A Semi-Empirical Approach for Modelling the Effect of Tube-Support Preload on Fluidelastic Instability of Tube Arrays

Abstract The purpose of this study is to develop a simplified semi-empirical model for characterizing the effect of tube support preloads on fluidelastic instability (FEI). Such a model is useful for a first order approximation of the onset for FEI of a tube bundle subjected to preload. A numerical model is used to generate data on FEI of tube arrays subjected to tube-support preloads. The numerical model uses the quasi-steady approach for modelling fluidelastic instability. Tube-support interaction at the loose supports is modelled using a combination of the Hertz contact model and force balance friction model. Effects of the support preload, tube-support impact, and friction are accounted for in the model. The numerical model is validated against experimental data, and then used to generate FEI threshold data. The results are then consolidated to produce a simplified semi empirical correlation for reproducing the effect of the tube support preload on the FEI behavior of a tube bundle. The formulation of the tube-support preload correlation is justified using a theoretical approach based on the Connors’ model.