

References 20 publications

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Section: Model and Methodsmentioning

confidence: 99%

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The fluid-thermal-structural interaction analysis of a new multifoil aerodynamic thrust bearings

Xiong,

Xu,

Huang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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In the present study, a multiphysics simulation model was established to evaluate the effects of the fluid-thermal-structural interaction on the performance of multifoil gas lubrication thrust bearing. The thermal and elastic deformation mechanisms of multifoil bearings were studied in detail, and the effects of the preload ratio and foil structural parameters on the bearing performance were analyzed. The results show that the preload ratio determines the performance of the multifoil thrust bearing. A small preload helps the bearing maintain a low lift-off speed, whereas a large preload is helpful in improving the bearing load capacity. The thickness of the foil has a significant effect on the gas film pressure distribution and the down foil thickness plays a leading role in the load capacity.

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Section: Model and Methodsmentioning

confidence: 99%

“…The shear stress transport k-ω model is applied in the fluid domain, which is verified that it can achieve good agreement with the experimental results when used in the study of hydrodynamic bearings. 30 The gas-specific heat capacity and thermal conductivity can be expressed as the polynomial using the numerical data 31 :…”

Section: Mathematical Modelmentioning

confidence: 99%

The fluid-thermal-structural interaction analysis of a new multifoil aerodynamic thrust bearings

Xiong,

Xu,

Huang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…There are no commercial options for bearings that will be capable of operating in the hot high-pressure high-temperature sCO 2 . Earlier, the University of Queensland explored the possibility of designing bearings and seals that could be placed within the pressure boundary [23][24][25][26] of a sCO 2 turbine. While this would make the mechanical design task easier, the windage losses would be too high.…”

Section: Astri Turbine Configurationmentioning

confidence: 99%

Bearing and Seal Selection for a High-Temperature Supercritical CO2 Turbine

Gurgenci¹,

Li²,

Guan³

2019

Proceedings of Global Power &Amp; Propulsion Society

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Solar power towers using supercritical CO 2 (sCO 2 ) Brayton cycles were proposed as the next-generation Concentrating Solar Thermal (CST) technology. One of the challenges facing rapid deployment of CST using sCO 2 cycles remains to be the power block and, in particular, the lack of reliable sCO 2 turbine technology. The main challenge for sCO 2 turbine designers is in the area of component technologies such as materials, bearings and seals. The combination of high temperatures (above 600 o C), high rotational speeds, and high fluid densities create a perfect storm for sCO 2 turbine designers. This paper investigates appropriate bearings and seals for a sCO 2 radial-in-flow turbine proposed for Concentrating Solar Thermal applications.

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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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Application of a wall function to simulate turbulent flows in foil bearings at high rotational speeds

Cited by 13 publications

References 20 publications

The fluid-thermal-structural interaction analysis of a new multifoil aerodynamic thrust bearings

The fluid-thermal-structural interaction analysis of a new multifoil aerodynamic thrust bearings

Bearing and Seal Selection for a High-Temperature Supercritical CO2 Turbine

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

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