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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

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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