Abstract:
The numerical simulation of thermal stratification of the CPR1000 pressurizer surge line in the transient condition of load increasing by the FLUENT software with CFD method was presented. The flow field and temperature distributions were obtained. The effect of the vortex to thermal stratification was studied. The results show that thermal stratification in the transient condition is very different from the traditional steady condition. The most notably region is the T-junction area, and it has a ring around distribution, rather than the upper and lower distribution in the steady condition. The temperature distribution of this study can be used as the temperature load for transient thermal stress analysis, and also lay a solid foundation for the mechanical and fatigue analysis.