3D EHD LUBRICATION AND WEAR FOR PISTON RING-CYLINDER LINER ON DIESEL ENGINES

다국어 초록 (Multilingual Abstract)

The three-dimensional EHD lubrication and wear loss of piston ring-cylinder liner components for five rings in the firing diesel engine was studied by using VC++ programs. The gas blowby, variable density and viscosity of lubricant, the surface roughness, friction heat flux and the normal elastic deformation are all considered in the EHD lubrication analysis algorithm. Meanwhile, the wear loss of the cylinder liner was also calculated when the diesel was started under cold starting condition in which the wearing was more serious than that in warm starting condition. The simulated results were compared with the wear measurement of the cylinder liner, and they matched well. It was found that the hydrodynamic friction force was larger than the asperity friction force, and the wear distribution of the barrel piston ring was very different from that of the rectangular piston ring. The distribution trend of the nominal oil film thickness was similar to the normal elastic deformation, but opposite to the wear loss of the piston rings. The wear loss caused by the first piston ring was the biggest and played a dominant role in the wear loss of cylinder liner. The greatest wear loss of the cylinder liner occurs at the time near top dead centre.

참고문헌 (Reference)

1 Yang, Q. M., "Two-dimensional piston ring lubrication-part I: rigid ring and liner solution" 39 (39): 757-768, 1996

2 Yang, Q. M., "Two-dimensional piston ring lubrication-Part II: elastic ring consideration" 39 (39): 870-880, 1996

3 Liu, K., "Two-dimensional lubrication study of the piston ring pack" 212 (212): 215-220, 1998

4 Ye, X. M., "Three-dimensional analysis of tribological performance and heat transfer in piston and cylinder liner system" 40 : 351-361, 2003

5 Michalski, J., "The effect of cylinder liner surface topography on abrasive wear of pistoncylinder assembly in combustion engine" 271 (271): 582-589, 2011

6 Ye, X. M., "Numerical investigation of the EHL performance and friction heat transfer in piston and cylinder liner system" 2004

7 J. CHOI, "NUMERICAL MODELING OF JOURNAL BEARING CONSIDERING BOTH ELASTOHYDRODYNAMIC LUBRICATION AND MULTI-FLEXIBLE-BODY DYNAMICS" 한국자동차공학회 13 (13): 255-261, 2012

8 Stark, M. S., "Measurement of lubricant flow in a gasoline engine" 19 (19): 163-168, 2005

9 Dhara, A., "Measurement of dynamic lubricating oil film thickness between piston ring and liner in a motored engine" 149 (149): 7-15, 2009

10 Qasim, S. A., "Low viscosity shear heating in piston skirts EHL in the low initial engine start up speeds" 44 (44): 1134-1143, 2011

11 Tamminen, J., "Influence of load on the tribological conditions in piston ring and cylinder liner contacts in a medium-speed diesel engine" 39 (39): 1643-1652, 2006

12 Jiang, Y. K., "Improvement of transient heat transfer models for the coupled 3-D moving piston assemblyliner system" 547-554, 2007

13 Cho, S. W., "Frictional modes of barrel shaped piston rings under flooded lubrication" 33 (33): 545-551, 2000

14 Livanos, G. A., "Friction model of a marine diesel engine piston assembly" 40 : 10-12, 2007

15 Kapsiz, M., "Friction and wear studies between cylinder liner and piston ring pair using Taguchi design method" 42 (42): 595-603, 2011

16 Johansson, S., "Experimental friction evaluation of cylinder liner/piston ring contact" 271 (271): 625-633, 2011

17 Charles, P., "Double-Newtonian rheology in a model piston-ring cylinder-wall contact" 43 (43): 1902-1907, 2010

18 Ma, M. T., "Development of a detailed model for piston-ring lubrication in IC engines with circular and non-circular cylinder bores" 30 (30): 779-788, 1997

19 Chong, W. W. F., "Cavitation induced starvation for piston-ring/ liner tribological conjunction" 44 (44): 483-497, 2011

20 Truhan, J. J., "A rig test to measure friction and wear of heavy duty diesel engine piston rings and cylinder liners using realistic lubricants" 38 (38): 211-218, 2005

21 Zhang, J. P., "3-D numerical simulation and experimental study on the wear of piston ring-cylinder liner" 1036-1039, 2010