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TECHNICAL PAPERS: Internal Combustion Engines

Numerical Investigation of the Effects of Axial Cylinder Bore Profiles on Piston Ring Radial Dynamics

[+] Author and Article Information
Y. Piao, S. D. Gulwadi

Ricardo, Inc., 7850 Grant Street, Burr Ridge, IL 60527

J. Eng. Gas Turbines Power 125(4), 1081-1089 (Nov 18, 2003) (9 pages) doi:10.1115/1.1610016 History: Received June 01, 2002; Revised October 01, 2002; Online November 18, 2003
Copyright © 2003 by ASME
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References

Takiguchi, M., Watanabe K., Kato, T., Sato, M., and Ueno, H., 1999, “Effects of Piston Ring Tension on Oil Consumption and Piston Friction in Diesel Engines,” ASME ICE Spring Technical Conference, Vol. 32-3, Paper No. 99-ICE-199.
Hill, S. H., Kantola, T. C., Brown, J. R., and Hamelink, J. C., 1995, “An Experimental Study of the Effect of Cylinder Bore Finish on Engine Oil Consumption,” SAE Paper No. 950938.
Schneider, E. W., Blossfeld, D. H., Lechman, D. C., Hill, R. F., Reising, R. F., and Brevick, J. E., 1993, “Effect of Cylinder Bore Out-of-Roundness on Piston Ring Rotation and Engine Oil Consumption,” SAE Paper No. 93796.
Hitosugi, H. et al., 1996, “Study on Mechanism of Lubricating Oil Consumption Caused by Cylinder Bore Deformation,” SAE Paper No. 960305.
Goto, T., Arai, T., Goto, T., and Hamai, K., 1989, “Influence of Cylinder Bore Distortion on Engine Performances (Part 1: Static Mode Analysis of Bore Distortion for Amount of Oil Consumption,” JSAE Paper No. 891010.
Basaki, M., Saito, K., Nakashima, T., and Suzuki, T., 2000, “Analysis of Oil Consumption at High Engine Speed by Visualization of the Piston Ring Behaviors,” SAE Paper No. 2000-01-2877.
Gulwadi,  S. D., 1998, “A Mixed Lubrication and Oil Transport Model for Piston Rings Using a Mass-Conserving Algorithm,” ASME J. Eng. Gas Turbines Power, 120, pp. 199–208.
Gulwadi,  S. D., 2000, “Analysis of Tribological Performance of a Piston Ring Pack,” Tribol. Trans., 43-2, pp. 151–162.
Greenwood,  J. A., and Tripp,  J. H., 1971, “The Contact of Two Nominally Flat Rough Surfaces,” Proc. Inst. Mech. Eng., 185, pp. 625–633.
Piao, Y., and Gulwadi, S. D., 2000, “Effect of Piston Secondary Motion on the Numerical Modeling of Ring Pack Performance,” ASME-ICE Fall Technical Conference, ICE-Vol. 35-3, Paper No. 2000-342.

Figures

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Forces acting on a ring in the radial direction
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Schematic layout of a ring in an axially profiled bore
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Effect of axial bore profile on ring-liner clearance
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Baseline axial bore profile
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MOFT values for the ring-pack at 4000 rpm
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Top ring MOFT at different engine speeds
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Ring separation distance versus engine speed
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Peak values of piston acceleration versus engine speed
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MOFT of top ring in the intake stroke at 6000 rpm
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Oil flow rate below the ring face and gas flow rate through end gap of the top ring in the intake stroke at 6000 rpm
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Radial location of top ring face measured from the cylinder axis at different engine speeds during intake stroke
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Radial location of top ring face measured from the cylinder axis during intake and exhaust strokes at 6000 rpm
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Enlarged view of highlighted region in Fig. 12
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Effect of ring tension on radial location of top ring face during the intake stroke at 6000 rpm
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Top ring end gap sizes during intake and exhaust strokes for different tensions; (a) 9.39 N, (b) 12.21 N, and (c) 6.58 N at 6000 rpm
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“Ring separation distance” versus engine speeds for different values of top ring tension
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“Ring separation distance” versus top ring tension values for different engine speeds
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Various axial bore profiles used in this study  
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Radial location of top ring face during the intake and exhaust strokes while sliding over the “depression” in bore profile A at 6000 rpm
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Radial location of top ring face during the intake and exhaust strokes while sliding over the “bump” in bore profile B at 6000 rpm
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Measured cylinder bore deformation
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Measured ring end gap at 6000 rpm
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Ring separation from bore versus engine speed
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Ring separation from bore versus ring tension

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