Abstract
Non-Newtonian engine lubricant and EHL film enhance engine life at small clearance in normal engine operation. It is not so in initial engine startup. This study models 2-D Maxwell viscoelastic hydrodynamic and EHL of piston skirts in initial engine startup. The 2-D Reynolds equation and the inverse solution technique are used for EHL solutions. Numerical solutions predict viscoelastic effects on piston eccentricities, hydrodynamic pressures and EHL films at different small radial clearances. Results are compared with Newtonian model, which suggest that viscoelasticity is beneficial for skirts lubrication at small radial clearances. Outcomes optimize small radial clearance in initial engine startup.
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