Tailoring of the bearing stiffness to enhance the performance of gas-lubricated bump-type foil thrust bearing

Gad, Abdelrasoul M.; Kaneko, Shigehiko

doi:10.1177/1350650115606482

Cited by 22 publications

(19 citation statements)

References 30 publications

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“…al. [8] was also implemented by Gad and Kaneko [13] to predict the temperature distribution for air foil thrust bearings. Lee and Kim [14] conducted a three-dimensional thermo-hydrodynamic analysis of Raleigh step air foil thrust bearings with forced cooling air flow and the optimum cooling air pressure was found based on the reference simulation condition.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

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

Qin

Jacobs

Keep

et al. 2018

Tribology International

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Please cite this article as: Qin K, Jacobs PA, Keep JA, Li D, Jahn IH, A fluid-structure-thermal model for bump-type foil thrust bearings, Tribology International (2018),• Implementation of a computational framework for fluid-structure-thermal simulations.• The fluid-thermal coupling is validated.• A third of the generated heat is advected with the fluid in the CO2 case, compared to only 3% for the air case.• Heat transfer to the stator is similar for both air and CO2 cases. AbstractThis paper presents a multi-physics multi-timescale computational framework for the three-dimensional and two-way coupled fluid-structure-thermal simulation of foil thrust bearings. Individual solvers for the transient fluid flow, structural deformation, heat conduction and the coupling strategy are discussed. Next, heat transfer models of the solid structures within foil thrust bearings are also described in detail. The result is a multi-physics computational framework that can predict the steady state and dynamic performance of foil thrust bearings. Numerical simulations of foil thrust bearings with air and CO 2 are then performed. It is found that the centrifugal pumping that naturally occurs in CO 2 bearings due to the high fluid density provides a new and effective cooling mechanism for the CO 2 bearing.

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

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

Qin

Jacobs

Keep

et al. 2018

Tribology International

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show abstract

“…These iteration methods were reviewed and compared by Wang et al [83]. Once steady state performance is achieved, the load capacity F and friction torque T from Reynolds equation are calculated as [84,85], For some applications, the dynamic performance of foil bearings including rotordynamic stiffness and damping coefficients is also of interest. The small perturbation approach has been used to obtain dynamic force coefficients [84].…”

Section: Heat Exchangermentioning

confidence: 99%

“…Little work had been undertaken to model the temperature field for foil thrust bearings. The Couette flow approximation of the energy equation from Salehi et al [110] was used by Gad and Kaneko [85] to predict the temperature distribution for air foil thrust bearings. Lee and Kim [113] conducted a three-dimensional thermo-hydrodynamic analysis of Raleigh step air foil thrust bearings with a forced air cooling and the optimum cooling air pressure was found for the reference simulation condition.…”

Section: Thermal Performancementioning

confidence: 99%

“…However, the current comparison is restricted to laminar formulation shown in Equation 2.4, and the laminar simulation for Eilmer. The load capacity F and friction torque T for the Reynolds equation solution are calculated as [84,85],…”

Section: Comparison Between Reynolds Equation and Eilmermentioning

confidence: 99%

“…In literature, typically only the ramp and flat regions of foil thrust bearings are considered as the computational domain [8,26,76,84,85], and a fixed static pressure boundary condition is set at the leading and trailing edges (see Figure 5.28(a)). Thus, the groove region between two adjacent bearing pads is neglected, and the pressure in this region is commonly assumed as ambient.…”

Section: Revisit Of Computational Domain: Steady State Performancementioning

confidence: 99%

See 2 more Smart Citations

Development and application of multiphysics simulation tools for foil thrust bearings operating with carbon dioxide

Qin¹

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Foil bearings can enable different turbomachinery architecture. The use of the cycle's working fluid within the bearings results in an oil-free and compact turbomachinery system. Using CO 2 as the operating fluid for a foil bearing creates new operating and new modelling challenges. These include turbulent flow within the film, non-negligible inertia forces, high windage losses, non-ideal gas behaviour and reduced rotordynamic damping. Since the flow phenomena within foil bearings are complex, involving fluid flow, structural deformation and heat transfer, use of the conventional Reynolds equation is not proven to be suitable for foil bearings with CO 2 as the operating fluid. To address these modelling issues, a multi-physics multi-timescale simulation tool including fluid, structure and thermal solvers was developed to predict the performance of foil bearings and to create insight on their operations with CO 2. New flow physics and operation challenges for foil thrust bearings with

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Performance investigation and feasibility study of novel gas foil thrust bearing for hydrogen fuel cell vehicles

Shi

Huang

Chen

et al. 2022

Intl J of Energy Research

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Summary Centrifugal air compressors are promising due to their zero emissions, long driving range, and wide fuel sources. The gas foil thrust bearing (GFTB) is considered as one of the key components in the centrifugal air compressor to guarantee the system is oil‐free and reliable due to there is self‐acting and high speed. However, the gas foil thrust bearings were all of lower capacity in previous research. In this study, the effects of each foil and nominal clearance on the static performance are developed experimentally. The optimal GFTB with higher capacity is obtained. The feasibility study of the proposed GFTB is carried out, which is installed on the ultra‐high‐speed centrifugal air compressor. The result shows that the proposed GFTB can run stably and efficiently in the full speed ring, and the high‐pressure ratio and large flow rate of the air compressor also can be ensured. The results play an important role in guiding the stable operation of centrifugal air compressors applied in hydrogen fuel cell vehicles (HFCVs).

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Tailoring of the bearing stiffness to enhance the performance of gas-lubricated bump-type foil thrust bearing

Cited by 22 publications

References 30 publications

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

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

Development and application of multiphysics simulation tools for foil thrust bearings operating with carbon dioxide

Performance investigation and feasibility study of novel gas foil thrust bearing for hydrogen fuel cell vehicles

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