Research Papers: Gas Turbines: Structures and Dynamics

Integrated Three-Dimensional Thermohydrodynamic Analysis of Turbocharger Rotor and Semifloating Ring Bearings

[+] Author and Article Information
Feng Liang

School of Aerospace Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: lfeng33333@126.com

Yajing Li

School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China
e-mail: lee_kmust@qq.com

Ming Zhou

School of Aerospace Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: zmzlh@tsinghua.edu.cn

Quanyong Xu

School of Aerospace Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: xuquanyong@tsinghua.edu.cn

Farong Du

School of Energy and Power Engineering,
Beihang University,
Beijing 100191, China
e-mail: dfr_buaa16@sina.com

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 3, 2016; final manuscript received December 18, 2016; published online March 21, 2017. Assoc. Editor: Philip Bonello.

J. Eng. Gas Turbines Power 139(8), 082501 (Mar 21, 2017) (10 pages) Paper No: GTP-16-1099; doi: 10.1115/1.4035735 History: Received March 03, 2016; Revised December 18, 2016

The mechanical performances of turbocharger rotor bearings system are strongly coupled with the thermal effects of lubrication. This paper built an integrated three-dimensional thermohydrodynamic model for the rotor and semifloating ring bearings. The thermal viscosity and non-Newtonian effects of lubricant oil are involved. Three experimental cases with different oil supply temperatures and pressures are conducted to validate the numerical results. The prediction coincides well with the measured results. Subsynchronous responses jumping between the conical and cylindrical mode shapes happens. The thermal results show that the heat conduction and expansion of the solid parts can affect the temperature fields and clearances of the oil films. Furthermore, for the bearings with axial grooves, the underdeveloped thermal boundary layers exist in the inner film at high rotational speed. The complexity and heterogeneity of the oil film temperature and viscosity reveal the essentiality and significance of the three-dimensional thermohydrodynamic analysis.

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Fig. 1

Rotor supported by SFRB (rotor-SFRB)

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Fig. 2

Turbocharger test facilities: (a) configuration of the SFRBs and rotor, (b) rapping test for the rotor, and (c) vibration test for the rotor-SFRBs

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Fig. 3

The diagrammatic mesh of oil film: (a) 2D mesh and (b) 3D mesh (the film clearance is exaggerated)

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Fig. 4

The FE mesh of the rotor and ring

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Fig. 5

The first two free–free modes of the rotor

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Fig. 6

The waterfall plots of the rotor: (a), (c), (e) the experimental results of case 1, 2, 3; (b), (d), (f) the predicted results of case 1, 2, 3

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Fig. 7

The subsynchronous frequencies of the rotor vibration: (a) case 1, (b) case 2, and (c) case 3

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Fig. 8

Temperature of the journals and ring of case 1: (a) at comp. side and (b) at turb. side

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Fig. 9

The percentages of clearances changing compared with those at the 20 °C, solid and dashed line represent positive and negative value, respectively. These data are from the simulation results of case 1.

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Fig. 10

The bending modes evolvement in case 3

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Fig. 11

The predicted heat transfer and flow of case 1 at 160 krpm

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Fig. 12

The temperature field in the turb. side inner film at 160 krpm of case 1, unit: (°C). (a) Thickness average temperature (x–y), (b) temperature filed in slice plane (y–z), (c) temperature filed in slice plane (x–z), and (d) viscosity field in slice plane (x–z), unit: (cP).



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