Hydrogen and nitrogen turboexpanders with high gas expansion ratios

Davydenkov, I. A.; Davydov, A. B.; Perestoronin, G. A.

doi:10.1016/0011-2275(92)90115-q

Cited by 5 publications

(1 citation statement)

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“…At present, most of the research on turbo-expanders is carried out with air as the working medium [20]. Conversely, there have been few studies on hydrogen turboexpanders [21]. In the design process of cryogenic turbo-expanders, it is necessary to consider the influence of different lubricating media on the performance of gas-lubricated journal bearings.…”

Section: Introductionmentioning

confidence: 99%

Performance Prediction of High-Speed Hydrogen Gas-Lubricated Herringbone Grooved Journal Bearing

Qiang¹,

Zhao²,

Yan³

et al. 2022

Applied Sciences

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The liquefaction of hydrogen is considered to be a crucial process in the large-scale utilization of hydrogen energy. In hydrogen liquefaction, hydrogen turbo-expander is a key refrigerating machine for high liquefaction efficiency. Performance of the turbo-expander is directly affected by the hydrogen gas bearings. To obtain a deep understanding of the performance characteristics of hydrogen gas bearings, the static and dynamic characteristics of herringbone grooved journal bearings under hydrogen and other lubricating gases were numerically calculated and compared. The bearing load capacity and critical mass of hydrogen gas bearings were slightly lower than those of helium-, air- and nitrogen-lubricated bearings. To improve the performance of the hydrogen gas bearings used in high-speed turbo-machinery, the influence of working conditions was analyzed. It is found that the load capacity of hydrogen gas bearings can be improved by increasing the ambient pressure, reducing the gas film clearance, and raising the bearing eccentricity ratio. Meanwhile, the critical mass increases, and the bearing dynamic stability is enhanced.

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Section: Introductionmentioning

confidence: 99%