快堆燃料组件管脚开孔孔径选型水力实验研究  

Experimental Study on Diameter Selection for Entry-tube Hole of Fast Reactor Fuel Assembly

作　　者：秦亥琦 陆道纲[1,2] 唐甲璇 刘少华[1,2] 王嘉瑞 钟达文 QIN Haiqi;LU Daogang;TANG Jiaxuan;LIU Shaohua;WANG Jiarui;ZHONG Dawen(North China Electric Power University,Beijing 102206,China;Beijing Key Laboratory of Passive Nuclear Safety Technology,Beijing 102206,China)

机构地区：[1]华北电力大学核科学与工程学院,北京102206 [2]华北电力大学非能动核能安全技术北京市重点实验室,北京102206

出　　处：《核科学与工程》2019年第3期373-381,共9页Nuclear Science and Engineering

摘　　要：管脚位于快堆燃料组件入口处,其结构尺寸直接决定了进入燃料组件内部的冷却剂流量,对于燃料组件压力损失、流速分布等流体力学行为均有重要影响。目前关于燃料组件的相关研究多集中于棒束区热工流体力学特性,管脚段研究较为缺乏,且尚无明确的选型标准,故在工程实践之前,有必要进一步研究快堆燃料组件管脚的流体力学特性,完善选型标准,为结构设计提供参考。本文通过水力实验,研究了不同开孔孔径的燃料组件管脚对应阻力系数分布、流量与压降对应关系等流体力学性能。结果显示,管脚开孔孔径直接决定了冷却剂钠的质量流量与压降对应关系,可以通过改变管脚开孔孔径调节进入不同分区的燃料组件入口流量,使之具有大致相等的压降;本文引入了管脚收缩系数这一无量纲数,提出与管脚结构参数有关的阻力系数经验关系式,用于快堆燃料组件管脚阻力系数及压降的一般估算;基于设计要求的压降与开孔流速限值,本文给出了快堆燃料组件管脚开孔孔径选型推荐方案,供相关实验或工程参考。The entry tube locates at the coolant inlet of the fast reactor fuel assembly,which directly determines the flow rate of the sodium coolant entering the interior of the fuel assembly to cool the fuel-rod bundles. It has important influence on the pressure drop and flow-velocity distribution of the fuel assembly. At present,the research on fast reactor fuel assembly is mostly focused on the thermal-hydraulic characteristics of the fuel-rod bundles, while there is lack of the research about the entry tube,especially there is no uniform design standard. Therefore,it is necessary to further study the flow characteristics about the entry tube of fast reactor fuel assembly to provide a reference for structure design. In this study,the distribution of resistance coefficient and the relationship between flow rate and pressure drop of entry tube with different diameter are studied by hydraulic experiment. The results show that the diameter of the entry-tube hole has the significant impact on the flow characteristics of sodium coolant,so the inlet flow rate of the fuel assembly in different core-region can be adjusted by changing the diameter of the entry-tube hole to achieve the balance of pressure drop of fuel assembly. In addition,a dimensionless contraction coefficient of the entry tube is introduced and the empirical correlations of the resistance coefficient are formulated which are used to estimate the pressure drop of the in fast reactor fuel assembly. Finally,based on the design requirements of pressure drop and flow-velocity limitation,a recommended program is presented of diameter selection about the entry-tube hole,which can be used as a reference for relevant experiments or engineering.

关 键 词：快堆燃料组件 管脚开孔选型 水力实验 

分 类 号：TL352.1[核科学技术—核技术及应用]