新型搅混翼对燃料棒流致振动导致的微动磨蚀影响研究  

Study on the influence of novel mixing vanes on fretting wear caused by fuel rods flow-induced vibration

作　　者：袁硕 柴翔 刘晓晶[1,2,3] 何辉 YUAN Shuo;CHAI Xiang;LIU Xiaojing;HE Hui(Country College of Smart Energy,Shanghai Jiaotong University,Shanghai 200240,China;School of Mechanical and Power Engineering,Shanghai Jiaotong University,Shanghai 200240,China;Shanghai Digital Nuclear Reactor Technology Intergration Innovation Center,Shanghai 200240,China)

机构地区：[1]上海交通大学智慧能源与创新学院,上海200240 [2]上海交通大学机械与动力工程学院,上海200240 [3]上海市数值反应堆技术融合创新中心,上海200240

出　　处：《核技术》2025年第3期163-171,共9页Nuclear Techniques

基　　金：国家自然科学基金(No.U20B2011,No.52176082);中国核工业集团公司领创研究项目。

摘　　要：针对由形状记忆合金制作的新型搅混翼的强化换热效果及其影响下的燃料棒微动磨蚀问题,利用双向流固热耦合的方法模拟了新型搅混翼下的流场分布、压降损失及燃料棒受力情况,并建立了燃料棒受力的非线性振动模型,计算了燃料棒相对于定位格架的微动磨蚀功率。结果表明:形状记忆合金搅混翼可不产生额外的压力损失而强化燃料棒与冷却剂间的传热;强化传热效果随着搅混翼的最大弯折角度的增大而增大;同时,燃料棒与定位格架间的微动磨蚀功率随着搅混翼的弯折角度增大而增大。[Background]Mixing vanes can enhance the critical heat flux of fuel assemblies by generating vortices.Current studies primarily focus on the optimized design of traditional mixing vanes made of zirconium alloy and does not take into account the impact of mixing vanes on fretting wear of fuel rods.[Purpose]This study aims to propose a novel type of mixing vane made of shape memory alloys to address the micro motion abrasion problem of fuel rods.[Methods]The two-way fluid-structure-thermal coupling analysis was employed to simulate the flow field distribution,pressure drop loss and fuel rod stress under a new type of mixing vane.Then,a nonlinear vibration model of fuel rod force with mixing vane made of shape memory alloys was established.Finally,a comparative analysis was conducted on the impact of different mixing vanes on the fretting wear power between fuel rods and the spacer grids.[Results]The results indicate that shape memory alloys mixing vanes experience a similar pressure loss compared to traditional mixing vanes;the enhanced heat transfer effect increases with the maximum bending angle of the mixing vanes.Simultaneously,the fretting wear power between fuel rods and the spacer grids increases with the bending angle of the mixing vanes.[Conclusions]Shape memory alloys mixing vanes do not generate additional pressure loss while strengthening heat transfer between fuel rods and coolant.

关 键 词：形状记忆合金 搅混翼 流致振动 微动磨蚀 计算流体力学 

分 类 号：TL99[核科学技术—核技术及应用]