Abstract
► Performing the flow induced vibration experiment of the double-plate structure. ► Solving the measure difficulty of actual structure of the fuel assembly. ► Measuring the amplitude and frequency of the two plates by optical measurement. ► Founding a new mechanism of flow induced vibration. ► The vibration mechanism of the double-plate is similar to the single-plate structure. In addition, we found the synclastic movement and the reverse movement of the double plates. An experiment was carried out to research fluid–structure interaction (FSI) phenomenon on the parallel-plate fuel assembly. The parallel-plate fuel assembly was simplified as a double-plate structure installed in a narrow rectangular channel. In the experiment, the narrow-frequency, large-amplitude and opposite-phase vibrations and same-phase bends of two plates were observed in the different flow rate ranges. Compared with the behaviors found in the single-plate structure, some different characteristics were discovered.
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