Abstract: A flow-induced vibration test study was conducted on the heat transfer tube bundle coiled in a longitudinal spiral shape in the core of a certain solution reactor, including the calculation and test of the vibration characteristics of the structure in air and still water, as well as the flow-induced vibration test under steady-state and transient operating conditions. The test results show that the pressure difference between the inlet and outlet of the heat transfer tube bundle increases with the increase of flow velocity, and the upper fixed connection end is a relatively weak part. Dynamic instability will not occur during steady-state operation, and the vibration displacement will not cause contact and collision between the tube sections of the tube bundle. Fatigue analysis shows that the requirements of the specification are met. The maximum vibration displacement and strain of the transient response are more than two orders of magnitude higher than those during steady-state operation. Keywords: solution reactor; spiral; heat transfer tube bundle; flow-induced vibration
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