为了更加准确地研究发动机水套内冷却液流动传热问题,在 Mixture 多相流基础上建立了一套适用于发动机水套沸腾传热的气液两相流模型.以某直列4缸汽油机为研究对象,通过试验对汽油机第4缸火力面温度进行测量,两相流与传统单相流模拟结果对比表明两相流准确性更高.在两相流模拟结果基础上找出了汽油机水套壁面高温危险区,并基于发动机水套的设计要求提出了优化方案.模拟结果表明:优化后水套内冷却液的流动与冷却更加均匀,水套壁面温度明显降低,传热效果得到了提升.本研究可为以后的发动机沸腾传热研究和冷却水套设计提供参考.%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 j acket.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 j acket.
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