Cavitation Failure Analysis of Cylinder Liner in Diesel Engines Caused by Increased Combustion Pressure

In this paper, a coupled modeling method considering cylinder liner vibration and coolant cavitation is proposed. The difference in coolant cavitation caused by combustion pressure variations is investigated. Based on a piston–cylinder liner transient dynamics model, the dynamic response of the liner under the piston slap is simulated and verified by bench test. Subsequently, the simulated vibrations are input into the flow field in the form of a dynamic mesh, and the pressure fluctuation and cavitation of the two diesel engines are investigated. The main causes of cavitation in the cylinder liner of high combustion pressure diesel engine are analyzed by combining experiments and numerical simulations. The results show that the main cause of cavitation is intensified vibration of the cylinder liner because of increased combustion pressure. The cavitation distribution in the axial direction is related to the modal properties of the cylinder liner.