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Research Papers: Gas Turbines: Structures and Dynamics

Performance Analysis of Oil Lubricated Foil Bearing With Flexible Supported Back Spring Structure—Part I: Model Development and Numerical Investigation

[+] Author and Article Information
Guanghui Zhang

Assistant Professor
Harbin Institute of Technology,
School of Energy Science and Engineering,
Mailbox 458, No. 92, Xi-Dazhi Street,
NanGang District, Harbin,
HeiLongjiang Province 150001, China
e-mail: zhanggh@hit.edu.cn

Xie Liang, Yu Wang, Zhansheng Liu

Harbin Institute of Technology,
Mailbox 458, No. 92, Xi-Dazhi Street,
NanGang District, Harbin,
HeiLongjiang Province 150001, China

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received May 9, 2013; final manuscript received April 3, 2014; published online May 16, 2014. Assoc. Editor: Patrick S. Keogh.

J. Eng. Gas Turbines Power 136(11), 112501 (May 16, 2014) (10 pages) Paper No: GTP-13-1125; doi: 10.1115/1.4027602 History: Received May 09, 2013; Revised April 03, 2014

A new type of multileaf oil lubricated foil bearing with flexible supported back spring structure was proposed to satisfy the requirement of high rotating velocity for turbo pump, where the rotor was submerged in the hydraulic oil. The numerical analysis was carried out in this paper. Based on the structure of oil foil bearing, the film thickness model was established without foil deformation. By employing Castigliano's theorem, the total flexibility matrix including the elastic back spring and cantilevered curved beam was calculated, and then compared with commercial finite element software to verify the accuracy of the proposed model. The obtained flexibility matrix was brought into the static and dynamic oil lubricated Reynolds equation. The Reynolds boundary condition was considered to simulate the oil film rupture effect. The deformation equation for the structure and the Reynolds equation were solved coupled by the successive over relaxation method. The static and dynamic characteristics of the oil lubricated multileaf foil bearing with supported back spring were acquired. The effect of the foil thickness on the load capacity was discussed. The variation of the dynamic coefficients with bearing load was acquired. By employing Routh–Hurwitz method, the stability of the bearing was analyzed. The results indicated that the load capacity of the foil bearing with back supported spring was bigger than that of the foil bearing without back supported spring. The stability characteristics of the foil bearing with back supported structure was better than traditional rigid self-acting bearing, particular for the high rotating speed case.

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References

Figures

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Fig. 1

Structure of multileaf foil bearing with back supported spring

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Fig. 2

Geometrical description for single foil

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Fig. 3

Schematic diagram of foil deformation

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Fig. 4

Schematic of the static characteristics for the foil bearing with back supported spring

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Fig. 5

The oil film pressure distribution of multileaf foil bearing with back supported spring

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Fig. 6

The static equilibrium position locus of the shaft for the multileaf foil bearing with supported back spring

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Fig. 7

variation of the stiffness coefficients with nominal Sommerfeld coefficient

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Fig. 8

variation of the damping coefficients with nominal Sommerfeld coefficient

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Fig. 9

variation of stiffness with Sommerfeld coefficient for different combinations of viscosity and load

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Fig. 10

variation of damping with Sommerfeld coefficient for different combinations of viscosity and load

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Fig. 11

variation of stiffness with Sommerfeld coefficient for different bearing load

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Fig. 12

variation of stiffness with Sommerfeld coefficient for different bearing load

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Fig. 13

Stability distribution diagram for foil bearing with back supported spring

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Fig. 14

Stability distribution diagram for rigid self-acting journal bearing

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