0
Research Papers: Hydrodynamic Lubrication

Numerical Investigation of Air–Oil–Thermal Coupling Mechanism in Floating Ring Bearings

[+] Author and Article Information
Wang Yan

Key Laboratory for Thermal Science and Power
Engineering of Ministry of Education,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: brucewanglegend@foxmail.com

Ren Xiao-Dong

Key Laboratory for Thermal Science and Power
Engineering of Ministry of Education,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: rxd@mail.tsinghua.edu.cn

Li Xue-Song

Key Laboratory for Thermal Science and Power
Engineering of Ministry of Education,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: xs-li@mail.tsinghua.edu.cn

Gu Chun-Wei

Key Laboratory for Thermal Science and Power
Engineering of Ministry of Education,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: gcw@mail.tsinghua.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 2, 2017; final manuscript received September 13, 2017; published online October 23, 2017. Assoc. Editor: Daejong Kim.

J. Tribol 140(3), 031701 (Oct 23, 2017) (10 pages) Paper No: TRIB-17-1120; doi: 10.1115/1.4038099 History: Received April 02, 2017; Revised September 13, 2017

Floating ring bearings (FRBs) are widely used in automobile turbochargers. However, there is no satisfying explanation of phenomenon that ring rotation speed levels off when the shaft speed reaches a certain value under low oil-supplied pressure condition. The traditional opinion that effective viscosity decreases with increasing temperature cannot completely explain this phenomenon. In this study, the air entrainment effect is introduced and evaluated using computational fluid dynamics (CFD). CFD results considering air entrainment, viscous heating, and heat transfer are compared with experimental results to evaluate each effect. The decrease in effective viscosity as a result of air–oil–thermal coupling effect is the mechanism behind the abovementioned phenomenon. This study provides calculated data and visual results of the air entrainment in low oil-supplied pressure FRB.

Copyright © 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Hatakenaka, K. , and Yanai, H. , 2008, “ Stability in High-Speed Floating Bush Journal Bearings at Low Supplied Pressure—Part 1: Effect of Oil Groove and Holes Into Inner Oil Film and Slope at Bush Inner Side End on Stability,” J. Japn. Soc. Tribol., 53(8), pp. 536–543.
San Andres, L. , and Kerth, J. , 2004, “ Thermal Effect on the Performance of Floating Ring Bearings for Turbochargers,” J. Eng. Tribol., 218(J5), pp. 437–450.
Porzig, D. , Raetz, H. , Schwarze, H. , and Seume, J. R. , 2014, “ Thermal Analysis of Small High-Speed Floating-Ring Journal Bearings,” 11th International Conference on Turbochargers and Turbocharging, London, May 13–14, pp. 421–436.
Schweizer, B. , 2010, “ Dynamics and Stability of Turbocharger Rotors,” Arch. Appl. Mech., 80(9), pp. 1017–1043. [CrossRef]
Kohl, W. , Kreschel, M. , and Filsinger, D. , 2014, “ Experimental and Numerical Investigations on an Automotive Turbocharger With a Transparent Bearing Section,” 11th International Conference on Turbochargers and Turbocharging, London, May 13–14, pp. 349–359.
Kirk, R. G. , Mondschein, B. , Alsaeed, A. A. , Gallimore, D. , Framk, A. , Crouch, J. , Tiller, M. , Vo, T. , Thrush, K. , and Lloyd, R. , 2010, “Influence of Turbocharger Bearing Design on Observed Linear and Nonlinear Vibration,” ASME Paper No. IJTC2010-41021.
Boyaci, A. , Hetzler, H. , Seemann, W. , Proppe, C. , and Wauer, J. , 2009, “ Analytical Bifurcation Analysis of a Rotor Supported by Floating Ring Bearings,” Nonlinear Dyn., 57(4), pp. 497–507. [CrossRef]
Schweizer, B. , 2009, “ Oil Whirl, Oil Whip and Whirl/Whip Synchronization Occurring in Rotor Systems With Full-Floating Ring Bearings,” Nonlinear Dyn., 57(4), pp. 509–532. [CrossRef]
Kirk, R. G. , Komhauser, A. A. , Sterling, J. , and Alsaeed, A. , 2010, “ Turbocharger On-Engine Experimental Vibration Testing,” J. Vib. Control, 16(3), pp. 343–355. [CrossRef]
Tatara, A. , 1970, “ An Experimental Study of the Stabilizing Effect of Floating-Bush Journal Bearings,” Bull. JSME, 13(61), pp. 858–863. [CrossRef]
Song, Y. , Gu, C. W. , and Ren, X. , 2015, “ Development and Validation of a Gaseous Cavitation Model for Hydrodynamic Lubrication,” J. Eng. Tribol., 229(10), pp. 1227–1238.
Song, Y. , Li, X. S. , and Gu, C. , 2010, “ Cavitation Model for Oil Film Bearings,” J. Tsinghua Univ., 50(7), pp. 1047–1052.
Li, X. S. , Song, Y. , Hao, Z. R. , and Gu, C. W. , 2012, “ Cavitation Mechanism of Oil-Film Bearings and Development of a New Gaseous Cavitation Model Based on Air Solubility,” ASME J. Tribol., 134(3), p. 031701. [CrossRef]
Orcutt, F. K. , and Ng, C. W. , 1968, “ Steady-State and Dynamic Properties of the Floating-Ring Journal Bearing,” ASME J. Lubr. Technol., 90(1), pp. 243–253. [CrossRef]
Trippett, R. J. , 1986, “ Measured and Predicted Friction in Floating-Ring Bearings,” SAE Paper No. 860075.
Trippett, R. J. , and Li, D. F. , 1984, “ High-Speed Floating-Ring Bearing Test and Analysis,” ASLE Trans., 27(1), pp. 73–81. [CrossRef]
San Andres, L. , Rivadeneira, J. C. , Gjika, K. , Groves, C. , and LaRue, G. , 2007, “ Rotordynamics for Small Turbochargers Supported on Floating Ring Bearings-Highlights in Bearing Analysis and Experimental Validation,” ASME J. Tribol., 129(2), pp. 391–397. [CrossRef]
Clarke, D. M. , Fall, C. , Hayden, G. N. , and Wilkinson, T. S. , 1992, “ A Steady-State Model of a Floating Ring Bearing, Including Thermal Effects,” ASME J. Tribol., 114(1), pp. 141–149. [CrossRef]
Tsuda, K. , and Takahashi, T. , 1985, “ Observation of Oil Film Disappearance Between Shaft and Fast Rotating Bush Lubricated From Outside,” J. Jpn. Soc. Lubr. Eng., 30(1), pp. 69–72.
Koeneke, C. E. , Tanaka, M. , and Motoi, H. , 1995, “ Axial Oil Film Rupture in High Speed Bearings Due to the Effect of the Centrifugal Force,” ASME J. Tribol., 117(3), pp. 394–398. [CrossRef]
Hatakenaka, K. , Tanaka, M. , and Suzuki, K. , 2002, “ A Theoretical Analysis of Floating Bush Journal Bearing With Axial Oil Film Rupture Being Considered,” ASME J. Tribol., 124(3), pp. 494–505. [CrossRef]
Hatakenaka, K. , Kasahara, K. , and Ishibashi, N. , 2008, “ Bush Driving Torque in Inner Oil Film of Floating Bush Journal Bearings With Numerical Analysis for Multi-Phase Flow Being Applied,” J. Jpn. Soc. Tribol., 53(9), pp. 612–620.
San Andres, L. , and Diaz, S. E. , 2003, “ Flow Visualization and Forces From a Squeeze Film Damper Operating With Natural Air Entrainment,” ASME J. Tribol., 125(2), pp. 325–333. [CrossRef]
Renn, J. C. , and Hsiao, C. H. , 2004, “ Experimental and CFD Study on the Mass Flow-Rate Characteristic of Gas Through Orifice-Type Restrictor in Aerostatic Bearings,” Tribol. Int., 37(4), pp. 309–315. [CrossRef]
Gao, G. Y. , Yin, Z. W. , Jiang, D. , Zhang, X. L. , and Wang, Y. Z. , 2016, “ Analysis on Design Parameters of Water-Lubricated Journal Bearings Under Hydrodynamic Lubrication,” J. Eng. Tribol., 230(8), pp. 1019–1029.
Song, Y. , and Gu, C. W. , 2015, “ Development and Validation of a Three-Dimensional Computational Fluid Dynamics Analysis for Journal Bearings Considering Cavitation and Conjugate Heat Transfer,” ASME J. Eng. Gas Turbines Power, 137(12), p. 122502. [CrossRef]
Zhang, Y. , Sun, X. , and Huang, D. , 2010, “ A Numerical Study on Cavitation Suppression Using Local Cooling,” Int. J. Fluid Mach. Syst., 3(4), pp. 292–300. [CrossRef]
Wang, Y. , Sun, X. J. , Dai, Y. J. , Wu, G. Q. , Cao, Y. , and Huang, D. G. , 2015, “ Numerical Investigation of Drag Reduction by Heat-Enhanced Cavitation,” Appl. Therm. Eng., 75(22), pp. 193–202. [CrossRef]
Huang, D. G. , and Zhuang, Y. Q. , 2008, “ Temperature and Cavitation,” J. Mech. Eng. Sci., 222(2), pp. 207–211. [CrossRef]
Song, Y. , Ren, X. , Gu, C. W. , and Li, X. S. , 2014, “ Experimental and Numerical Studies of Cavitation Effects in a Tapered Land Thrust Bearing,” ASME J. Tribol., 137(1), p. 011701. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

Structure of the FRBs

Grahic Jump Location
Fig. 2

Division of the fluid domain

Grahic Jump Location
Fig. 3

Mesh of the fluid domain: (a) outer film, (b) inner film, and (c) ring hole

Grahic Jump Location
Fig. 4

Traditional model pressure distribution: (a) entire domain and (b) inner film

Grahic Jump Location
Fig. 5

Ring speed change with shaft speed

Grahic Jump Location
Fig. 6

Viscous heating average temperature

Grahic Jump Location
Fig. 7

Viscous heating temperature distribution: (a) entire domain and (b) inner film

Grahic Jump Location
Fig. 8

Viscous heating middle plane surface streamline

Grahic Jump Location
Fig. 9

Air entrainment air volume fraction distribution: (a) entire domain, (b) shaft surface, (c) ring inner surface, and (d) ring outer surface

Grahic Jump Location
Fig. 10

Ring speed change with shaft speed

Grahic Jump Location
Fig. 11

Combined effect air volume fraction distribution: (a) entire domain, (b) shaft surface, (c) ring inner surface, and (d) ring outer surface

Grahic Jump Location
Fig. 12

Combined effect temperature distribution: (a) entire domain and (b) inner film

Grahic Jump Location
Fig. 13

Combined effect average temperature: (a) volume-averaged temperature change and (b) surface-averaged temperature change

Grahic Jump Location
Fig. 14

Ring speed change with shaft speed

Grahic Jump Location
Fig. 15

Air volume fraction at different shaft speeds: (a) entire domain, (b) shaft surface, (c) ring inner surface, and (d) ring outer surface

Grahic Jump Location
Fig. 16

Average temperature of each film

Grahic Jump Location
Fig. 17

Ring speed change with shaft speed

Grahic Jump Location
Fig. 18

Torque on the ring

Grahic Jump Location
Fig. 19

Effective viscosity change under each effect

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In