Research Papers: Applications

The Effect of Cylinder Bore Distortion on Lube Oil Consumption and Blow-By

[+] Author and Article Information
Ozgen Akalin

Mechanical Engineering Department,
Istanbul Technical University,
Istanbul 34437, Turkey

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received July 7, 2012; final manuscript received July 10, 2013; published online October 3, 2013. Assoc. Editor: Robert L. Jackson.

J. Tribol 136(1), 011103 (Oct 03, 2013) (9 pages) Paper No: TRIB-12-1120; doi: 10.1115/1.4025208 History: Received July 07, 2012; Revised July 10, 2013

It is well known that cylinder bore deformations during engine operation cause a number of problems in piston ring lubrication. Particularly, the deterioration of piston ring and cylinder bore conformability results in a significant increase in lubricating oil consumption. Therefore, measurement and identification of cylinder bore distortion has been an important subject for engine designers. In this study, an analytical lubricating oil consumption model was developed for a diesel engine. Piston stiffness was identified as an important input parameter for the oil consumption model, and the stiffness matrix of the piston was calculated using finite element simulations. In addition, finite element analysis was performed to determine the distorted cylinder block shape in engine running conditions. Pressure curves and loads obtained in actual engine tests were used in the analysis. The Fourier coefficients of a distorted cylinder bore was calculated which characterize the deformed bore orders. Using these Fourier coefficients, several distorted bore shapes were regenerated, including a straight bore and the effect of each order on total lube oil consumption was investigated by means of the oil consumption model.

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Fig. 1

Power cylinder oil consumption mechanisms [7]

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Fig. 2

FEM model of the test rig

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Fig. 3

Simplified FEM model

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Fig. 4

Piston displacement results: (a) Simplified FEM model and (b) FEM model of test rig

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Fig. 5

Applied force locations on the piston [9]

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Fig. 6

Solid model of the engine assembly

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Fig. 7

Load types used in analysis

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Fig. 8

Engine block displacement results (top view, scaled 1000 times) (mm)

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Fig. 9

Engine block displacement results (side view, scaled 1000 times) (mm)

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Fig. 10

Distorted bore profiles: (a) Hot assembly and (b) cold assembly

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Fig. 11

Magnitudes of orders (hot assembly)

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Fig. 12

Magnitudes of orders (cold assembly)

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Fig. 13

Thermodynamic input data

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Fig. 14

Cylinder pressure input

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Fig. 15

Liner cases used in oil consumption simulations: (a) Distorted profile (scaled 300), (b) order 0 profile (scaled 150), (c) order 1 profile (scaled 150), (d) order 2 profile (scaled 400), (e) order 3 profile (scaled 500), and (f) order 4 profile (scaled 1500)

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Fig. 16

Oil consumption caused by evaporation (g/h)

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Fig. 17

Oil consumption caused by oil-blow (g/h)

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Fig. 18

Oil consumption caused by throw-off (g/h)

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Fig. 19

Total oil consumption (g/h)

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Fig. 20

Blow-by rate (l/min cycle)




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