主催: The Japan Society of Mechanical Engineers
会議名: 第30回 原子力工学国際会議（ICONE30）
開催日: 2023/05/21 - 2023/05/26
Fluid elastic instability (FEI) is the most harmful excitation mechanism in flow-induced vibration. It is one of the important reasons related to the safety of reactor steam generator. In this paper, the FEI characteristics of regular triangular arrangement bundle and rotating regular triangular arrangement bundle with pitch-diameter ratio of 1.5 in water were studied experimentally. The results show that the critical reduced velocity of the regular triangular bundle is 3.0. The critical reduced velocity of the rotating triangular bundle is 1.7. In different stages of flow-induced vibration, the frequency spectrum characteristics of the vibration response of the rod bundle are significantly different. With the increase of reduced velocity, the vibration direction of the bundle changes from resistance direction to lift direction. It can be concluded that when the pitch-diameter ratio is the same, the regular triangle arrangement is more stable than the rotating regular triangle arrangement.
