Abstract
Petal-shaped fuel rod encompasses a broad application prospect in sea-based nuclear power plants. A multi-scale coupled simulation is conducted based on natural circulation system with 3×3 petal-shaped fuel bundle channel. A multi-scale coupled model considering rolling motion is developed. Its reliability is verified by existing experimental data. The effect of rolling motion on the characteristics of natural circulation system is thoroughly discussed. The results indicate that if the start-up direction of rolling motion is the same as the direction of flow rate, rolling motion will lead to a sharp decrease in flow rate at the initial moment. By increasing rolling amplitude or decreasing rolling period will cause a significant increase in fluctuation amplitude of flow rate. Compared with the results under static condition, the fluid is subjected to the Coriolis force in the non-inertial coordinate system. This research can provide support for the joint optimization of natural circulation system.
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