Development of a refined helical fuel mixing model and application to a helical fuel rod bundle  

作　　者：FU JunSen XIAO Yao LI JunLong ZHANG Qi CONG TengLong GU HanYang 

机构地区：[1]School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Science China(Technological Sciences)》2023年第2期586-598,共13页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.12135008,12075150,and 12275174);the Shanghai Rising-Star Program (Grant No.22QA1404500);the Jingying Project of China National Nuclear Corporation。

摘　　要：Fuel assemblies have a decisive impact on the performance and safety of nuclear reactors.Helical fuel has huge potential for application in small module reactors(SMRs)due to its advantages in volume power density and safety.Typical helical fuel elements are usually trilobal or cruciform in cross-section.The fuel rods are helically twisted in the axial direction,eliminating the need for spacer grids as the fuel rods are self-supporting.In this paper,a refined subchannel division approach is proposed based on the crossflow mechanism of helical fuel assemblies.Then,a refined helical fuel mixing model framework,including the helical fuel distributed resistance method and directed crossflow method,is developed and implemented in a helical fuel rod bundle to investigate the mixing characteristics.Validation is provided by a 5×5 helical fuel bundle mixing experiment.The refined model predicts about 92.7%of the data with the±10%error range.Compared with existing helical fuel mixing models,the refined mixing model has higher axial accuracy and radial spatial resolution,and can accurately predict the twist angledependent crossflow rate and entry effect.Meanwhile,the refined helical fuel mixing model framework is universal and can be effectively used for the mixing prediction of arbitrary geometric helical fuel after the calibration of coefficients.

关 键 词：helical fuel CROSSFLOW flow sweeping mixing model refined subchannel method 

分 类 号：TM911.45[电气工程—电力电子与电力传动]