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报道了低压压水运行工况下自然循环系统中过冷沸腾引起的两相流流动稳定性研究结果。研究工作是在清华大学核能技术设计研究院的低温堆全尺寸、全参数热工水力学实验系统HRTL-5上进行的,采用了可视化研究与数据记录分析相结合的研究方法,研究了不同系统压力、不同进口过冷度条件下,加热段出口从单相流动、过冷沸腾,到低干度容积沸腾整个范围内自然循环系统的稳定性特征。研究发现了低压过冷沸腾自然循环不稳定现象。在较宽的过冷度范围内存在着多种不同模式的流量振荡,在特定条件下存在着自然循环流量静态漂移。研究结果对低压压水运行的自然循环系统,例如,壳式一体化自然循环供热堆和池式低温供热堆的热工设计和安全分析论证及启动方式研究都具有重要意义。
The results of the research on the flow stability of two-phase flow caused by subcooled boiling in a natural circulation system under low pressure and pressurized water operation conditions are reported. The research work was carried out on the HRTL-5, a full-scale, full-parameter thermodynamic and hydraulics experimental system for cryogenic reactor at Tsinghua University Institute of Nuclear Energy Technology Design and Research. The research methods of visualization and data recording and analysis were adopted. Pressure and different undercooling conditions, the stability of the natural circulation system in the whole range of outlet of the heating section from single-phase flow, subcooled boiling to low dry volume boiling. The study found that low pressure subcooled boiling instability natural circulation. There are many different modes of flow oscillations over a wide range of undercooling, under certain conditions there is a static drift of the natural circulation flow. The results of this study are of great importance to the research on the thermal design and safety analysis of natural circulation systems operating under LP PWR, for example, the shell-and-loop integrated natural circulation heating reactor and the chilled low temperature heating reactor.