矩形窄通道再淹没现象实验和数值研究  

Experimental investigation and CFD simulation of reflooding in narrow rectangle channel

作　　者：姬建业 许巍[1] 柴翔[1] 刘晓晶[1] 曾未[2] 

机构地区：[1]上海交通大学,上海200240 [2]中国核动力研究设计院,成都610041

出　　处：《核技术》2017年第1期67-74,共8页Nuclear Techniques

基　　金：国家自然科学基金(No.11275178)资助~~

摘　　要：在反应堆发生大破口事故时,再淹没阶段可以有效地降低燃料元件温度,防止堆芯熔毁。为了预测再淹没过程中板状燃料元件的换热特性,进行了竖直矩形窄缝通道底部再淹没过程的实验研究。针对实验工况,基于商用软件CFX,通过耦合分析加热板和流体的方法研究竖直矩形窄缝通道底部再淹没过程。通过将数值模拟结果与实验结果进行对比,评价了相关模型的适用性,并验证了计算流体动力学(Computational Fluid Dynamics,CFD)方法在预测再淹没过程的有效性。基于验证后计算模型,对壁面初始温度、入口流速对再淹没过程的影响进行了分析,获得了相关初始条件对壁面温度变化的影响规律。Background： Reflooding phenomenon plays an important role in nuclear reactor accident. During reflooding phase, the water level will rise from the bottom to the top with quenching the hot fuel rods, which is the most important phase to guarantee the integrity of cladding. Purpose： The aim is to predict the heat transfer in reflooding phenomenon and to investigate the initial conditions effect on the temperature variance. Methods： The experiments and numerical method were carried out to obtain the temperature variance. The THERMAL facility was built and the computational fluid dynamics （CFD） software CFX was used during the study. Results： The experiment data shows that the wall initial temperature has a big influence on the quench velocity and rewet temperature. After the comparison with the numerical simulation, the numerical model was validated. Through the numerical simulation, the relationship between inlet velocity and wall temperature was received. Conclusion： It can be concluded that the CFD method can be used to predict the heat transfer in reftooding phenomenon. And some of the heat transfer models need to be improved to improve the accuracy.

关 键 词：两流体模型 再淹没 矩形通道 流固耦合 

分 类 号：TL3[核科学技术—核技术及应用]