In order to accurately study the heat transfer problem of the coolant flow in the engine water jacket

a gas liquid two phase flow model suitable for the boiling heat transfer in the engine water jacket was established on the basis of the mixture multiphase flow model. The temperature of the fourth cylinders fire surface was measured by a certain four cylinder gasoline engine

and the high accuracy of the two phase flow simulation was verified compared with the traditional single phase flow simulation. On this basis

the high temperature danger zone of the water jacket wall was found out

and the optimization scheme was proposed according to the design requirements of the engine water jacket. Results show that after optimization

the coolant flow and cooling are more uniform

the wall temperature of the water jacket is decreased and the heat transfer effect is also improved

which provides a reference for the future research on engine boiling heat transfer and the design of cooling water jacket.