Experimental Investigation on the Multi-Decked Protuberant Gas Foil Journal Bearing

Hou, Yu; Lai, Tianwei; Ma, Bo; Zheng, Yueqing; Chen, Shuangtao

doi:10.1299/jamdsm.7.791

Cited by 6 publications

(10 citation statements)

References 25 publications

(21 reference statements)

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“…Then, the same research group experimentally studied the effects of bearing clearance and supporting stiffness of the foil journal bearing with multi-decked protuberant configuration. In application tests on a 25mm-diameter turboexpander around 100 krpm, subsynchronous Preliminary experimental study on static loading characteristics of multi-decked protuberant foil thrust bearing Tianwei LAI*, Shuangtao CHEN*, Bin MA*, Liqiang LIU** and Yu HOU* vibration was suppressed quite well (Hou, et al, 2013;Lai, et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Preliminary experimental study on static loading characteristics of multi-decked protuberant foil thrust bearing

Lai

Chen

et al. 2016

JAMDSM

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In the fluid film lubrication of high speed turbomachinery, bearing performance plays a significant role in the dynamics of the rotor-bearing system. In this paper, a novel foil thrust bearing using multi-decked protuberant foils as supporting structure is developed and tested. Experimental bearing test rig using gas-driven high speed turbo-expander is set up to evaluate static loading characteristics of the bearing. Static stiffness, friction torque, nominal bearing clearance and axial vibration amplitude are discussed in the transient processes. Static loading characteristic of the bearing is evaluated based on the relationship between displacement and loading force. Test results indicate that this simply configured thrust bearing has a good prospect in high speed hydrodynamic lubrication.

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Section: Introductionmentioning

confidence: 99%

Preliminary experimental study on static loading characteristics of multi-decked protuberant foil thrust bearing

Lai

Chen

et al. 2016

JAMDSM

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“…By virtue of the transient performances of the protuberant foil journal and thrust bearings [27][28][29][30], they are considered to be alternative candidates for the rotor-bearing system. In this paper, both the aerostatic journal and thrust bearings are replaced by protuberant foil bearings based on the previous configuration of the rotor-bearing system.…”

Section: Bearing Configurationsmentioning

confidence: 99%

“…Numerical results indicated that the journal bearing was stable in high speed range [26]. Subsynchronous vibrations were suppressed quite well [27,28]. Static structure stiffness and load capacities of the thrust bearing were tested in transient start-up and speed-down processes [29,30].…”

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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“…Dues to the near rigid support stiffness of the elastic foil, the damage happened to the top plate foil in the experiment. Therefore, Hou and Lai designed a double-layer protuberant gas foil journal bearing (Hou and Lai, et al 2013). The new structure run well in a  25 mm shaft turboexpander, and the maximum speed reached 100,000 rpm (linear speed of the outer edge of the expansion wheel was about 191 m/s).…”

Section: Introductionmentioning

confidence: 99%

“…where c (Hou and Lai, et al 2013) is the bearing clearance, and e is the eccentricity. w is the transverse deflection of the top foil structure due to the hydrodynamic pressure of the fluid film.…”

Section: Introductionmentioning

confidence: 99%

Study on double-layer protuberant gas foil journal bearings with different foil layers arrangement

Chen

Hou

Niu

et al. 2015

JAMDSM

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With the excellent damping performance, gas foil bearing (GFB) is becoming the promising hydrodynamic lubrication structure for high speed turbomachinery. To improve the performance of the conventional GFBs, a new double-layer gas foil bearing (PGFB) with double-layer protuberant strip as elastic support is developed. A 2D numerical model based on Reynolds equation and Kirchhoff equation is established to determine the gas film thickness, gas film pressure and foil deflection. Static performance and dynamic performance of three PGFBs with different elastic foil layers arrangement are presented and compared qualitative dues to the difficulties in measuring the practice eccentricity and load capacity with high speed rotor-bearing system. By applying in a turboexpander with  25mm rotor diameter, the three PGFBs are tested. Because the three PGFBs share the same rotor structure and the same air supply pressure, the rotor drag torque and the bearing static load are almost the same in the tests. The experimental results show that all the PGFBs run well in turboexpander. Rotating speed, temperature and enthalpy differences and rotor synchronous vibration under the same turboexpander air supply pressure are compared. The numerical model predicted well the qualitative difference of the loading performance of the three PGFBs.

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Experimental Investigation on the Multi-Decked Protuberant Gas Foil Journal Bearing

Cited by 6 publications

References 25 publications

Preliminary experimental study on static loading characteristics of multi-decked protuberant foil thrust bearing

Preliminary experimental study on static loading characteristics of multi-decked protuberant foil thrust bearing

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

Study on double-layer protuberant gas foil journal bearings with different foil layers arrangement

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