Comparative test on two kinds of new compliant foil bearing for small cryogenic turbo-expander

Hou, Yu; Zhu, Ziliang; Chen, C.Z

doi:10.1016/j.cryogenics.2003.08.002

Cited by 46 publications

(25 citation statements)

References 2 publications

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“…Table 1. Foil-bearing structure and parameters of lubricating gas [9] Name Value Bearing radius R (m) 50×10…”

Section: Model Parametersmentioning

confidence: 99%

“…Hence, this bearing is widely utilized. Gas bearing also presents low gas-film stiffness, small bearing capacity, and limited applicability (suitable for small turbo expanders only) [7][8][9] . The literature [10] recommends replacing the fan brake of a turbo expander with a booster and supplying pressurized gas to the gas bearing to enhance the environmental pressure at both ends of the bearing.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of environmental pressure on dynamic characteristics of aerodynamic gas bearing of boost turbo expander

Li¹,

Liu²,

Li³

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Improvement of the environmental pressure of gas bearing can enhance the load capacity of dynamic gas bearing. This study analyzes the effect of environmental pressure on the dynamic characteristics of a bump foil gas aerodynamic bearing. Results show that an increase in the environmental pressure enhances the direct dynamic stiffness Kxx and Kyy and the direct dynamic damping Dxx and Dyy of gas film. The direct stiffness Kxx and Kyy and direct damping Dxx and Dyy of gas film increase with the increase of the environmental pressure of gas bearing. The load capacity of bearing is related to the direct stiffness of gas film. Therefore, the direct stiffness Kyy can be increased by increasing the environmental pressure of gas bearing, consequently improving the load capacity of the bearing.

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“…Table 1. Foil-bearing structure and parameters of lubricating gas [9] Name Value Bearing radius R (m) 50×10…”

Section: Model Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of environmental pressure on dynamic characteristics of aerodynamic gas bearing of boost turbo expander

Li¹,

Liu²,

Li³

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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show abstract

“…Foil stiffness has been increased by constructing number of copper wires fixed behind the foil which results in high stability. Hou et al [16] have proposed the same construction of the foil for a small cryogenic turboexpander used in Brayton cycle. In this paper the only difference is that the copper wires are replaced by a whole rectangular elastic material and the foil element is wrapped around the journal only on the circumference in order to avoid the flaw that the stiffness of foil element is not equal.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Gas Foil Bearing with Different Foil Pivot Configuration

Patil

Kalita

Kakoty

2013

Advances in Mechanical Engineering

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A numerical model is developed in order to find out the performance characteristics of gas foil bearings. The static performance analysis of gas foil bearings has been carried out using an elastic foundation model of the foil. The steady state results have been compared with the experimental and theoretical results available in the literature. The characteristics of the bearing have been investigated with change in foil pivot position. It has been shown that the load carrying capacity is different for different foil pivot positions. Besides effect of bearing parameters like eccentricity ratio, length to diameter ratio, compliance coefficient, and bearing number on the load carrying capacity with different foil pivot positions have been studied.

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“…Gas foil bearing, as an alternative, is a kind of gas bearing using pieces of metal foil as support. It is outperformed for high speed [3], higher reliability [4], soft failure [5], and extreme temperature adaptability [6,7], as well as high levels of misalignment tolerance [8]. Additionally, aerodynamic lubrication using process gas in high speed operation is in favor of system conciseness and compactness.…”

Section: Introductionmentioning

confidence: 99%

“…Two kinds of journal bearings, copper wire support and viscoelastic support, were compared for small cryogenic turboexpander of 12 mm diameter around 220000 rpm [6]. Recently, bump foil journal bearings was applied in the above turboexpander that could operate smoothly in a wide speed range [25].…”

Section: Introductionmentioning

confidence: 99%

Development and Application of Integrated Aerodynamic Protuberant Foil Journal and Thrust Bearing in Turboexpander

Lai

Guo

Wang

et al. 2017

International Journal of Rotating Machinery

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Foil bearing provides compliant support and moderate Coulomb friction for rotor-bearing system, which is conducive to stability and reliability of high speed rotating machinery. In this paper, both hydrodynamic lubricated foil journal and foil thrust bearings are applied in a 150 m 3 ⋅h −1 turboexpander for air separation. In the bearings, protuberant foil is chosen as the supporting subfoil due to its merits of easy fabrication and assembly. Static loading and deflection of the bearings are tested, respectively, before integration into the turboexpander. Afterwards, the loading and deflection curves of the journal and thrust bearings are polynomial fitted using least-square method. Then, performance tests are carried out on the rotor-bearing system, including transient speed-up, high speed, and speed-down processes. In the tests, the turboexpander supported by the hydrodynamic foil bearings operates smoothly with repeatability. Maximal rotor speed of the turboexpander reaches 52000 rpm with hydrodynamic lubricated protuberant foil bearings.

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Comparative test on two kinds of new compliant foil bearing for small cryogenic turbo-expander

Cited by 46 publications

References 2 publications

Effect of environmental pressure on dynamic characteristics of aerodynamic gas bearing of boost turbo expander

Effect of environmental pressure on dynamic characteristics of aerodynamic gas bearing of boost turbo expander

Performance Analysis of Gas Foil Bearing with Different Foil Pivot Configuration

Development and Application of Integrated Aerodynamic Protuberant Foil Journal and Thrust Bearing in Turboexpander

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