VISCOSITY MODELS OF C60 FULLERENE MINERAL OILS AND COMPUTATIONAL FLUID DYNAMICS ON PISTON RING
Keywords:
Lubricants, fullerene C60, ageing, viscosity measurements.Abstract
To improve even more the efficiency in automotive engines, it is crucial to fully understand the generation of friction in its components. In recent years the usage of mineral and synthetic or semi-synthetic oils has increased. Nowadays worldwide massive research over nanoparticles and as a result nanolubricants has taken place. Results of research under laboratory conditions on the aging of engine commercial oils with different performance levels (such as mineral SAE 30, synthetic SAE 10W40) are presented in this paper. It is described that the action of pressure and temperature play a key role of the engine oils behaviour. The aging of lubricant causes changes to its dynamic viscosity. In this work an investigation was carried out using CFD simulations and piston ring-cylinder problem. The friction as well as the absolute pressure has been measured for all the crankshaft angles. The thermal problem has also been solved due to the fact that temperature variations affects on the oil viscosity. The temperature and the piston ring velocity varied according to the angle of the crankshaft.
