基于两相流沸腾传热模型的缸盖温度场辨析

An Analysis on Thermal Load of Cylinder Head Based on Two-phase Flow Boiling Heat Transfer

为了更精确地研究发动机缸盖温度场的分布,在Eular多相流模型的基础上,结合Rohsenow核态沸腾传热模型,建立新的可用于内燃机缸盖水腔内过冷沸腾数值模拟的两相流模型.以某汽油机缸盖为研究对象,分别采用BDL和Rohsenow两种传热模型,利用CFD技术对其进行流固耦合传热计算和分析.结果表明,采用Rohsenow沸腾传热模型能够比BDL沸腾模型更精确地计算缸盖温度场;缸盖的最高温度192.22℃,最大应力156MPa,均满足缸盖材料的强度条件.

To study the temperature field distribution of engine cylinder head more precisely,based on the Euler multi-phase model,a new two-phase flow model combining the Rohsenow core boiling heat transfer model was established,which can be used for the numerical simulation of subcooled boiling.Ap-plying BDL and Rohsenow transfer models separately,the cylinder head fluid-solid coupling heat transfer system was simulated and analyzed with the CFD technology.The results have shown that the Rohsenow core boiling heat transfer model is more precise than the BDL model in calculating the temperature field of engine cylinder head.The highest temperature of the cylinder head is 1 92.22 ℃,and the maximum of stress is 235 MPa,both of which can meet the strength requirements of cylinder head materials.