In order to deeply study the mechanism and influencing factors of cavitation caused by the vibration of diesel engine wet cylinder liner

based on the steady-state numerical simulation of the coolant flow inside the water jacket to obtain the coolant pressure field and velocity field

the complete single cylinder water jacket was taken as the research object

and the six cylinder steady-state simulation results were extracted as the boundary conditions. Based on the multiphase flow model Mixture and the full-cavitation model Singhal

a gas-liquid two-phase flow simulation model for the numerical simulation of diesel engine coolant cavitation was established to carry out the transient numerical simulation of coolant cavitation. Results show that the pulse pressure of the coolant on the wall caused by vibration is the main cause of cylinder liner cavitation. The amplitude of the coolant pulse pressure increases with the wall vibration speed. The maximum pulse pressure appears at 6.75° when the vibration speed is the maximum. In a working cycle of the diesel engine

cavitation may occur on the main and secondary thrust side of the cylinder liner. And it is more likely to occur on the main thrust side. There are four areas on the main thrust side prone to cavitation

i.e. the upper middle

the top

the lower middle and the bottom from the greatest possibility to the lowest possbity of cavitation sorted by the amplitude of the pulse pressure on the wall. Finally

measures to reduce the risk of cavitation are proposed from the perspective of vibration suppression

cylinder liner surface modification and impulse pressure reduction.