CARR辐照压水堆小组件热工水力分析

摘要

T he thermal‐hydraulic behaviors of the PWR 4 × 4 small assembly tested in the high temperature and high pressure loop of China Advanced Research Reactor were analyzed .The CFD method was used to carry out 3D simulation of the model ,thus detailed thermal‐hydraulic parameters were obtained .Firstly ,the simplified model was simulated to give the 3D temperature and velocity distributions and analyze the heat transfer process .Then the whole scale small assembly model was simulated and the simulation results were compared with those of simplified rod bundle model .Its flow behavior was studied and flow mixing characteristics of the grids were analyzed ,and the mixing factor of the grid was calculated and can be used for further thermal‐hydraulic study .It is show n that the highest temperature of the fuel rod meets the design limit and the mixing effect of the grid is obvious .%分析压水堆4×4小组件在CARR高温高压回路中进行辐照考验时的热工水力问题。利用计算流体动力学（C FD ）软件对其进行三维数值模拟，以获得详细的热工水力参数。首先，模拟简化的燃料棒束模型，得出三维温度与速度分布，并分析了传热过程。然后，模拟全尺寸小组件，与棒束模型所得的结果进行对比分析，着重研究其流动，并分析了格架的搅混特性，得出可应用于一维热工水力程序的搅混因子。结果表明，燃料棒最高温度可满足安全性要求，且格架的搅混作用明显。