基于CFD的绕丝元件棒束通道内流动传热特性研究  

Study on Flow and Heat Transfer Characteristics in the Rod Bundle Channel of the Wire-wrapped Fuel Based on the CFD

作　　者：高勇 程毅 崔军 李爽 邹旭毛 马蓓蓓 GAO Yong;CHENG Yi;CUI Jun;LI Shuang;ZOU Xumao;MA Beibei(China Nuclear Power Technology Research Institute Co.,Ltd,Shenzhen of Guangdong Prov.518000,China)

机构地区：[1]中广核研究院有限公司,广东深圳518000

出　　处：《核科学与工程》2024年第2期395-403,共9页Nuclear Science and Engineering

摘　　要：绕丝型燃料具有功率密度高、换热效果好等特点,相较于圆棒格架型燃料,能有效减小堆芯体积,实现反应堆紧凑布置。以四绕丝元件棒束通道内的流动传热特性研究对象,使用三维计算流体力学(Computational Fluid Dynamics,CFD)软件Fluent进行了数值模拟,主要研究绕丝螺距对流动传热特性的影响以及交混效应的特点。研究结果表明,随着绕丝螺距的减小,通道内的平均温度降低、压降增大;在绕丝作用下,通道间出现了明显的横向交混,横向交混随着绕丝螺距的增大而减弱;在对元件棒周向温度进行分析时发现热点主要集中在绕丝与元件棒的接触点附近,在进行热工安全分析时需要重点关注此处的传热恶化。Wire-wrapped fuel has several advantages,such as high power density,good heat transfer capability and others.Compared with the round-grid fuel,it can effectively reduce the core volume and realize compact reactor arrangement.The flow and heat transfer phenomena in a four-wire component bundle channel was studied by three-dimensional computational fluid dynamics software Fluent,and mainly focused on the influence of the wire pitch and the characteristics of the mixing effect.The results show that with the decrease of the wire pitch,the average temperature in the channel decreased and the pressure drop increased;under the action of wire winding,there is an obvious transverse mixing between channels,and the transverse mixing decreases with the increase of the wire winding pitch.When analyzing the circumferential temperature of the rod,it is found that the hot spot is mainly concentrated in the vicinity of the contact point between the wire winding and the rod,and the deterioration of local heat transfer should be paid attention to in the thermal safety analysis.

关 键 词：绕丝型燃料 CFD 子通道 

分 类 号：TL33[核科学技术—核技术及应用]