Study on the Stability of Rod Bundle Vibrating in Bounded Axial Flow

The mathematic models and the stability analysis method are established for analyzing flow induced vibration of rod bundles in bounded axial flow. As applications, the vibration characteristics and stability of a 4 rod system are studied. With the flow velocity incremental, the system experiences divergence instability and flutter instability. The existence of the axial flow induces the coupling of the movement of the rods. This coupling makes the very complicated vibration modes.