From a tribology point of view, it is the two dead centers that are the main area of interest for experimental study of piston rings in large marine diesel engines. Therefore, in this work the performance of piston rings is studied to mark the importance of the two dead centers. A test rig based on a reciprocating principle was developed. Tribological parameters such as friction force, thickness of oil film and temperature variation of the piston ring bulk were studied as a function of crankshaft rotational speed, loading of the piston ring and two different types of lubricating oils. Dead loading was applied for each experiment. Selected results are presented for friction force, oil film thickness and temperature variation of the piston ring bulk as a function of crankshaft instantaneous position. Results are also compared for two different oils used in this study. Obtained results showed that the two dead centers have significant influence on the performance of piston rings under lubricated conditions. It can be concluded that at the dead centers the piston rings will experience a transition from dry friction to hydrodynamic friction with corresponding variation in rotational speed.
|Publication status||Published - 2009|
|Event||ASME/STLE International Joint Tribology Conference - Memphis, Tennessee, USA|
Duration: 1 Jan 2009 → …
|Conference||ASME/STLE International Joint Tribology Conference|
|City||Memphis, Tennessee, USA|
|Period||01/01/2009 → …|