Numerical and experimental studies on the thermal and static characteristics of multi-leaf foil thrust bearing

Guo, Yu; Hou, Yu; Zhao, Qi; Ren, Xionghao; Chen, Shuangtao; Lai, Tianwei

doi:10.1177/13506501211011019

Cited by 7 publications

(10 citation statements)

References 32 publications

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“…The effect of temperature on FTB with respect to operating speed and applied pre-load or static-load was determined by Liu and others [9] with a k-type thermocouple placed on top foils. Likewise the effect of pressurized cooling air at higher temperatures enhances the bearing axial loads as depicted by Yu Guo et al [10] for higher speeds (up to 120,000 rpm) and ever before by Dykas and Prahl [11] for lower speeds (up to 55,000 rpm). A vertical bearing test rig developed by Kim and Park [12] examined the torque, temperature, and pressure on the GFTB for an applied static load at speeds ranging up to 25,000 rpm.…”

Section: Introductionmentioning

confidence: 77%

Parametric Studies on Performance of Oil-Free Thrust Foil Bearings at Lower Speeds

Shivakumar¹,

Raju²,

Ravikuma³

et al. 2023

Tribol. Ind.

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The present work involves an experimental analysis on gas-lubricated foil thrust bearing (FTB) that has major applications in food processing units at lower operating speeds. Parametric studies include testing thrust foil bearings with various foil configurations in terms of foil thickness, foil geometry, and foil material. Novel bearing testing apparatus designed and fabricated for the purpose supported a larger diameter (224 mm) thrust foil bearing, operated at speeds ranging from 10,000 rpm to 18,000 rpm. Performance of air foil thrust bearing (AFTB) concerning static structural stiffness and load bearing capability was determined in optimizing the best foil configuration. A novel dimensionless number was formulated that emphasizes the affecting factors of thrust foil bearing with respect to axial loads.

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Section: Introductionmentioning

confidence: 77%

Parametric Studies on Performance of Oil-Free Thrust Foil Bearings at Lower Speeds

Shivakumar¹,

Raju²,

Ravikuma³

et al. 2023

Tribol. Ind.

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“…To validate the numerical model, boundary condition settings are employed, which is consistent with experimental conditions in literature. 19 The boundary conditions are outlined in Table 2. The upper surface of lubricant film is assigned a no-slip boundary condition, and the heat transfer condition is defined as forced convection.…”

Section: Physical and Numerical Modelmentioning

confidence: 99%

“…The accuracy of the 3D thermal-elasto-hydrodynamic coupling model of the MLTFB is verified by comparing the data with the literature. 19 The comparison of load capacity at various bearing clearances is depicted in Figure 3. The bearing loads obtained from the numerical calculation agree well with the experimental test data, indicating the reliability and validity of the mathematical model.…”

Section: Physical and Numerical Modelmentioning

confidence: 99%

“…The results revealed that at high rotational speeds, the bearing load is weakened due to thermal deflection of the thrust plate. Guo et al 19 developed a two-dimensional TEHD analysis model for multi-leaf bearings and conducted experimental investigations on cooling gas's impact on bearing heat evacuation. It demonstrated that there was a significant decrease in temperature on the back of the foil with the introduction of cooling gas.…”

Section: Introductionmentioning

confidence: 99%

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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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“…The rotor-bearing system can still maintain good stability even with impulsive loads or unstable whirling motion. 9 In respective of supporting structures of foil bearings, there are bump type, multi-leaf type and protuberant type, etc.. [10][11][12] Among them, the bump foil bearing is the most widely used and has been commercialized in many fields. The foil bearing can be sorted into three generations according to the circumferential and axial partitions and compliance.…”

Section: Introductionmentioning

confidence: 99%

Frictional analysis on stiffness and damping characteristics of bump foil gas bearings

Zhao

Qiang

Yan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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Gas foil bearing has been used in high-speed turbomachinery for its high speed, high adaptability, and eco-friendly. The stability of the rotor bearing system is greatly enhanced due to the flexible foil support structure. In the foil supporting structure, vibration energy of the rotor bearing system can be absorbed by the Coulomb friction dissipation. In order to evaluate the frictional dissipation on bearing performance, a quasi-2-dimensional mechanical model is proposed considering the Coulomb friction. The Coulomb damping dissipation characteristics of the bearing in operating conditions are analyzed by coupling gas film. Frictional analysis is conducted on the bump foil bearing with different structural parameters, such as bump height, foil thickness, friction coefficient and number of bump foil strips. The stiffness of the foil bump is less affected by the base load. In the process of foil bearing design, the optimal friction coefficient, bump height should be properly selected in favor of either foil bearing stiffness or damping characteristics. In addition, the overall performance of bump foil bearing is strongly affected by the number of bump foil strips.

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Numerical and experimental studies on the thermal and static characteristics of multi-leaf foil thrust bearing

Cited by 7 publications

References 32 publications

Parametric Studies on Performance of Oil-Free Thrust Foil Bearings at Lower Speeds

Parametric Studies on Performance of Oil-Free Thrust Foil Bearings at Lower Speeds

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

Frictional analysis on stiffness and damping characteristics of bump foil gas bearings

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