Abstract: Hydrogen-lubricated bearings are critical components of hydrogen turbo-expanders in large-scale hydrogen liquefaction systems. However, the low viscosity of hydrogen presents significant challenges to the bearing’s operational stability, and research on this topic remains limited. Therefore, we investigate the static characteristics of a hydrogen aerostatic gas bearing (HAGB) using a 3D computational fluid dynamics (CFD) model, comparing its performance with that of helium and air bearings. Our analysis reveals that the HAGB primarily operates under the influence of the hydrostatic effect, with its hydrodynamic effect being relatively weak due to hydrogen’s low viscosity. Moreover, the impact of the HAGB’s operational and structural parameters on its dynamic behavior is investigated. The dynamic stability is evaluated using the dissipated energy and the equivalent damping coefficient. The results indicate that the equivalent damping coefficient can be enhanced by increasing the rotational speed and supply pressure, as well as reducing the gas film clearance. Specifically, in the investigated configuration, the HAGB demonstrates optimal vibration damping when the inlet orifice diameter is 0.2 mm.

透平膨胀机中氢气静压气体轴承的承载特性与动态稳定性

[1]BarthelemyH, WeberM, BarbierF, 2017. Hydrogen storage: recent improvements and industrial perspectives. International Journal of Hydrogen Energy, 42(11):7254-7262.

[2]ChenSX, ZhangQY, FuB, et al., 2021. Analysis of static and dynamic characteristics of aerostatic bearing with reflux orifices. Industrial Lubrication and Tribology, 73(6):961-970.

[3]CuiW, 2022. Research on Static and Dynamic Characteristics and Flow Field Supersonic Characteristic of Micro-Groove-Orifice Aerostatic Journal Bearing Under High Gas Supply Pressure. PhD Thesis, Northeast Forestry University, Harbin, China(in Chinese).

[4]ElberryAM, ThakurJ, Santasalo-AarnioA, et al., 2021. Large-scale compressed hydrogen storage as part of renewable electricity storage systems. International Journal of Hydrogen Energy, 46(29):15671-15690.

[5]GaoQ, ChenWQ, LuLH, et al., 2019. Aerostatic bearings design and analysis with the application to precision engineering: state-of-the-art and future perspectives. Tribology International, 135:1-17.

[6]GaoQH, SunWJ, ZhangJZ, 2023. Prediction of aerodynamic and thermal performances for gas foil journal bearing with an axial cooling throughflow by machine learning method. Thermal Science and Engineering Progress, 44:102044.

[7]GaoSY, ChengK, ChenSJ, et al., 2015. CFD based investigation on influence of orifice chamber shapes for the design of aerostatic thrust bearings at ultra-high speed spindles. Tribology International, 92:211-221.

[8]GobbatoP, MasiM, ToffoloA, et al., 2011. Numerical simulation of a hydrogen fuelled gas turbine combustor. International Journal of Hydrogen Energy, 36(13):7993-8002.

[9]Incer-ValverdeJ, Patiño-ArévaloLJ, TsatsaronisG, et al., 2022. Hydrogen-driven Power-to-X: state of the art and multicriteria evaluation of a study case. Energy Conversion and Management, 266:115814.

[10]LaiTW, GuoY, ZhaoQ, et al., 2018. Numerical and experimental studies on stability of cryogenic turbo-expander with protuberant foil gas bearings. Cryogenics, 96:62-74.

[11]LeeD, LimH, KimB, et al., 2023. Rotordynamic analysis and operating test of an externally pressurized gas bearing turbo expander for cryogenic applications. Lubricants, 11(6):252.

[12]LiJ, 2018. Research on Static and Dynamic Characteristics of Bearing-Rotor System of Turbo-Expander in Cryogenic System. PhD Thesis, Huazhong University of Science and Technology, Wuhan, China(in Chinese).

[13]LiJ, YangSQ, LiXM, et al., 2018. Effects of surface waviness on the nonlinear vibration of gas lubricated bearing-rotor system. Shock and Vibration, 2018(1):8269384.

[14]LiuHM, ZuoJS, QiuS, et al., 2025. Simulative and experimental analysis of high-speed helium turbo-expanders in a 5t/day hydrogen liquefier. International Journal of Hydrogen Energy, 133:152-164.

[15]McDonaldCF, 2012. Helium turbomachinery operating experience from gas turbine power plants and test facilities. Applied Thermal Engineering, 44:108-142.

[16]NishioU, SomayaK, YoshimotoS, 2011. Numerical calculation and experimental verification of static and dynamic characteristics of aerostatic thrust bearings with small feedholes. Tribology International, 44(12):1790-1795.

[17]NohH, KangK, SeoY, 2023. Environmental and energy efficiency assessments of offshore hydrogen supply chains utilizing compressed gaseous hydrogen, liquefied hydrogen, liquid organic hydrogen carriers and ammonia. International Journal of Hydrogen Energy, 48(20):7515-7532.

[18]QiangMC, ZhaoQ, YanSH, et al., 2022. Performance prediction of high-speed hydrogen gas-lubricated herringbone grooved journal bearing. Applied Sciences, 12(13):6432.

[19]QiangMC, LiuMZ, ZhaoQ, et al., 2023. Feasibility analysis of adopting the hydrogen hydrostatic thrust bearing. Applied Sciences, 13(16):9372.

[20]QiuS, KeCL, LiKR, et al., 2025. Nonlinear dynamic analysis of a novel tangentially supplied aerostatic bearing-rotor system: theory and experiment. Mechanical Systems and Signal Processing, 224:112221.

[21]StaatsWL, 2008. Analysis of a Supercritical Hydrogen Liquefaction Cycle. MS Thesis, Massachusetts Institute of Technology, Cambridge, USA.

[22]WuJZ, 2022. Research on Dynamics Characteristics of Bearing-Rotor System of Hydrogen Turbo-Expander. MS Thesis, China Academy of Launch Vehicle Technology, Beijing, China(in Chinese).

[23]YanH, KeCL, PengN, et al., 2021. Performance prediction of externally pressurized gas bearings for high-speed turbo-expander involving hydrogen, helium and air working fluids. International Journal of Hydrogen Energy, 46(67):33453-33467.

[24]ZhouKM, LiSF, ZhaoK, et al., 2022. Efficiency control of the cooling-down process of a cryogenic helium turbo-expander for a 2 t/d hydrogen liquefier. International Journal of Hydrogen Energy, 47(69):29794-29807.

[25]ZhouKM, ZhaoK, ChenL, et al., 2024. High-efficiency control strategies of a hydrogen turbo-expander for a 5 t/d hydrogen liquefier. Energy, 297:131326.

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