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Load characteristics and dynamic stability of hydrogen aerostatic gas bearings in turbo-expanders
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Chenjie GU1,2, Songqiang ZHU1, Zhenyu LIU2, Limin QIU3, Yutao LIU1, Kai FANG1, Jingfeng LI1. Load characteristics and dynamic stability of hydrogen aerostatic gas bearings in turbo-expanders[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .
@article{title="Load characteristics and dynamic stability of hydrogen aerostatic gas bearings in turbo-expanders",
author="Chenjie GU1,2, Songqiang ZHU1, Zhenyu LIU2, Limin QIU3, Yutao LIU1, Kai FANG1, Jingfeng LI1",
journal="Journal of Zhejiang University Science A",
volume="-1",
number="-1",
pages="",
year="1998",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2500531"
}
%0 Journal Article
%T Load characteristics and dynamic stability of hydrogen aerostatic gas bearings in turbo-expanders
%A Chenjie GU1
%A 2
%A Songqiang ZHU1
%A Zhenyu LIU2
%A Limin QIU3
%A Yutao LIU1
%A Kai FANG1
%A Jingfeng LI1
%J Journal of Zhejiang University SCIENCE A
%V -1
%N -1
%P
%@ 1673-565X
%D 1998
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2500531
TY - JOUR
T1 - Load characteristics and dynamic stability of hydrogen aerostatic gas bearings in turbo-expanders
A1 - Chenjie GU1
A1 - 2
A1 - Songqiang ZHU1
A1 - Zhenyu LIU2
A1 - Limin QIU3
A1 - Yutao LIU1
A1 - Kai FANG1
A1 - Jingfeng LI1
J0 - Journal of Zhejiang University Science A
VL - -1
IS - -1
SP -
EP -
%@ 1673-565X
Y1 - 1998
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2500531
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 three-dimensional 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.
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