【作者】 孙建闯； 曹夏昕； 边浩志； 成翔； 汪宇； 丁铭；

【Author】 Sun Jian-chuang;Cao Xia-xin;Bian Hao-zhi;Chen Xiang;Wang Yu;Ding Ming;Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University;Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China;

【机构】 哈尔滨工程大学核安全与仿真技术国防重点实验室； 中国核动力设计研究院核反应堆系统设计技术重点实验室；

【摘要】 由于浮动式核电站空间尺寸的限制,基于自然循环式的非能动安全壳热量导出系统的冷热源中心高度差通常较小,并且冷源为海洋环境。因此,工作介质中的不凝性气体是无法消除且持续存在的。然而,不凝性气体对这类自然循环流动特性的影响研究并不充分。本文对这类低高差开式自然循环系统中不凝性气泡的尺寸和频率进行了可视化实验研究,并详细分析了气泡行为对系统流动特性的影响。结果表明,在出口温度未饱和条件下,随着加热功率的增加,热管段内气泡的尺寸和频率均呈明显增加。此外,当热管段的流型为泡状流时,系统流动特性主要受气泡频率影响;当热管段的流型为塞状流时,系统流动特性主要受气泡尺寸的影响,并且最大振荡幅值可达平均流量的31%。更多还原

【Abstract】 Due to the limitation of space size of floating nuclear power plants, the height difference between the heat and cold sources of the passive containment heat removal system based on the form of natural circulation is usually small, and the cold source is usually the ocean. Therefore, the non-condensable gas could not be eliminated but always be in the working media. However, the influence of non-condensable gas on the flow characteristic of this type of natural circulation system is insufficient at present. Thus, a series of visualization experiments about the size and frequency of non-condensable bubbles are carried out based on the open natural circulation s ystem with low height difference, and the influence on natural circulation flow is analyzed in detail. The results show that the size and frequency of bubbles in the hot leg increase significantly with the increase of the heating power under unsaturated ou tlet temperature. In addition, when the flow pattern in the hot leg is bubble flow, the flow characteristics of the system are mainly affected by the bubble frequency; when the flow pattern in the heat pipe section is plug flow, the flow characteristics of the system are mainly affected by the bubble size, and the maximum oscillation amplitude can reach 31% of the average flow rate.更多还原