Effect of Piston Secondary Motion on Lubricating Oil Consumption, Blow-by and Friction 2024-26-0259
As per pieces of literature, 40 to 60 % of friction losses of Internal combustion engines occur in their piston-piston rings-liner assemblies and, there is a significant supportive role of simulation in improving this assembly. Literature is also available which tells, how changes in pistons affect oil consumption. Thus, piston dynamics is also important for oil consumption. Furthermore, the results from the simulation module of piston movement also serve as a significant input for postprocessing to calculate piston ring dynamics.
This research is conducted to understand the piston secondary motion effect on oil consumption, friction, and blow-by. In this work, the results of ring dynamics and oil consumption simulation modules are studied with consideration and non-consideration of piston secondary motion results. The results like minimum oil film thickness, lubricating oil consumption, friction, friction power loss, and blow-by are investigated. Results indicate that oil throw-off and the top ring oil scraping occur when piston secondary motion is considered. Moreover, with piston secondary motion consideration, there is a significant rise in blow-by gases during the compression stroke and a marginal effect on friction power loss.
