This paper investigated the two-phase cross-flow-induced vibration of the tube bundles considering the effects of the tube support structure. A mathematical model of the tube bundles subjected to two-phase flow and the clearance restriction was developed. Based on this model, the vibration responses and bifurcation diagrams of the tube bundles in 20%, 40%, 60%, and 80% void fractions were calculated. The effects of the symmetric and asymmetric clearance restrictions on the nonlinear dynamics of the tube bundles were discussed. The results show that the two-phase flow void fraction has a great effect on the nonlinear dynamic characteristics of the tube bundles with clearance restriction. With increasing of the flow pitch velocity, the original equilibrium position could become unstable, and a new stable equilibrium will be generated within the four void fraction conditions. At the new stable equilibrium position, the nonlinear dynamics characteristics of the tube bundles system are much more complicated.

本文研究了考虑管支撑结构影响的管束两相横流引起的振动。开发了受两相流和间隙限制的管束的数学模型。基于该模型，计算了管束在20%、40%、60%和80%空隙率下的振动响应和分叉图。讨论了对称和非对称间隙限制对管束非线性动力学的影响。结果表明，两相流空隙率对具有间隙限制的管束的非线性动力学特性有很大影响。随着流动螺距速度的增加，原来的平衡位置可能变得不稳定，并且在四种空隙率条件下将产生一个新的稳定平衡。在新的稳定平衡位置，管束系统的非线性动力学特性更加复杂。