考虑排气冲刷的对置二冲程柴油机气缸套流固耦合传热

A fluid-solid coupled heat transfer simulation analysis of the cooling water-cylinder liner system in an opposed-piston two-stroke diesel engine was conducted based on the shear stress transport (SST) k-co turbulence model, incorporating the scouring boundary of the exhaust ports. The flow characteristics of the cooling water and the temperature distribution of the cylinder liner were investigated. The results show that strong exhaust gas scouring occurs at the exhaust ports, with heat transfer coefficients exceeding 600 W/(m2, K) in most regions. In addition, the flow velocity of the cooling water is relatively uniform within the water jacket but increases significantly near the exhaust port channels, reaching a maximum of 6.67 m/s. High-temperature zones are observed near the fuel injection holes on the inner wall of the cylinder liner and in the exhaust port regions, with temperatures reaching 665.7 K and 637.5 K, respectively. The temperature distribution exhibits a two-peak variation trend axially from the combustion chamber center toward both sides.