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控制棒组件在事故工况下的落棒时间是保证核电站安全运行的重要参数之一。控制棒组件下落过程中弹性结构会与流体发生耦合作用并引起结构的横向振动,较大的横向振动位移会导致控制棒组件与导向管之间发生相互碰撞并影响落棒过程的计算。为了研究落棒过程中的流致振动及摩擦作用,本文将对落棒过程中的流体-结构横向耦合作用进行分析。首先将控制棒与导向管视为弹性体建立了流体-结构横向耦合振动方程,然后将流体力按性质分别进行计算,并考虑了不同导向管间的相互影响。结果表明落棒过程中的摩擦力并不为零,而且地震工况下的摩擦力较大。本文对落棒过程中的流体-结构耦合作用的分析是合理的,可为现有落棒分析模型起到进一步完善作用。
The falling time of the control rod assembly under the accident condition is one of the important parameters to ensure the safe operation of the nuclear power station. During the falling of the control rod assembly, the elastic structure will couple with the fluid and cause lateral vibration of the structure. Larger lateral vibration displacement will cause collision between the control rod assembly and the guide tube and affect the calculation of falling process. In order to study the flow-induced vibration and friction in the falling process, this paper will analyze the fluid-structure transverse coupling effect during the falling process. First, the control rod and the guide tube are regarded as the elastic body to establish the fluid-structure transverse coupling vibration equation, and then the fluid forces are calculated according to the nature separately, and the mutual influence among the different guide tubes is considered. The results show that the friction is not zero during the falling process, and the friction under seismic conditions is larger. In this paper, the analysis of the fluid-structure coupling effect during the falling process is reasonable and can be further improved for the existing falling process analysis model.