Nonlinear vibration of wire-wrapped fuel rod subjected to axial flow
Year: 2024
Type: article
Abstract: Wire-wrapped fuel rods are widely utilized in lead-bismuth reactors and subjected to high kinetic energy fluid flow, significantly influencing the reactor's safe operation. This study addresses the increasing interest in fuel assemblies by developing a theoretical fluid-structure interaction model to elucidate the dynamic behavior of wire-wrapped fuel rods. Newton's law is employed to derive the governing equation, with fluid force coefficients determined through widely accepted numerical simulations, while the impact and downstream nonlinear boundary condition are incorporated. Two comparative analyses robustly validate the reliability of the proposed model. Building on this model, the study investigates the nonlinear vibration characteristics (amplitude, phase space, impact forces, etc.) of the structure, considering the effects of gap size and streamlining parameter. Moreover, the theoretical derivation of this model provides a foundational and dependable mathematical framework to facilitate further research on fretting wear. • A complete theoretical description of the motion of wire wrapped fuel rod used in a lead-bismuth reactor. • The nonlinear boundary conditions including impact and streamlining parameter are considered. • Effects of impact gap and streamlining parameter on the nonlinear responses are provided.
Source: Alexandria Engineering Journal
Authors: Yu Zhang, Pengzhou Li
Institution: Nuclear Power Institute of China
Language: English
Subfield: Computational Mechanics
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,300
OpenAlex ID: W4404200090