Flow-induced vibration characteristics of novel segmented-design fuel rod
A finite element model(FEM)is established based on ANSYS-APDL and multi-span con-tinuous beam theory for a new novel segmented-design fuel rod(NSDFR).The FEM equivalent the fuel rod to a BEAM 4 element,the dimple and spring to a COMBIN 14 element.Subsequently,based on the mode data obtained from ANSYS-APDL and semi-empirical equations,the characteristics of turbulent excitation,flow instability,and vortex shedding are systematically studied,as soon as compared with traditional structures.Finally,the impact of grid failure on turbulent excitation,flow instability,and vortex shedding of fuel rods is evaluated.
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