A numerical model for predicting the wear of a piston ring/cylinder liner at the top dead center

Abstract

The cylinder liner-piston ring interface is a critical friction pair in diesel engines, and liner wear can significantly affect engine operation. This study proposes a numerical simulation model under variable operating conditions to quantitatively predict wear at the top dead center (TDC) of the liner, and verifies the model's accuracy. It reveals the influence patterns of engine speed, ambient temperature, and ambient pressure on cylinder liner wear. The research demonstrates good qualitative and quantitative agreement between the wear simulation model and experimental data, particularly with high precision near TDC. Further analysis shows that overall TDC wear depth increases with higher engine speeds. Specifically, wear at 1500 r/min is relatively lower compared to 1300 r/min. Moreover, TDC wear depth exhibits a trend of initially decreasing and then increasing with decreasing ambient pressure and increasing ambient temperature, reaching its minimum at 70 kPa pressure and 25°C temperature.