Study on Frequency and Time Domain Analysis of Flow-Induced Vibration Response of Core Barrel

Guitao Cao, He Zhu, Guangdong Liu
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Abstract

Different calculation methods of flow-induced vibration of the reactor vessel internals (RVI) are studied in this paper, that is frequency domain analysis and time domain analysis. Firstly, considering the fluid-structure interaction between the core barrel (CB) and the reactor pressure vessel (RPV), the CB and the heavy reflector, the finite element model of the CB in water is established and the results of its vibration characteristics are obtained, which is consistent with the test results. Based on the flow-induced vibration test of the RVI scale model, the fluctuating pressure data of the CB is obtained. The parameters such as power spectral density (PSD), correlation length and coherence function are obtained by processing the test data. Thus, the cross-power spectral density between any two points is got through these parameters. The root mean square (RMS) response of the CB is obtained by random vibration analysis (frequency domain). Then, the CFD model is established and large eddy simulation (LES) is used to obtain the time history of the fluctuating pressure of the CB. The response of the CB is obtained by time integration method (time domain). The calculation results by using these two methods are in good agreement with the experimental results.
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岩心筒流激振动响应的频域和时域分析研究
本文研究了反应堆容器内部流激振动的不同计算方法,即频域分析和时域分析。首先,考虑堆芯筒与反应堆压力容器(RPV)、堆芯筒与重反射器之间的流固耦合作用,建立了堆芯筒在水中的有限元模型,得到了堆芯筒的振动特性分析结果,与试验结果一致;基于RVI比例模型的流激振动试验,获得了CB的脉动压力数据。通过对试验数据的处理,得到了功率谱密度、相关长度和相干函数等参数。通过这些参数可以得到任意两点间的交叉功率谱密度。通过随机振动分析(频域)得到了结构的均方根响应。在此基础上,建立CFD模型,采用大涡模拟(LES)方法,得到燃烧器脉动压力的时间历程;利用时间积分法(时域)得到了CB的响应。两种方法的计算结果与实验结果吻合较好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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