摇摆耦合升功率条件下一体化自然循环反应堆流动特性研究

Research on the flow characteristics of integrated natural ciculation reactor under rolling condition with rising power

为研究摇摆耦合升功率条件下一体化自然循环反应堆流动特性,建立自然循环典型三维分析模型,采用计算流体动力学(CFD)方法对摇摆条件下的自然循环进行了数值模拟,并针对不同升功率过程中的的速度和温度分布特性进行分析。结果表明:大幅升功率工况对应的温度和流量存在更为明显的“过冲”现象,摇摆强化了上升传热部件内部壁面换热热通量;在摇摆较为剧烈的条件下,下降段流道存在对于换热器出口冷流体显著的再热作用。

For the study on the flow characteristics of integrated natural ciculation reactor under rolling condition with Rising Power,natural circulation three-dimensional analysis model was established.The natural circulation under rolling condition was stimulated using computational fluid dynamics(CFD)method.The flow and temperature distribution are analyzed for different power raising processes.The results show that there is obvious overshoot phenomenon in the temperature and flow under the condition of large power increase.The heat transfer flux on the inner wall of the upward heat transfer unit is enhanced by rolling.The downdraft passage has a significant reheating effect on the cold fluid at the outlet of the heat exchanger under severe rolling condition.