In the steam generator, the tube bundle is subjected to two-phase flow which also induces turbulent buffeting of the tube bundle. Due to the support and restraint of the anti-vibration bar on the tube bundle, the nonlinearity of the tube bundle vibration is determined. In this work, a nonlinear vibration characteristic caused by turbulence excitation between the tube bundle and the anti-vibration bars is presented. The accuracy of nonlinear vibration model will greatly affect the result of the nonlinear vibration analysis. Thus, the influence such as turbulent excitation force amplitude and support clearance on the vibration response of the tube bundles is researched by experiments. The turbulent excitation force is randomly generated by the two-phase flow turbulence bounding power spectral density (PSD) in the in-plane and out-of-plane directions, and the turbulent excitation force is loaded in the two directions of the tube. The turbulent excitation force amplitude changes from 0.4N to 3.2N. Support clearance changes from 0.025mm to 0.3mm. Then, an in-plane equivalent stiffness mechanical model and an out-of-plane equivalent spring-damping mechanical model of nonlinear support are proposed, and the calculation process of the relevant parameters are given. Finally, the numerical simulation results using the equivalent mechanical model are compared with that of the experimental results. The comparison results show the validity of theory model.


Research on Nonlinear Support Model Between Tubes and Anti-Vibration Bars in Steam Generators

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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