A one-dimensional ring-pack lubrication model developed at MIT is applied to simulate the oil film behavior during the warm-up period of a Kohler spark ignition engine. This is done by making assumptions for the evolution of the oil temperatures during warm-up and that the oil control ring during downstrokes is fully flooded. The ring-pack lubrication model includes features such as three different lubrication regimes, i.e., pure hydrodynamic lubrication, boundary lubrication and pure asperity contact, nonsteady wetting of both inlet and outlet of the piston ring, capability to use all ring face profiles that can be approximated by piece-wise polynomials, and, finally, the ability to model the rheology of multigrade oils. Not surprisingly, the simulations show that by far the most important parameter is the temperature dependence of the oil viscosity.
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January 2001
Technical Papers
Analysis of the Piston Ring/Liner Oil Film Development During Warm-Up for an SI-Engine
K. Froelund,
K. Froelund
Department of Energy Engineering, The Technical University of Denmark, Lyngby, Denmark
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J. Schramm,
J. Schramm
Department of Energy Engineering, The Technical University of Denmark, Lyngby, Denmark
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T. Tian,
T. Tian
Sloan Automotive Laboratory, Massachusetts Institute of Technology, Cambridge, MA
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V. Wong,
V. Wong
Sloan Automotive Laboratory, Massachusetts Institute of Technology, Cambridge, MA
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S. Hochgreb
S. Hochgreb
Sloan Automotive Laboratory, Massachusetts Institute of Technology, Cambridge, MA
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K. Froelund
Department of Energy Engineering, The Technical University of Denmark, Lyngby, Denmark
J. Schramm
Department of Energy Engineering, The Technical University of Denmark, Lyngby, Denmark
T. Tian
Sloan Automotive Laboratory, Massachusetts Institute of Technology, Cambridge, MA
V. Wong
Sloan Automotive Laboratory, Massachusetts Institute of Technology, Cambridge, MA
S. Hochgreb
Sloan Automotive Laboratory, Massachusetts Institute of Technology, Cambridge, MA
Contributed by the Internal Combustion Engine Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received by the ICE Division, 23 April 1997; final revision received by the ASME Headquarters, 20 October 2000. Associate Editor: D. Assanis.
J. Eng. Gas Turbines Power. Jan 2001, 123(1): 109-116 (8 pages)
Published Online: October 20, 2000
Article history
Received:
April 23, 1997
Revised:
October 20, 2000
Citation
Froelund , K., Schramm, J., Tian , T., Wong , V., and Hochgreb, S. (October 20, 2000). "Analysis of the Piston Ring/Liner Oil Film Development During Warm-Up for an SI-Engine ." ASME. J. Eng. Gas Turbines Power. January 2001; 123(1): 109–116. https://doi.org/10.1115/1.1341206
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