压水堆燃料组件附加质量仿真研究

为了准确探究反应堆冷却剂与燃料组件间存在流固耦合行为对燃料组件振动特性的影响，本文采用计算流体动力学（CFD）软件Fluent平台，运用其中的动态网格技术，以压水堆燃料组件为研究对象，通过建立燃料组件模拟棒束、堆芯围板以及冷却剂模型，实现燃料组件与堆芯围板分别单独运动工况的燃料组件附加质量计算。结果显示：燃料组件运动工况下，燃料组件附加质量系数均值为2.4712；围板运动工况下，燃料组件附加质量系数均值为–3.4713，均与文献值偏差小于5%。叠加附加质量后，燃料组件振动频率计算值与水中振动试验测试结果偏差小于5%，验证了分析方法的合理性。本研究建立的仿真计算方法能够用于压水堆燃料组件附加质量计算。

Simulation Research on Additional Mass of PWR Fuel Assembly

In order to accurately explore the influence of fluid-structure interaction behavior between reactor coolant and fuel assembly on the vibration characteristics of fuel assembly, this paper takes the pressurized water reactor (PWR) fuel assembly as the research object, applies the computational fluid dynamics (CFD) software FLUENT platform and the dynamic mesh technology thereof and calculates the additional mass of fuel assembly under separate motion conditions of fuel assembly and core baffle by establishing the fuel assembly simulation rod bundle, core baffle and coolant model. The results show that the mean value of the fuel assembly's additional mass coefficient is 2.4712 under the fuel assembly motion condition and –3.4713 under the baffle motion condition, both with a deviation of less than 5% from the literature value. After superimposing of additional masses, the deviation between the calculated value of the fuel assembly vibration frequency and the underwater vibration test result is less than 5%, which verifies the rationality of the analysis method. The simulation calculation method established in this study can be used to calculate the additional mass of PWR fuel assembly.