In the normal low-speed engine operation, elastohydrodynamic lubrication (EHL) of piston skirts and lubricant rheology reduce friction and prevent wear. In a few initial start up cycles, a very low engine speed and absence of EHL cause adhesive wear. This study models hydrodynamic and EHL of piston skirts in the initial very low cold engine start up speed by using a high viscosity lubricant. The 2-D Reynolds equation is solved and inverse solution technique is used to calculate the pressures and film thickness profiles in the hydrodynamic and EHL regimes, respectively. The work is extended to investigate the effects of three very low initial engine start up speeds on the transverse eccentricities of piston skirts, film thickness profiles and pressure fields in the hydrodynamic and EHL regimes. Despite using a viscous lubricant, thin EHL film profiles are generated at low start up speeds. This study suggests very low speed optimization in the cold initial engine start up conditions to prevent piston wear under isothermal conditions.
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ASME/STLE 2011 International Joint Tribology Conference
October 24–26, 2011
Los Angeles, California, USA
Conference Sponsors:
- Tribology Division
ISBN:
978-0-7918-5474-7
PROCEEDINGS PAPER
Modeling Viscous Isothermal Piston Skirts EHL in Very Low Initial Engine Start Up Speeds
Syed Adnan Qasim,
Syed Adnan Qasim
National University of Sciences and Technology (NUST), Rawalpindi, Punjab, Pakistan
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M. Afzaal Malik
M. Afzaal Malik
National University of Sciences and Technology (NUST), Rawalpindi, Punjab, Pakistan
Search for other works by this author on:
Syed Adnan Qasim
National University of Sciences and Technology (NUST), Rawalpindi, Punjab, Pakistan
M. Afzaal Malik
National University of Sciences and Technology (NUST), Rawalpindi, Punjab, Pakistan
Paper No:
IJTC2011-61012, pp. 109-111; 3 pages
Published Online:
February 9, 2012
Citation
Qasim, SA, & Malik, MA. "Modeling Viscous Isothermal Piston Skirts EHL in Very Low Initial Engine Start Up Speeds." Proceedings of the ASME/STLE 2011 International Joint Tribology Conference. ASME/STLE 2011 Joint Tribology Conference. Los Angeles, California, USA. October 24–26, 2011. pp. 109-111. ASME. https://doi.org/10.1115/IJTC2011-61012
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