Abstract
Heat exchanger tubes of steam generator in nuclear power plants are prone to damage and failure under long-term flow-induced vibration, which threatens the safe operation of reactors. In order to study the flow-induced vibration behavior of heat exchanger tubes, a single rigid cylinder was taken as the research object, based on large eddy simulation (LES), the HHT-α method was used to solve the structural dynamic equation, and combined with the local dynamic mesh deformation technology, the flow-induced vibration calculation model of heat exchanger tubes under transverse flow was established. Firstly, through the calculation of flow around a fixed cylinder with Re=3900, the influence of the grid discretization on the prediction ability of flow field characteristics was studied, and the CFD model suitable for the flow-induced vibration calculation was obtained. Secondly, the CSD model suitable for flow-induced vibration calculation is obtained by solving the structural dynamics equations with different methods. Finally, based on the established fluid-structure interaction calculation model of fluid-induced vibration of heat exchanger tubes, the vibration response characteristics, the motion trajectory and the wake mode of three-dimensional cylinder fluid-induced vibration at different reduced flow velocities were studied. The results show that the flow-induced vibration model of the heat exchanger tubes can accurately predict the flow-induced vibration behavior of a three-dimensional cylinder under transverse flow. The relevant research is of significance for reference to establish the flow-induced vibration calculation model of tube bundle structures under transverse flow.
