升功率工况下波动管热分层数值分析

Numerical Analysis of Surge Line Thermal Stratification Under Load Increasing Condition

  • 摘要: 以CPR1000稳压器波动管为研究对象,采用CFD方法,使用FLUENT软件,对反应堆功率增加瞬态工况下波动管热分层现象进行数值模拟研究,得到了波动管内热分层流体的流场和温度场分布,探讨了涡流效应对热分层分布的影响。结果表明:瞬态工况下波动管热分层与传统观念下的稳态热分层相比有很大不同,最显著的是T型三通区域,由于受到涡流效应的影响,流体热分层呈环形左右分布,而不再是稳态热分层的上下分布。本研究得到的瞬态工况下的温度分布结果可作为瞬态热应力分析的温度载荷,为后续的力学分析和疲劳分析奠定了基础。

     

    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.

     

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