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Research Papers: Hydrodynamic Lubrication

Numerical Study on the Tribological Performance of Ring/Liner System With Consideration of Oil Transport

[+] Author and Article Information
Cheng Liu

Key Laboratory of Manufacturing
Equipment of Shaanxi Province,
Xi'an University of Technology,
Xi'an 710048, China;
State Key Laboratory of Digital Manufacturing
Equipment and Technology,
Huazhong University of
Science and Technology,
Wuhan 430074, China
e-mail: liucheng123995@163.com

Yanjun Lu

Key Laboratory of NC Machine Tools &
Integrated Manufacturing Equipment of the
Ministry of Education of China,
Xi'an University of Technology,
Xi'an 710048, China;
State Key Laboratory of Digital Manufacturing
Equipment and Technology,
Huazhong University of
Science and Technology,
Wuhan 430074, China
e-mail: yanjunlu@xaut.edu.cn

Yongfang Zhang

School of Printing,
Packaging Engineering and
Digital Media Technology,
Xi'an University of Technology,
Xi'an 710048, China
e-mail: zhangyf@xaut.edu.cn

Sha Li

School of Mechanical and
Precision Instrument Engineering,
Xi'an University of Technology,
Xi'an 710048, China
e-mail: 13379209867@163.com

Jianxiong Kang

School of Mechanical and
Precision Instrument Engineering,
Xi'an University of Technology,
Xi'an 710048, China
e-mail: Jianxiong_Kang@163.com

Norbert Müller

College of Engineering,
Michigan State University,
East Lansing, MI 48824
e-mail: mueller@egr.msu.edu

1Corresponding authors.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 3, 2017; final manuscript received June 1, 2018; published online July 24, 2018. Assoc. Editor: Stephen Boedo.

J. Tribol 141(1), 011701 (Jul 24, 2018) (16 pages) Paper No: TRIB-17-1466; doi: 10.1115/1.4040510 History: Received December 03, 2017; Revised June 01, 2018

The tribological performance of a compression ring-cylinder liner system (CRCL) is numerically studied. A thermal-mixed lubrication model is developed for the lubrication analysis of the CRCL with consideration of the cylinder liner deformation. An oil transport model coupled with a mass conservation cavitation algorithm is employed to predict the oil consumption and the transition between the fully flooded lubrication condition and starved lubrication condition. On this basis, the effects of the oil supply and cylinder liner deformation on the frictional characteristics are investigated under cold and warm engine conditions. The results show that the cylinder liner deformation and oil supply have great influence on the tribological performance of the CRCL. Better tribological performance and lower oil consumption can be obtained by reasonably controlling the oil supply.

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Figures

Grahic Jump Location
Fig. 1

Schematic diagram of the CRCL

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Fig. 2

Schematic diagram of a cylinder liner with fourth-order deformation

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Fig. 7

(a) Cylinder pressure and (b) compression ring velocity for the crankshaft speed of 2000 r/min

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Fig. 10

(a) Hydrodynamic friction under the cold engine condition, (b) hydrodynamic friction under the warm engine condition, (c) asperity friction under the cold engine condition, and (d) asperity friction under the warm engine condition for various oil film entry heights

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Fig. 12

(a) Oil film accumulations during the compression stroke under the cold engine condition, (b) oil film accumulations during the exhaust stroke under the cold engine condition, (c) oil film accumulations during the compression stroke under the warm engine condition, and (d) oil film accumulations during the exhaust stroke under the warm engine condition for various oil film entry heights

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Fig. 13

(a) Minimum oil film thicknesses under the cold engine condition and (b) minimum oil film thicknesses under the warm engine condition for various maximum deformations of cylinder liner

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Fig. 14

(a) Widths of oil lubrication zone under the cold engine condition and (b) widths of oil lubrication zone under the warm engine condition for various maximum deformations of cylinder liner

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Fig. 3

Heat transfer equations for the solids and the heat flux continuity equations at the oil-solid interfaces

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Fig. 16

(a) Power losses of the CRCL under the cold engine condition and (b) power losses of the CRCL under the warm engine condition for various maximum deformations of cylinder liner

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Fig. 4

(a) CRCL under starved lubrication and (b) CRCL under fully flooded lubrication

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Fig. 5

Schematic diagram of the oil transport model with front and back control volumes

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Fig. 6

(a) Simulation domain adopted in the validation and (b) comparison between oil film pressures obtained by the proposed model and Gu et al. model [42]

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Fig. 8

(a) Widths of oil lubrication zone under the cold engine condition and (b) widths of oil lubrication zone under the warm engine condition for various oil film entry heights

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Fig. 9

(a) Minimum oil film thicknesses of the CRCL under the cold engine condition and (b) minimum oil film thicknesses of the CRCL under the warm engine condition for various oil film entry heights

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Fig. 11

(a) Power losses of the CRCL under the cold engine condition and (b) power losses of the CRCL under the warm engine condition for various oil film entry heights

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Fig. 15

(a) Hydrodynamic friction under the cold engine condition, (b) hydrodynamic friction under the warm engine condition, (c) asperity friction under the cold engine condition, and (d) asperity friction under the warm engine condition for various maximum deformations of the cylinder liner

Grahic Jump Location
Fig. 17

(a) Oil film accumulations during the compression stroke under the cold engine condition, (b) oil film accumulations during the exhaust stroke under the cold engine condition, (c) oil film accumulations during the compression stroke under the warm engine condition, and (d) oil film accumulations during the exhaust stroke under the warm engine condition for various maximum deformations of the cylinder liner

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