内燃机鼻梁区内过冷沸腾两相流研究

Two-Phase Heat Transfer Study in the Bridge Zone of Cylinder Head about Boiling Supercooled

为定量研究发动机冷却水腔内的过冷沸腾传热,以模拟通道内过冷沸腾试验为基础,采用欧拉多相流模型,确定了欧拉多相流模型的选用,将壁面温度分别取<400K、400K、>400K,得出最优沸腾模型适用范围;对比欧拉多相流模型、Mixture模型及单相流模型的计算精度,证实欧拉多相流具有更高计算精度,在绝大部分工况范围与试验数据对比误差低于10%,局部区域误差低于3%;证明湍流离散力在强迫对流过冷沸腾模拟中不可忽略。

In order to perform quantitative research on the heat transfer process of subcooled boiling inside cooling water cavity of engines, the current paper conducted a series of numerical simulations base on the experiment of subcooled boiling within a channel. The Eulerian multiphase model was employed and confirmed. Several wall temperature ranges （〈400 K, 400 K, 〉400 K） were discussed and the application condition of optimal boiling model was also obtained. By comparing the Eulerian multiphase model, the mixture multiphase model and the single-phase model, it＇s concluded that the Eulerian multiphase model possesses a higher accuracy. In most cases, the average errors are less than 10% and the local errors are no more than 3%, compared with the experimental data. It＇s indicated that the turbulent dispersion force plays an essential role in the numerical simulation of forced convection of the subcooled boiling.