基于CFD的光滑棒束通道内超临界水传热特性及网格敏感性分析  

Analysis of heat transfer characteristics and grid sensitivity of supercritical water in smooth rod bundle channel based on CFD

作　　者：徐维晖[1] 翟禹鑫 王为术[1] 王杰[1] XU Weihui;ZHAI Yuxin;WANG Weishu;WANG Jie(Institute of Energy and Power Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)

机构地区：[1]华北水利水电大学能源与动力工程学院,河南郑州450045

出　　处：《中原工学院学报》2023年第1期73-81,共9页Journal of Zhongyuan University of Technology

基　　金：中原科技创新领军人才项目(224200510022)。

摘　　要：基于CFD对2×2光滑棒束通道网格模型多维度节点的敏感性进行分析研究,得到最佳网格参数,并以此为基础分析棒束通道内温度、速度场参数分布规律,探究光滑棒束通道内超临界流体的流态特征。结果表明,周向及径向网格节点数目对结果影响较大,r、θ、z三个方向节点数量分别控制在50个、120个、1 200个为最佳,第一层网格高度应控制在1.74μm。工况1条件下流体流速分布较为均匀,进出口流体温差、速度差要小于工况2,单根燃料棒周向温度中心侧要高于棒束外侧,以通道中心与棒束中心为中心面,温度逐级下降且呈对称分布。Based on the sensitivity analysis of CFD to the multi-dimensional nodes of 2 × 2 smooth rod bundle channel grid model, the optimal grid parameters are obtained, and the distribution law of temperature and velocity field parameters in the rod bundle channel is analyzed, the supercritical fluid flow characteristics in the smooth rod bundle channel are explored. The results show that the number of circumferential and radial grid nodes has a great effect. It is best to control the number of nodes in r, θ and z directions at 50,120,1 200 respectively, and the grid height of the first layer should be controlled at 1.74 μ m. Under condition 1, the distribution of fluid velocity are relatively uniform, and the temperature difference and velocity difference between the inlet and outlet is smaller than those in condition 2. The circumferential temperature center of a single fuel rod is higher than that outside the bundle. The temperature decreases step by step and shows a symmetrical distribution.

关 键 词：SCWR 网格敏感性 棒束通道 传热特性 

分 类 号：TK124[动力工程及工程热物理—工程热物理]