Research on foil thermal features of hydrodynamic air foil bearing with the Three-dimensional heat transfer model

Jia, Huang; Hu, Nanrong; Yin, Bifeng; Zhou, Zeyuan; Xu, Bo

doi:10.1016/j.tsep.2023.101737

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…12 Extensive theoretical and experimental research has been conducted by scholars for a better understanding of thermal characteristics of foil bearings. [13][14][15][16] Andrés and Kim 17 established a two-dimensional TEHD coupling analysis model for bump foil journal bearings, considering material property variations and thermal expansion of bearing components. Lehn et al 18 proposed a threedimensional TEHD coupling model for bump foil thrust bearings, incorporating thrust plate thermal extension and cooling gas.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis and optimization of bionic cooling channels of gas foil thrust bearings

Zhao,

Yan,

Qiang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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Under high-temperature conditions, heat evacuation of foil bearing has a significant impact on bearing performance, including loading performance and reliability. During bearing operation, viscous dissipative heat in the lubricant gas film is the main source of heat generation. For foil bearings, enhancing the heat evacuation efficiency is essential to extend the bearing service life in high-temperature environments. For heat evacuation, foil-side cooling is a very effective method. For more in-depth analysis of thermal characteristics of the foil bearing, a three-dimensional (3D) thermal-elasto-hydrodynamic (TEHD) coupling model of multi-leaf thrust foil bearing (MLTFB) with cooling channel is established in this paper. In view of the good heat transfer performance and more uniform gas velocity distribution in bionic flow channels, various bionic cooling channels of foil bearings are proposed and the structural parameters are optimized. The effects of cooling channel type, cooling channel width, span ratio, cooling gas supply mode, and rotational speed on the thermal and loading performance of foil bearings are investigated. The studies demonstrate that the spider net round cooling channel exhibits higher heat transfer performance and improved uniformity of temperature. Compared to the cooling gas supply from inner edge, the cooling gas supply from the outer edge proves to be more effective. The maximum temperature of lubricant gas film can be greatly reduced with wider cooling channels and a smaller channel span at the outer edge. The maximum temperature of lubricant gas film and bearing load are reduced as the Reynolds number of cooling gas increases. There exists an optimal Reynolds number that can achieve the highest uniformity of temperature.

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Section: Introductionmentioning

confidence: 99%

Thermal analysis and optimization of bionic cooling channels of gas foil thrust bearings

Zhao,

Yan,

Qiang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…In addition, the effect of the rarefied gas [13] and viscous dissipation [21] was also explored to describe the flow features accurately in GFJB. However, all numerical research above can not avoid solving the compressible Reynolds lubrication equation, except for the semi-analytical solution [25] or three-dimensional (3D) fluid-solid coupling simulation [26]. Thus, an appropriate solution is needed in engineering practices to balance the computational cost and accuracy [19] of GFJB, which also applies to TFJB.…”

Section: Introductionmentioning

confidence: 99%

Analysis of misalignment characteristics for textured foil journal bearing based on multigrid method

Xu,

Zhang,

Han

et al. 2023

Surf. Topogr.: Metrol. Prop.

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Surface texturing is an excellent solution to the load capacity deficiency of foil journal bearings. However, it will also introduce significant discretization efforts. This paper explored the possibility of searching the static balance locus of textured foil journal bearing using the multigrid method to ensure design efficiency. The modified Reynolds equation characterized the ultra-thin gas film behavior inside bump-type foil bearing, and two foil models were adopted simultaneously to obtain the foil’s structural deflection. The predicted load capacity agreed well with the experimental data. The results indicate that multigrid can accelerate the solution process of the compressible pressure governing equation, and the speed can be increased up to 70% when the nonlinear discretization scheme is adopted. It is recommended that textures are located in the pressure-rising region along the shaft’s rotating direction and that the axial direction is fully textured to improve load capacity. Moreover, the above texture distribution scheme can increase the tolerable maximum misalignment angle by 11.8% and enhance the stability of rotors operated in light-load and high-speed cases.

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Thermal failure optimization of foil thrust bearings

Xiong,

Xu,

et al. 2024

International Journal of Mechanical Sciences

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Research on foil thermal features of hydrodynamic air foil bearing with the Three-dimensional heat transfer model

Cited by 4 publications

References 15 publications

Thermal analysis and optimization of bionic cooling channels of gas foil thrust bearings

Thermal analysis and optimization of bionic cooling channels of gas foil thrust bearings

Analysis of misalignment characteristics for textured foil journal bearing based on multigrid method

Thermal failure optimization of foil thrust bearings

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