低干度自然循环流量漂移的特征曲线图谱分析  

Analysis of Characteristic Curves for Natural Circulation Flow Excursion at Low Steam Quality Conditions

作　　者：杨星团[1] 姜胜耀[1] 张佑杰[1] 

机构地区：[1]清华大学核能技术设计研究院先进反应堆工程与安全教育部重点实验室,北京100084

出　　处：《核动力工程》2006年第z1期47-52,共6页Nuclear Power Engineering

基　　金：国家自然科学基金委基金项目(10372050与50325620)资助

摘　　要：在5MW低温核供热堆全模拟试验回路(HRTL-5)上,实验观察到了低干度自然循环条件下的流量漂移现象。通过一个考虑了加热段欠热沸腾、上升段冷凝、闪蒸等物理过程的两相流动数学模型,编制了相应的计算程序,获得了自然循环特征曲线图谱及其运行曲线,确定了自然循环分岔图和静态不稳定边界图,进而提出了通过自然循环特征曲线图谱研究流量漂移的分析方法。分析表明:特征曲线图谱方法是研究自然循环静态不稳定的有效手段。增大系统压力、减小热流密度、增加入口单相阻力、减小出口两相阻力有利于避免自然循环流量漂移的发生。Natural circulation flow excursion has been observed on the test loop HRTL-5 under low steam quality conditions,which simulates the geometry and system design of the 5MW full power natural circulation Nuclear Heating Reactor.By means of a Four-Equations-Drift-Flux Model,which has considered the sub-cooled boiling,condensation and void flashing,the computational codes have been developed,from which the natural circulation characteristic curves and its operation curve have been obtained,and the bifur-cation curve and the static instability boundary have been determined.Therefore the Method of Characteristic Curves Analysis has been presented.Analytical results show that the Characteristic Curves Analysis Method is the effective approach to study the natural circulation static flow instability;Decreasing the heat flux or outlet two-phase resistance,and increasing the system pressure or inlet single-phase resistance are useful to avoid the natural circulation flow instability.

关 键 词：漂移流模型 两相流 自然循环 核供热堆 

分 类 号：TL33[核科学技术—核技术及应用]