Analysis of Turbulent Vibration Responses of Wire-Wrapped Fuel Rods in Lead-Bismuth Fluids

ZHANG Ke; WANG Yuancen; HUANG Qian; LIU Jian; ZHANG Yixiong; YU Xiaofei; QI Huanhuan

doi:10.21656/1000-0887.450123

Volume 46 Issue 6

Jun. 2025

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Article Navigation > Applied Mathematics and Mechanics > 2025 > 46(6): 730-741

ZHANG Ke, WANG Yuancen, HUANG Qian, LIU Jian, ZHANG Yixiong, YU Xiaofei, QI Huanhuan. Analysis of Turbulent Vibration Responses of Wire-Wrapped Fuel Rods in Lead-Bismuth Fluids[J]. Applied Mathematics and Mechanics, 2025, 46(6): 730-741. doi: 10.21656/1000-0887.450123

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Analysis of Turbulent Vibration Responses of Wire-Wrapped Fuel Rods in Lead-Bismuth Fluids

doi: 10.21656/1000-0887.450123

Analysis of Turbulent Vibration Responses of Wire-Wrapped Fuel Rods in Lead-Bismuth Fluids

Received Date: 2024-05-06
Rev Recd Date: 2024-11-01

Available Online: 2025-06-30

Abstract

Abstract

The density and viscosity of liquid lead-bismuth metal are much larger than those of water, which causes nonnegligible flow induced vibration (FIV) and wear problems of fuel assemblies in the reactor. With the fluid-structure coupled analysis method combining the CFD and the FEM, a rapid analysis method for the turbulent vibration responses of wire-wrapped fuel rods was proposed in view of the spatial periodicity and time periodicity. For the space periodic structure of wire-wrapped fuel rods, a single-span flow field model was established, and the lead-bismuth environment fluid excitation load was obtained based on the CFD analysis. From the frequency domain information of the turbulent excitation force PSD, the equivalent time history extrapolation technique was developed to obtain long-duration loads for vibration analysis. With the nonlinear contact between the wire-wrapped fuel rods considered, an FEM model was established to carry out the vibration analysis. The results show that, the axial flow of liquid lead-bismuth causes turbulent vibrations of fuel rods, with a maximum amplitude of 3.83 μm, which meets the engineering design requirement.
- wire-wrapped fuel rod,
- flow induced vibration,
- turbulent vibration,
- lead-bismuth fluid environment

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References

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