1研究目的及研究意义自然循环及堆芯再淹没中两相流动传热行为研究是大型先进压水堆核电站重大专项中“反应堆堆芯及安全分析关键技术研究”课题的第一子课题。本课题针对大型先进压水堆中非能动余热排出热交换器自然循环过程及堆芯再淹没过程中的两相流动传热现象,开展理论和试验研究,研究物理机理,发展物理模型,获得设计和安全评审需要的数据,改进传热计算 1 research purposes and research significance of natural circulation and core re-submerged two-phase flow heat transfer behavior of large-scale advanced pressurized water reactor nuclear power station major project “reactor core and safety analysis of key technologies,” the first sub-topics . In this paper, aiming at the natural circulation process of non-active residual heat removal heat exchanger in large advanced PWR and the two-phase flow and heat transfer during core re-submerging, theoretical and experimental studies are carried out to study the physical mechanism, develop the physical model and obtain the design And safety review data needed to improve heat transfer calculations